Flavio Stochino's blog
https://imechanica.org/blog/27971
enReinforced Concrete Slab Optimization with Simulated Annealing
https://imechanica.org/node/23492
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span id="ember2058" class="ember-view"><span>I am glad to to share a new paper published on Applied Sciences. An optimization method, based on Simulated Annealing, is developed for the design of reinforced concrete slab. </span></span></p>
<p><span id="ember2058" class="ember-view"><span>Find out more at: </span></span><span id="ember2066" class="ember-view"><span><a href="https://www.mdpi.com/2076-3417/9/15/3161">https://www.mdpi.com/2076-3417/9/15/3161</a></span></span></p>
<p><span id="ember2066" class="ember-view"><span><a href="https://www.researchgate.net/publication/334964528_Reinforced_Concrete_Slab_Optimization_with_Simulated_Annealing">https://www.researchgate.net/publication/334964528_Reinforced_Concrete_Slab_Optimization_with_Simulated_Annealing</a></span></span></p>
<p><span id="ember2066" class="ember-view"><span><a href="https://www.academia.edu/40011194/Reinforced_Concrete_Slab_Optimization_with_Simulated_Annealing">https://www.academia.edu/40011194/Reinforced_Concrete_Slab_Optimization_with_Simulated_Annealing</a> </span><a id="ember2069" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23engineering" target="_self" data-control-name="update_hashtag"><span id="ember2070" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span></span></a></span></p>
<p><span id="ember2066" class="ember-view"><a id="ember2069" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23engineering" target="_self" data-control-name="update_hashtag"><span id="ember2070" class="hashtag-a11y ember-view" dir="ltr"><span>#</span><span class="hashtag-a11y__name">engineering</span></span></a> <a id="ember2073" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23research" target="_self" data-control-name="update_hashtag"><span id="ember2074" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">research</span></span></a> <a id="ember2077" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23structuralengineering" target="_self" data-control-name="update_hashtag"><span id="ember2078" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">structuralengineering</span></span></a> <a id="ember2081" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23concrete" target="_self" data-control-name="update_hashtag"><span id="ember2082" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">concrete</span></span></a> <a id="ember2085" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23reinforcedconcrete" target="_self" data-control-name="update_hashtag"><span id="ember2086" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">reinforcedconcrete</span></span></a> <a id="ember2089" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23structuraldesign" target="_self" data-control-name="update_hashtag"><span id="ember2090" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">structuraldesign</span></span></a></span></p>
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</div></div></div>Mon, 05 Aug 2019 06:33:31 +0000Flavio Stochino23492 at https://imechanica.orghttps://imechanica.org/node/23492#commentshttps://imechanica.org/crss/node/23492Robustness and Resilience of Structures under Extreme Loads
https://imechanica.org/node/23367
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/9646">resilience</a></div><div class="field-item odd"><a href="/taxonomy/term/2278">robustness</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span class="ember-view"><span><span><span>Many of modern life activities involve the risk of fire, explosions, and impacts. In addition, natural extreme events are becoming more and more common. us, robustness, the ability to avoid disproportionate collapse due to an initial damage, and resilience, the ability to adapt to and recover from the effects of changing external conditions, represent two important characteristics of current structures and infrastructures. eir definitions are reviewed in this paper with the aim of sorting and describing the different approaches proposed in the literature and in the international standards. A simple example is also analysed in order to </span></span></span></span><span class="ember-view"><span><span><span>compare different methods.</span></span></span></span></p>
<p> </p>
<p><span class="ember-view"><img src="///Users/flaviostochino/Downloads/0001.jpg" alt="Resilience " width="399" height="565" /></span></p>
<p> </p>
<p><span id="ember1768" class="ember-view"> </span><a id="ember1772" class="feed-shared-text-view__hyperlink ember-view" href="https://lnkd.in/dWit2YZ" target="_blank" rel="noopener noreferrer">https://lnkd.in/dWit2YZ</a><span id="ember1776" class="ember-view"> </span></p>
<p><a id="ember1780" class="feed-shared-text-view__hyperlink ember-view" href="https://lnkd.in/d5E4QTX" target="_blank" rel="noopener noreferrer">https://lnkd.in/d5E4QTX</a><span id="ember1784" class="ember-view"> </span></p>
<p><a id="ember1788" class="feed-shared-text-view__hyperlink ember-view" href="https://lnkd.in/dPk6G3C" target="_blank" rel="noopener noreferrer">https://lnkd.in/dPk6G3C</a><span id="ember1792" class="ember-view"> </span></p>
<p> </p>
<p><span id="ember1792" class="ember-view"><a id="ember1795" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23engineering" target="_self" data-control-name="update_hashtag"><span id="ember1796" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">engineering</span></span></a> <a id="ember1799" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23robustness" target="_self" data-control-name="update_hashtag"><span id="ember1800" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">robustness</span></span></a> <a id="ember1803" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23resilience" target="_self" data-control-name="update_hashtag"><span id="ember1804" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">resilience</span></span></a> <a id="ember1807" class="hashtag-link ember-view" href="https://www.linkedin.com/feed/hashtag/?keywords=%23structural" target="_self" data-control-name="update_hashtag"><span id="ember1808" class="hashtag-a11y ember-view" dir="ltr"><span class="visually-hidden">hashtag</span><span>#</span><span class="hashtag-a11y__name">structural</span></span></a></span></p>
