桥梁倾覆坍塌 - 为什么独柱墩不加盖梁？
国内高速公路和城市高架大量采用独柱墩设计，近年已发生多起倾覆坍塌事故。以笔者来看，设计规范需要改进，特别在倾覆核算的要求和引导上更全面并提高安全系数，设计不够严谨是另一原因。
从结构力学来看，两个问题：
1.许多的独柱墩设计为何不加盖梁？仅为美观（相对成本应较小）？如加盖梁发生的几起倾覆坍塌事故应该都可避免，全国范围天文数字的高速公路和城市高架加固改造资金可大量节省。。。。
2. 独柱墩（特别是单支点）的抗震性是如何考虑的，比如在京津唐地震带。。。。
Frankxu's blog
A variational approach to predict percolation thresholds of nanomaterials
Study on the properties of inhomogeneous media plays a central role throughout the history of physics, e.g.
Possion’s theory on magnetism of composites, Faraday’s dielectric model of composites, Maxwell’s and later
Rayleigh’s work on conductivity of composites, and Einstein’s thesis on viscosity of fluid-particle media. As
a special branch of this field, percolation research on phase transition and critical phenomena was originated
with lattice percolation theories in 1950s [1]. The idealization of a lattice structure is convenient for analytical
A PhD student position is available on nonlinear multiscale modeling of materials
A PhD student position is available on nonlinear multiscale modeling of materials for Fall 2010. Please contact xxu1 [at] stevens.edu ASAP
X. Frank Xu, PhD, Assistant Professor
Dept of Civil, Envir & Ocean
Engrg
Stevens Institute of Technology
Hoboken, NJ
07030
201-216-8711(O)
201-216-8739 (Fax)
http://personal.stevens.edu/~xxu1
Integrity of Scholarly Publishing under Attack
This issue of CAM digest re-published D.N. Arnold's article "Integrity under Attack - the state of scholarly publishing". The orginal article is available via weblink
http://www.ima.umn.edu/~arnold/siam-columns/integrity-under-attack.pdf
Variational principles for uncertainty quantification of random heterogeneous materials
The article can be downloaded from http://personal.stevens.edu/~xxu1/authorProof-07-10-1234.pdf
A novel "multiscale stochastic finite element method" on solid mechanics
Research on multiscale stochastic modeling is becoming big. In this article "A Green-function-based multiscale method for uncertainty quantification of finite body random heterogeneous materials" doi:10.1016/j.compstruc.2009.05.009 , one of the first multiscale stochastic methods is developed for solid mechanics applications.....