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Results of our academic investigation of the I-35W bridge collapse

Submitted by Roberto Ballarini on
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I-35W bridge collapse

I attach an essay we wrote for a book that will be published by University of Minnesota Press titled "The city, the river, the bridge." The essay is a transcription of part of a public lecture I gave on infrastructure and on the bridge collapse.

After the bridge collapse there were several posts on Imechanica that included speculation about the cause of the collapse, including fatigue crack growth, lack of redundancy, etc.. Our investigation determined the collapse was a result of an undersized gusset plate that reached its plastic limit load. 

Anybody who can send me some Xfem code.

Submitted by lcwlcw on
research

Hello,

    I am a PhD student in Xi'an, China.

    I am studying  some XFEM related papers, to start coding the method, I thought it would be easier if I go through a code for a basic XFEM problem.

   If anybody who have  the code, please send it to me.

  my email:    lcwlxh [at] 163.com (lcwlxh[at]163[dot]com)

    Thank You. 

 

How we can calculate stress intensity factor for bimaterial interface

Submitted by kaslantas on
research

Hi friends,

I would like to calculate stress intensity factor for bimaterial interface using finite element method. Do you have any suggestion about it? Actually I know a method. According to this method,

1-obtain crack face displacement using numerical solution

2- use dundur parameter 

 

Is this method is correct/enough?

 

As you know Franc2D code calcuate SIF for mode I and mode I. But I do not know this code can calculate SIF for bimaterial interface? 

Thanks 

how to define mohr coulomb theory in Abaqus

Submitted by greensix666 on
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Dear all 

i am a new abaqus user, now i use this software to modeling a few layers of soil layers (in geotechnical engineering), here is the information of the ground profile

[0-4m] fill sand layer; Density = 18kN/m2, firction angle=30, cohesion=0, void ratio=0.5  

[4-12m] marine deposit; Density = 16kN/m2, firction angle=10, cohesion=30, void ratio=0.5   

[12-22m]  Alluvium; Density = 18kN/m2, firction angle=30, cohesion=5, void ratio=0.5   

Time depended modeling of plate

Submitted by Mike W. Long on
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RBF

Hello,

i'm working on the modeling of thin plate under transverse load. The basic function used for approximation of field variable is RBF function. There are a lot of publications, how the static model of the plate can be created, but no information about dynamic modeling. The following questions are not clear for me:

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