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</div></div></div>Sat, 15 Jun 2019 15:40:37 +0000Flavio Stochino23367 at https://imechanica.orghttps://imechanica.org/node/23367#commentshttps://imechanica.org/crss/node/23367Numerical insights on the structural assessment of historical masonry stellar vaults: the case of Santa Maria del Monte in Cagliari
https://imechanica.org/node/23140
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2996">masonry</a></div><div class="field-item odd"><a href="/taxonomy/term/8869">Advanced FEM</a></div><div class="field-item even"><a href="/taxonomy/term/4834">Genetic Algorithm</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>New Paper: "Numerical insights on the structural assessment of historical masonry stellar vaults: the case of Santa Maria del Monte in Cagliari" Enjoy this free version of the paper!</p>
<p> </p>
<p><a href="https://rdcu.be/bpvX0">https://rdcu.be/bpvX0</a></p>
<p> </p>
<p>The aim of this paper is to present an in-depth numerical investigation on the statics of historical masonry stellar vaults, a special class of masonry ribbed vaults whose three-dimensional geometry features a star-shaped projection on the horizontal plane. In particular, the mechanical behavior of the masonry stellar vault belonging to the church of Santa Maria del Monte in Cagliari (Italy) is analyzed and illustrated as an especially meaningful case study. This church, which was built during the second half of the sixteenth century, is a beautiful example of Gothic-Catalan style, and its ribbed stellar vault is one of the most representative of this type in the town of Cagliari. The geometric outline of the vault has been obtained through laser scanning techniques and a procedure of reverse engineering. Starting from a three-dimensional representation of its geometry, the ultimate load-bearing capacity of the stellar vault can be accurately estimated through a recently developed, NURBS-based upper-bound limit analysis scheme. A comparison with incremental nonlinear analyses carried out with the commercial finite element code DIANA is presented. Furthermore, <span>the paper also includes a sensitivity study aimed at investigating the role of ribs on the ultimate load-bearing capacity of the structure.</span></p>
</div></div></div>Tue, 05 Mar 2019 13:05:33 +0000Flavio Stochino23140 at https://imechanica.orghttps://imechanica.org/node/23140#commentshttps://imechanica.org/crss/node/23140A refined assumed strain finite element model for statics and dynamics of laminated plates
https://imechanica.org/node/22698
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1251">finite elements</a></div><div class="field-item odd"><a href="/taxonomy/term/12225">Laminated plates</a></div><div class="field-item even"><a href="/taxonomy/term/12226">Mixed assumed strain</a></div><div class="field-item odd"><a href="/taxonomy/term/7561">Computational Mechanics and Materials</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span><span>This work discusses some alternate models of a mixed assumed strain finite element which has been developed for laminated plates. After a brief theoretical review about this kind of plates and their possible finite element formulation, specifically devised for predicting the mechanical behavior of such structures, we discuss four possible assumptions for strains generating four kinds of mixed assumed strain finite elements. Several numerical tests performed on the aforementioned finite elements are thoroughly discussed in order to sketch some guidelines which can be useful when dealing with laminated plate problems.</span></span></p>
<p> </p>
<p><a id="ember8398" class="ember-view" href="https://lnkd.in/dF-RCHi" target="_blank">https://lnkd.in/dF-RCH</a></p>
</div></div></div>Sat, 29 Sep 2018 06:56:06 +0000Flavio Stochino22698 at https://imechanica.orghttps://imechanica.org/node/22698#commentshttps://imechanica.org/crss/node/22698Robustness and Resilience of Infrastructures under Extreme Loads
https://imechanica.org/node/22036
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>The catastrophic consequences observed after extreme events (flooding, earthquakes, vehicle impact, explosions, and fire) in transport and energy networks, as well as commercial and residential buildings, have significantly changed the public perception of risk regarding structures and infrastructure. Materials and structures are pushed to the limit in these conditions and given the fact that it is not always possible to provide an elastic response damage development must be considered and robustness becomes a precious characteristic. Robustness of a system has been often described as the capacity to resist local failure without causing disproportionate collapse. Though quite simple from a qualitative point of view the quantification of this concept represents a current open problem for engineers. Indeed, several different approaches have been proposed but there is not an ultimate solution. After an extreme event refurbishments and restoration are often compared to the complete reconstruction of the damaged structures. The resilience of built infrastructure represents the ability to recover from an extreme event in terms of both safety and serviceability. A quantitative definition of resilience represents another important problem for civil engineers and urban planners.</p>
<p> </p>
<p>We invite authors to submit original research and review articles that investigate the robustness and resilience of infrastructure from a quantitative point of view.</p>
<p> </p>
<p>Potential topics include but are not limited to the following:</p>
<p> </p>
<p>Structural and nonstructural robustness</p>
<p>Resilience design</p>
<p>Structural response under extreme loads</p>
<p>Earthquake and seismic loads on structures</p>
<p>Blast and impact loads on structures</p>
<p>Fire design and fire structural response</p>
<p>Authors can submit their manuscripts through the Manuscript Tracking System at <a href="https://mts.hindawi.com/submit/journals/ace/rrie/">https://mts.hindawi.com/submit/journals/ace/rrie/</a>.</p>
<p> </p>
<p>Submission DeadlineFriday, 11 May 2018</p>
<p>Publication DateSeptember 2018</p>
<p>Papers are published upon acceptance, regardless of the Special Issue publication date.</p>
</div></div></div>Sat, 13 Jan 2018 23:24:51 +0000Flavio Stochino22036 at https://imechanica.orghttps://imechanica.org/node/22036#commentshttps://imechanica.org/crss/node/22036Low cost condition assessment method for existing RC bridges
https://imechanica.org/node/22035
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2970">Structural Engineering</a></div><div class="field-item odd"><a href="/taxonomy/term/4681">Reinforced concrete</a></div><div class="field-item even"><a href="/taxonomy/term/11908">Condition Assessment</a></div><div class="field-item odd"><a href="/taxonomy/term/11909">Degraded Materials</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p id="sp0095">Aging infrastructures represent a current engineering challenge. Huge budgets are necessary to keep their functionality and the lack of a proper and timely maintenance entails an increasing deterioration and therefore higher repair costs. Therefore, assessing the reliability of infrastructures becomes mandatory, with particular attention to the ones still in service even when their life limit has exceeded.</p>
<p id="sp0100">This paper aims to propose a new, fast and low cost method of condition rating for reinforced concrete bridges. This is based on visual inspection and non-destructive testing.</p>
<p id="sp0105">The main innovation is represented by the parameters taking into account the mechanical degradation of materials and the damage location at the structural sub-component level.</p>
<p id="sp0110">The analysis of some benchmark examples and the comparison with other methods are presented in order to assess the reliability of the new proposal.</p>
<p><span><a href="https://www.sciencedirect.com/science/article/pii/S1350630717311457">https://www.sciencedirect.com/science/article/pii/S1350630717311457</a></span></p>
<p><span><a href="https://www.researchgate.net/publication/322068162_Low_cost_condition_assessment_method_for_existing_RC_bridges">https://www.researchgate.net/publication/322068162_Low_cost_condition_as...</a></span></p>
<p><span><a href="https://www.academia.edu/35660091/Low_Cost_condition_assessment_method_for_existing_RC_bridges">https://www.academia.edu/35660091/Low_Cost_condition_assessment_method_f...</a></span></p>
</div></div></div>Sat, 13 Jan 2018 23:21:26 +0000Flavio Stochino22035 at https://imechanica.orghttps://imechanica.org/node/22035#commentshttps://imechanica.org/crss/node/22035Eigenerosion for static and dynamic brittle fracture
https://imechanica.org/node/21507
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/11744">eigenerosion</a></div><div class="field-item odd"><a href="/taxonomy/term/32">fracture mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/3182">concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/2970">Structural Engineering</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>In contrast to many numerical methods, the eigenerosion approach yields a convenient description of fracture handled in the postprocessing part of a Finite Element Analysis (FEA). Its fully energetic formulation avoids the introduction of extra degrees of freedom to model fracture propagation. Following previous works on eigenerosion, in this publication, a modified formulation of eigenfracture it is introduced, where it is distinguished between compression and tension loaded state. This formulation has the advantage that it relates the crack propagation process only to tensile loading. The procedure is implemented using a spectral decomposition of the strain field. The application of the method to brittle fracture makes it suitable for materials like concrete. The accuracy of the method is assessed for linear elasticity in statics and dynamics for two- and three-dimensional problems.</span></p>
<p> </p>
<p><span><a href="http://www.sciencedirect.com/science/article/pii/S0013794417302989">http://www.sciencedirect.com/science/article/pii/S0013794417302989</a></span></p>
<p><span><a href="https://www.researchgate.net/publication/317724499_Eigenerosion_for_static_and_dynamic_brittle_fracture">https://www.researchgate.net/publication/317724499_Eigenerosion_for_stat...</a></span></p>
</div></div></div>Mon, 14 Aug 2017 15:37:02 +0000Flavio Stochino21507 at https://imechanica.orghttps://imechanica.org/node/21507#commentshttps://imechanica.org/crss/node/215076th International Workshop on Design for Civil and Environmental Engineering
https://imechanica.org/node/21373
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1117">design</a></div><div class="field-item odd"><a href="/taxonomy/term/1044">engineering</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Design means to analyze, compare, manage and connect a large amount of data in order to develop, expand and materialize the starting idea, which was born to solve the initial problem. In this process, the engineer is the bridge of connection between the creative moment and its real implementation. The Design in Civil and Environmental Engineering (DCEE) series of workshops explore what it would mean for design to be a discipline within Civil and Environmental Engineering and the implication for interdisciplinary design in corporation with other fields such as Architecture, Urban Planning, Topography and more. We are pleased to invite you in Cagliari (Italy – Sardinia) to the 6th International Workshop on Design for Civil and Environmental Engineering where we will explore the nature of design in civil and environmental engineering and establish the foundation for civil design research.</p>
<p>You are also cordially invited to submit a paper for the 6th International Workshop on Design in Civil and Environmental Engineering. Original research papers, educational and professional case studies, and editorial essays are all welcome. Papers must be original, unpublished, and written in English. Abstracts and papers will be reviewed by the International Advisory Committee. Authors will be notified of the results via email. The abstracts should be written in English and must not exceed 250 words. Abstracts should be submitted by e-mail as PDF files to <a href="mailto:secretariat@dcee2017.org">secretariat@dcee2017.org</a> Peer-review accepted papers will be published in the DCEE 2017 Proceedings and will also be available in electronic form, with a proper DOI.</p>
<p>The most valuable articles will be selected and recommended for publication, in the extended form, in Special Issues of highly reputable journals, such as:</p>
<p>• Engineering, Construction and Architectural Management <a href="http://www.emeraldgrouppublishing.com/products/journals/journals.htm?id=ecam">http://www.emeraldgrouppublishing.com/products/journals/journals.htm?id=...</a></p>
<p>• International Journal of Structural Glass and Advanced Materials Research <a href="http://thescipub.com/journals/sgamr/cfp/49209">http://thescipub.com/journals/sgamr/cfp/49209</a></p>
<p>At least one author of each accepted paper is expected to register and present the paper.</p>
<p><a href="mailto:secretariat@dcee2017.org">secretariat@dcee2017.org</a></p>
<p><a href="http://www.dcee2017.org/">http://www.dcee2017.org/</a></p>
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</div></div></div>Tue, 04 Jul 2017 08:52:39 +0000Flavio Stochino21373 at https://imechanica.orghttps://imechanica.org/node/21373#commentshttps://imechanica.org/crss/node/21373International Journal of Structural Glass and Advanced Materials Research (IJSGAMR)
https://imechanica.org/node/21136
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3015">civil engineering</a></div><div class="field-item odd"><a href="/taxonomy/term/3269">Announcement of a new journal</a></div><div class="field-item even"><a href="/taxonomy/term/861">glass</a></div><div class="field-item odd"><a href="/taxonomy/term/2970">Structural Engineering</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>Dear all,</span></p>
<p><span> the</span> <span><span>International Journal of Structural Glass and Advanced Materials Research (IJSGAMR) is a peer-reviewed, open access journal which covers all aspects of theoretical and practical research of materials science.</span></span></p>
<p> </p>
<p><span><span>The journal aims to promote international exchange of knowledge and broad discussion on advancements, outcomes and recent developments in materials research for civil engineering applications. In this regard, careful consideration is paid especially for theoretical, experimental and numerical investigation on novel solutions, including structural glass as well as hybrid systems, fiber-reinforced pultruded composites, laminates, polymers, shape memory alloys.</span></span></p>
<p><span><span>Coverage also includes (but is not limited to):</span></span></p>
<p><span><span>- design philosophy & safety concepts;</span></span></p>
<p><span><span>- extreme loading conditions;</span></span></p>
<p><span><span>- strength and stability;</span></span></p>
<p><span><span>- structural innovation;</span></span></p>
<p><span><span>- sustainability and architectural aspects;</span></span></p>
<p><span><span>- thermal performance of civil engineering materials;</span></span></p>
<p><span><span>- fabrication techniques relevant to the application of advanced materials as load-bearing components or assemblies in buildings.</span></span></p>
<p><span><span>The journal aims to serve as an effective platform and key resource for the promotion of scientific exchange between academic scientists, professional engineers, designers.</span></span></p>
<p><span><span>In this regard, International Journal of Structural Glass and Advanced Materials Research publishes high-quality research, including full-length original papers, as well as review articles, case studies, technical notes and short research letters. To this aim, all papers are subjected to blind review process by a distinguished team of international experts.</span></span></p>
<p><span><span>Submissions are open and publication fee is waived for this year.</span></span></p>
<p><span><span><span><a href="http://thescipub.com/journals/sgamr/">http://thescipub.com/journals/sgamr/</a></span></span></span></p>
<p> </p>
<p> </p>
</div></div></div>Mon, 10 Apr 2017 22:15:22 +0000Flavio Stochino21136 at https://imechanica.orghttps://imechanica.org/node/21136#commentshttps://imechanica.org/crss/node/21136A simplified model for railway catenary wire dynamics
https://imechanica.org/node/21050
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2970">Structural Engineering</a></div><div class="field-item odd"><a href="/taxonomy/term/6340"># Finite Element modeling</a></div><div class="field-item even"><a href="/taxonomy/term/11578">dynamics of taut cables</a></div><div class="field-item odd"><a href="/taxonomy/term/11579">railway installation optimisation; modal analysis; analytic model; continuous elastic support</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>In this paper, a simplified analytic model for the dynamic behaviour of railway catenary wire is presented. The model is discussed and validated with the help of numerical results obtained by a finite element code, for the case of a typical Italian railway installation. The simplified model is convenient from the computational point of view and is useful for sensitivity analysis. Some parametric studies have been developed by considering as free parameters the velocity and the distance of the train pantographs and looking at their effect on catenary dynamics.</p>
<p><a href="http://dx.doi.org/10.1080/19648189.2016.1245631">http://dx.doi.org/10.1080/19648189.2016.1245631</a></p>
<p><a href="https://www.researchgate.net/publication/309437324_A_simplified_model_for_railway_catenary_wire_dynamics">https://www.researchgate.net/publication/309437324_A_simplified_model_fo...</a></p>
<p><a href="https://www.academia.edu/31976918/A_simplified_model_for_railway_catenary_wire_dynamics">https://www.academia.edu/31976918/A_simplified_model_for_railway_catenar...</a></p>
</div></div></div>Wed, 22 Mar 2017 08:17:26 +0000Flavio Stochino21050 at https://imechanica.orghttps://imechanica.org/node/21050#commentshttps://imechanica.org/crss/node/21050Recycled Concrete Slabs: excellent punching performance!
https://imechanica.org/node/20426
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/4681">Reinforced concrete</a></div><div class="field-item odd"><a href="/taxonomy/term/11356">Punching</a></div><div class="field-item even"><a href="/taxonomy/term/11357">Recycled Materials</a></div><div class="field-item odd"><a href="/taxonomy/term/11358">Recycled Concrete</a></div><div class="field-item even"><a href="/taxonomy/term/2970">Structural Engineering</a></div><div class="field-item odd"><a href="/taxonomy/term/3015">civil engineering</a></div><div class="field-item even"><a href="/taxonomy/term/4574">experimental data</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><img src="http://imechanica.org/files/fig2.jpg" alt="" width="396" height="402" /></p>
<p>This paper reports on the experimental assessment of the punching shear behaviour of reinforced recycled concrete slabs characterized by fine natural aggregates and coarse recycled aggregates. In particular, the latter were obtained only from demolished concrete. The experimental campaign has been carried out on 12 specimens. Moreover, three reinforced natural aggregate concrete slabs have been casted and tested as benchmarks. Four replacement percentages (30, 50, 80 and 100%) of coarse recycled aggregates in place of coarse natural aggregates have been considered. The punching shear behaviour of simply supported reinforced recycled concrete slabs under a central patch load has been investigated by means of failure patterns, ultimate loads and deflection–load curves.</p>
<p>Moreover, comparisons and a review of international code models for slabs under punching shear have been developed. The results show a reduction in recycled concrete mechanical performance with increasing replacement percentage of natural aggregate with coarse recycled aggregates. However, the reduced recycled concrete performance does not translate directly to the punching shear strength of reinforced recycled concrete slabs; indeed, the punching forces of all recycled concrete slabs tested are very similar to those of slabs realized with ordinary reinforced concrete. Actually, although the theoretical models on the punching shear are based on the characteristics of the concrete, this study indicates that the reinforcement role is of paramount relevance.</p>
<p><a href="https://www.academia.edu/29020772/Punching_shear_strength_of_reinforced_recycled_concrete_slabs">https://www.academia.edu/29020772/Punching_shear_strength_of_reinforced_...</a></p>
<p><span><a href="https://www.researchgate.net/publication/308924360_Punching_shear_strength_of_reinforced_recycled_concrete_slabs?ev=prf_pub">https://www.researchgate.net/publication/308924360_Punching_shear_streng...</a></span></p>
<p><a href="http://authors.elsevier.com/a/1TqoA3O1E14tug" target="_blank">http://authors.elsevier.com/a/1TqoA3O1E14tug</a></p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/fig2.jpg" type="image/jpeg; length=523209">fig2.jpg</a></span></td><td>510.95 KB</td> </tr>
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</div></div></div>Sun, 09 Oct 2016 19:26:01 +0000Flavio Stochino20426 at https://imechanica.orghttps://imechanica.org/node/20426#commentshttps://imechanica.org/crss/node/20426Mixed assumed-strain finite element model for laminates
https://imechanica.org/node/20403
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/162">computational mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/1251">finite elements</a></div><div class="field-item even"><a href="/taxonomy/term/8572">composite laminated plate</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Fibre-reinforced plates and shells are finding an increasing interest in engineering applications; in most cases dynamic phenomena need to be taken into account. Consequently, effective and robust computational tools are sought in order to provide reliable results for the analysis of such structural models. In this paper the mixed assumed-strain laminated plate element, previously used for static analyses, has been extended to the dynamic realm. This model is derived within the framework of the so-called First-order Shear Deformation Theory (FSDT). What is peculiar in this assumed-strain finite element is that in-plane strain components are modeled directly; the corresponding stress components are deduced via constitutive law. By enforcing the equilibrium equations for each lamina, and taking continuity requirements into account, the out-of-plane shear stresses are computed and, finally, constitutive law provides the corresponding strains. The resulting global strain field depends only on a fixed number of parameters, regardless of the total number of layers. Since the proposed element is not locking-prone, even in the thin plate limit, and provides an accurate description of inter-laminar stresses, an extension to the dynamic range seems to be particularly attractive. The same kinematic assumptions will lead to the formulation of a consistent mass matrix. The element, developed in this way, has been extensively tested for several symmetric lamination sequences; comparison with available analytical solutions and with numerical results obtained by refined 3-D models are also presented.</p>
<p><a href="https://www.researchgate.net/publication/308665134_Modal_analysis_of_laminates_by_a_mixed_assumed-strain_finite_element_model">https://www.researchgate.net/publication/308665134_Modal_analysis_of_lam...</a></p>
<p><a href="https://www.academia.edu/28929106/Modal_analysis_of_laminates_by_a_mixed_assumed-strain_finite_element_model">https://www.academia.edu/28929106/Modal_analysis_of_laminates_by_a_mixed...</a></p>
<p><a href="http://mms.sagepub.com/content/early/2016/09/23/1081286516666405.abstract">http://mms.sagepub.com/content/early/2016/09/23/1081286516666405.abstract</a></p>
</div></div></div>Wed, 05 Oct 2016 07:21:37 +0000Flavio Stochino20403 at https://imechanica.orghttps://imechanica.org/node/20403#commentshttps://imechanica.org/crss/node/20403RC beams under blast load: Reliability and sensitivity analysis
https://imechanica.org/node/20012
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3478">structural dynamics</a></div><div class="field-item odd"><a href="/taxonomy/term/4681">Reinforced concrete</a></div><div class="field-item even"><a href="/taxonomy/term/10421">Blast Load</a></div><div class="field-item odd"><a href="/taxonomy/term/3846">Impact loading</a></div><div class="field-item even"><a href="/taxonomy/term/2453">nonlinear dynamics</a></div><div class="field-item odd"><a href="/taxonomy/term/6804">structural reliability</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><img src="http://imechanica.org/files/Fig_int.jpg" alt="" width="337" height="210" /></p>
<p><span>The effects </span><span>of blast loading on structures can be very dangerous: damages and failures are expected with serious threats to structural safety and human life. Materials stresses and strains are often pushed to the limit and the modelling of these phenomena can be very complex. In order to design blast-resistant structures it is very important to determine what are the key parameters of this problem.</span></p>
<p> </p>
<p>This paper presents a reliability and parametric analysis of the response of reinforced concrete (RC) beams under blast loads. The main aim is to highlight the key parameters of the problem in order to produce information useful for the design of reliable blast-resistant RC structures.</p>
<p> </p>
<p>The beam has been idealised as an equivalent SDOF system, in which strain-rate effects are accounted for. This approach is convenient from a computational point of view and it has been validated by a direct comparison with a more sophisticated finite element model and with experimental results found in literature. Then a sensitivity analysis of the parameters involved in beam response under blast load has been developed. Slenderness (which has a direct effect on stiffness) and peak load prove to be the most important parameters, but span length (which has an important influence on the mass) is also a key parameter. Other variables such as concrete strength and reinforcement ratio do not seem to have a strong correlation with the beam response</p>
<p> </p>
<p><a href="http://www.sciencedirect.com/science/article/pii/S1350630716302758">http://www.sciencedirect.com/science/article/pii/S1350630716302758</a></p>
<p><a href="https://www.academia.edu/26311647/RC_beams_under_blast_load_reliability_and_sensitivity_analysis">https://www.academia.edu/26311647/RC_beams_under_blast_load_reliability_...</a></p>
<p><span><a href="https://www.researchgate.net/publication/303095763_RC_beams_under_blast_load_Reliability_and_sensitivity_analysis">https://www.researchgate.net/publication/303095763_RC_beams_under_blast_...</a></span></p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/Fig_int.jpg" type="image/jpeg; length=1927778">Fig_int.jpg</a></span></td><td>1.84 MB</td> </tr>
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</div></div></div>Sun, 19 Jun 2016 21:02:51 +0000Flavio Stochino20012 at https://imechanica.orghttps://imechanica.org/node/20012#commentshttps://imechanica.org/crss/node/20012Sardinia radio telescope finite element model updating by means of photogrammetric measurements
https://imechanica.org/node/19395
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1251">finite elements</a></div><div class="field-item odd"><a href="/taxonomy/term/162">computational mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/3596">astronomy</a></div><div class="field-item odd"><a href="/taxonomy/term/2970">Structural Engineering</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p> <img src="http://imechanica.org/files/EL90_erroreassoluto_dopoT-eps-converted-to.jpg" alt="" width="521" height="448" /><span>The 64 m diameter Sardinia Radio Telescope (SRT), located near Cagliari (Italy), is the world’s second largest fully steerable radio telescope with an active surface. Among its peculiarities is the capability of modifying the configuration of the primary mirror surface by means of electromechanical actuators. This capability enables, within a fixed range, balancing of the deformation caused by external loads. In this way, the difference between the ideal shape of the mirror (which maximizes its performance) and the actual surface can be reduced. The control loop of the radio telescope needs a procedure that is able to predict SRT deformation, with the required accuracy, in order to reduce deviation from the ideal shape. To achieve this aim, a finite element model that can accurately predict the displacements of the structure is required. Unfortunately, the finite element model of the SRT, although very refined, does not give completely satisfactory results, since it does not take into account essential pieces of information, for instance, thermal strains and assembly defects. This paper explores a possible update of the finite element model using only the benchmark data available, i.e. the photogrammetric survey developed during the setup of the reflecting surface. This updating leads to a significant reduction in the differences between photogrammetric data and results of the numerical model. The effectiveness of this tuning procedure is then assessed.</span></p>
<p>paper links:</p>
<p><a href="http://mms.sagepub.com/content/early/2015/12/30/1081286515616046.abstract">http://mms.sagepub.com/content/early/2015/12/30/1081286515616046.abstract</a></p>
<p><a href="https://www.academia.edu/20943178/Sardinia_Radio_Telescope_finite_element_model_updating_by_means_of_photogrammetric_measurements">https://www.academia.edu/20943178/Sardinia_Radio_Telescope_finite_elemen...</a></p>
<p><a href="https://www.researchgate.net/publication/268519448_Sardinia_radio_telescope_finite_element_model_updating_by_means_of_photogrammetric_measurements">https://www.researchgate.net/publication/268519448_Sardinia_radio_telesc...</a></p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/EL90_erroreassoluto_dopoT-eps-converted-to.jpg" type="image/jpeg; length=389900" title="EL90_erroreassoluto_dopoT-eps-converted-to.jpg">PGM_FE_comparison</a></span></td><td>380.76 KB</td> </tr>
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</div></div></div>Wed, 27 Jan 2016 15:20:36 +0000Flavio Stochino19395 at https://imechanica.orghttps://imechanica.org/node/19395#commentshttps://imechanica.org/crss/node/19395The Sardinia Radio Telescope: A comparison between close-range photogrammetry and finite element models
https://imechanica.org/node/19331
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/2970">Structural Engineering</a></div><div class="field-item odd"><a href="/taxonomy/term/162">computational mechanics</a></div><div class="field-item even"><a href="/taxonomy/term/1251">finite elements</a></div><div class="field-item odd"><a href="/taxonomy/term/3596">astronomy</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p> </p>
<p><img src="http://imechanica.org/files/SRTtotale_0.jpg" alt="" width="451" height="602" /></p>
<p><span>T</span><span>he Sardinia Radio Telescope (SRT), located near Cagliari (Italy), is the world’s second largest fully steerable radio telescope endowed with an active-surface system. Its primary mirror has a quasi-parabolic shape with a diameter of 64 m. The configuration of the primary mirror surface can be modified by means of electro-mechanical actuators. This capability ensures, within a fixed range, the balancing of the deformation caused, for example, by loads such as self-weight, thermal effects and wind pressure. In this way, the difference between the ideal shape of the mirror (which maximizes its performances) and the actual surface can be reduced. In this paper the authors describe the characteristics of the SRT, the close-range photogrammetry (CRP) survey developed in order to set up the actuator displacements, and a finite element model capable of accurately estimating the structural deformations. Numerical results are compared with CRP measurements in order to test the accuracy of the model.</span></p>
<p><span><span><a href="http://mms.sagepub.com/content/early/2015/12/21/1081286515616227.refs">http://mms.sagepub.com/content/early/2015/12/21/1081286515616227.refs</a></span></span></p>
<p><a href="https://www.academia.edu/20219414/The_Sardinia_Radio_Telescope_A_comparison_between_close-range_photogrammetry_and_finite_element_models">https://www.academia.edu/20219414/The_Sardinia_Radio_Telescope_A_compari...</a></p>
<p> </p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
<tbody>
<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/SRTtotale_0.jpg" type="image/jpeg; length=529273">SRTtotale.jpg</a></span></td><td>516.87 KB</td> </tr>
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</div></div></div>Wed, 13 Jan 2016 14:58:32 +0000Flavio Stochino19331 at https://imechanica.orghttps://imechanica.org/node/19331#commentshttps://imechanica.org/crss/node/19331Continuous transition between traveling mass and traveling oscillator using mixed variables
https://imechanica.org/node/18945
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/3478">structural dynamics</a></div><div class="field-item odd"><a href="/taxonomy/term/6985">beam vibrations</a></div><div class="field-item even"><a href="/taxonomy/term/4988">Floquet theory</a></div><div class="field-item odd"><a href="/taxonomy/term/8439">dynamic stability</a></div><div class="field-item even"><a href="/taxonomy/term/3480">eigenfrequency</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p> </p>
<p><img src="http://imechanica.org/files/Figure_03c_0.jpg" alt="" width="392" height="214" /></p>
<p> </p>
<p><span>T</span><span>he interaction bet</span><span>ween cars or trains and bridges has been often described by means of a simplified model consisting of a beam loaded by a traveling mass, or by a traveling oscillator.Among others, two aspects are essential when dealing w</span><span>ith masses traveling along flexible vibrating supports: (i) a complete relative kinematics; and (ii) a continuous transition between a traveling mass, rigidly coupled, and a traveling oscillator, elastically coupled with the support.</span></p>
<p>The kinematics is governed by normal and tangential components—with respect to the curved trajectory—of the acceleration. However in literature these parts are oriented with reference to the undeformed beam configuration. This model is improved here by a non-linear second-order enriched contribution.</p>
<p>The transition between a traveling oscillator and a traveling mass is governed by the stiffness k of the elastic or viscoelastic coupling which, in the latter case (i.e. rigid coupling), has to tend towards infinity.</p>
<p>However, very large stiffness values cause high frequencies and significant problems are mentioned in the literature in order to establish numerically stable and reliable results and in order to realize a continuous evolution between absolute and relative formulations.</p>
<p>By using mixed state variables, generalized displacements and coupling forces, the contribution from the stiffness changes from k to its inverse 1/k, the coupling force itself becomes a member of the solution-space and the problems, which have been mentioned in the literature, disappear. As a matter of fact, the coupling force can also take into account a viscoelastic contribution; moreover, a larger number of traveling oscillators can be considered, too.</p>
<p>Finally, for a periodic sequence of moving oscillators the dynamic stability is treated in the time-domain along several periods, as well as in the spectral domain, by using Floquet׳s theorem.</p>
<p> </p>
<p>JOURNAL LINK: <a href="http://www.sciencedirect.com/science/article/pii/S0020746215001481">http://www.sciencedirect.com/science/article/pii/S0020746215001481</a></p>
<p><a href="https://www.academia.edu/16500036/Continuous_transition_between_traveling_mass_and_traveling_oscillator_using_mixed_variables">https://www.academia.edu/16500036/Continuous_transition_between_travelin...</a></p>
<p> </p>
</div></div></div><div class="field field-name-upload field-type-file field-label-hidden"><div class="field-items"><div class="field-item even"><table class="sticky-enabled">
<thead><tr><th>Attachment</th><th>Size</th> </tr></thead>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="Image icon" title="image/jpeg" src="/modules/file/icons/image-x-generic.png" /> <a href="https://imechanica.org/files/Figure_03c_0.jpg" type="image/jpeg; length=135710" title="Figure_03c.jpg">Absolute description of the motion of an elastically coupled mass traveling along a beam.</a></span></td><td>132.53 KB</td> </tr>
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</div></div></div>Tue, 06 Oct 2015 08:38:21 +0000Flavio Stochino18945 at https://imechanica.orghttps://imechanica.org/node/18945#commentshttps://imechanica.org/crss/node/18945CONSTITUTIVE MODELS FOR STRONGLY CURVED BEAMS IN THE FRAME OF ISOGEOMETRIC ANALYSIS
https://imechanica.org/node/18152
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/6610">NURBS</a></div><div class="field-item odd"><a href="/taxonomy/term/6437">Isogeometric Analysis</a></div><div class="field-item even"><a href="/taxonomy/term/162">computational mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/6340"># Finite Element modeling</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>The current development of the isogeometric approach in various fields of mechanics is explained by the high-accuracy results which can be achieved at a reduced computational cost by codes based on non-uniform rational B-splines (NURBS). In the case of strongly curved beams the simple diagonal de Saint-Venant’s constitutive model can lead to significant errors as it has been reported in the classic literature. Other models such as Winkler’s have been proposed and seem more suitable for these kinds of structures. Unfortunately several numerical codes are based on a diagonal constitutive model which neglects the coupling effect of elongation and curvature even if a highly refined geometry description can be developed by means of NURBS. The results obtained by means of numerical codes based on isogeometrical analysis for curved beams are here reported and basic choices, computational costs and numerical accuracy of the above-mentioned constitutive models are discussed, from a qualitative and quantitative point of view. This comparison, in the authors’ opinion, is necessary to avoid an excessive gap between the computational efficiency of NURBS, which are capable of very accurate geometry description, and a simplistic representation of the constitutive relations that is efficient for straight beams but not so much for curved beams whose curvature is large. The results of some selected tests are presented and discussed to highlight differences between the two approaches, showing that the small increase of computational cost of Winkler’s model is well compensated by the accuracy gain.</p>
<p><span><a href="http://mms.sagepub.com/content/early/2015/03/30/1081286515577043.abstract">http://mms.sagepub.com/content/early/2015/03/30/1081286515577043.abstract</a></span></p>
<p><span><span><a href="https://www.academia.edu/11765163/CONSTITUTIVE_MODELS_FOR_STRONGLY_CURVED_BEAMS_IN_THE_FRAME_OF_ISOGEOMETRIC_ANALYSIS">https://www.academia.edu/11765163/CONSTITUTIVE_MODELS_FOR_STRONGLY_CURVE...</a></span></span></p>
<p> </p>
</div></div></div>Thu, 09 Apr 2015 07:48:35 +0000Flavio Stochino18152 at https://imechanica.orghttps://imechanica.org/node/18152#commentshttps://imechanica.org/crss/node/18152What is the importance of strain rate on structural response under blast load?
https://imechanica.org/node/16821
<div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/10420">SDOF</a></div><div class="field-item odd"><a href="/taxonomy/term/10421">Blast Load</a></div><div class="field-item even"><a href="/taxonomy/term/8562">dynamic strain rate</a></div><div class="field-item odd"><a href="/taxonomy/term/4681">Reinforced concrete</a></div><div class="field-item even"><a href="/taxonomy/term/3478">structural dynamics</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p class="MsoNormal">What is the importance of strain rate on structural response under blast load?</p>
<p class="MsoNormal">This and other issues are discussed in the recent paper from Stochino F. and Carta G.:</p>
<p class="MsoNormal">“SDOF models for reinforced concrete beams under impulsive loads accounting for strain rate effects”, DOI: 10.1016/j.nucengdes.2014.05.022, Nuclear Engineering and Design 276, (2014), 74-86.</p>
<p class="MsoNormal"><a href="http://www.sciencedirect.com/science/article/pii/S002954931400301X">http://www.sciencedirect.com/science/article/pii/S002954931400301X</a></p>
<p class="MsoNormal"><a href="https://www.academia.edu/7450354/SDOF_models_for_reinforced_concrete_beams_under_impulsive_loads_accounting_for_strain_rate_effects">https://www.academia.edu/7450354/SDOF_models_for_reinforced_concrete_bea...</a></p>
<p class="MsoNormal">In this paper, reinforced concrete beams subjected to blast and impact loads are examined. Two single degree of freedom models are proposed to predict the response of the beam. The first model (denoted as <span lang="EN-US" xml:lang="EN-US">“</span>energy model<span lang="EN-US" xml:lang="EN-US">”</span>) is developed from the law of energy balance and assumes that the deformed shape of the beam is represented by its first vibration mode. In the second model (named <span lang="EN-US" xml:lang="EN-US">“</span>dynamic model<span lang="EN-US" xml:lang="EN-US">”</span>), the dynamic behavior of the beam is simulated by a spring-mass oscillator. In both formulations, the strain rate dependencies of the constitutive properties of the beams are considered by varying the parameters of the models at each time step of the computation according to the values of the strain rates of the materials (i.e. concrete and reinforcing steels). The efficiency of each model is evaluated by comparing the theoretical results with experimental data found in literature. The comparison shows that the energy model gives a good estimation of the maximum deflection of the beam at collapse, defined as the attainment of the ultimate strain in concrete. On the other hand, the dynamic model generally provides a smaller value of the maximum displacement. However, both approaches yield reliable results, even though they are based on some approximations. Being also very simple to implement, they may serve as an useful tool in practical applications.</p>
</div></div></div>Thu, 26 Jun 2014 06:39:25 +0000Flavio Stochino16821 at https://imechanica.orghttps://imechanica.org/node/16821#commentshttps://imechanica.org/crss/node/16821Theoretical models to predict the flexural failure of reinforced concrete beams under blast loads
https://imechanica.org/node/14023
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/8350">Reinforced concrete beams; Blast loads; Continuous beam model; SDOF model; Strain rate; Deflection time-history</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p><span>The paper by Carta G. and Stochino F. presents two alternative approaches for the study of reinforced concrete beams under blast loads. In the first approach, the beam is modeled by means of Euler–Bernoulli’s theory and its elastic–plastic behavior is expressed through a new nonlinear relationship between bending moment and curvature. In the second approach, instead, the beam is idealized as a single degree of freedom system. The effects of strain rate, which are of paramount relevance in blast problems, are taken into consideration by introducing time-variable coefficients into the equations of motion derived from the two models. The latter are employed to assess the time-history of the maximum deflection of a simply supported beam subjected to a uniformly distributed blast load. By comparing the theoretical results with some experimental findings available in literature and with the solution obtained from a commercial finite element software, it is found that the first approach is capable of accurately evaluating the maximum deflection of the beam at failure; on the other hand, the second approach provides a less precise prediction, however it is simpler to implement in practice because it requires less computational effort.</span></p>
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<strong>Journal Link: <a id="ddDoi" href="http://dx.doi.org/10.1016/j.engstruct.2012.11.008" target="doilink">http://dx.doi.org/10.1016/j.engstruct.2012.11.008</a> </strong>
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</div></div></div>Tue, 15 Jan 2013 08:39:17 +0000Flavio Stochino14023 at https://imechanica.orghttps://imechanica.org/node/14023#commentshttps://imechanica.org/crss/node/14023Experimental Results: RC beams under blast load
https://imechanica.org/node/12136
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>
Good morning,
</p>
<p>
I'm looking for some field results concerning blast load on RC beams. In particular I'm interested in the time history of pressure and deflection. Does anybody know any publication dealing with this topic?
</p>
<p>
Thanks for your kind attention.
</p>
</div></div></div>Wed, 21 Mar 2012 16:47:35 +0000Flavio Stochino12136 at https://imechanica.orghttps://imechanica.org/node/12136#commentshttps://imechanica.org/crss/node/12136Error | iMechanica