Buckling Analysis Using Shell Elements

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avecillas
Posts: 1
Joined: Sat Feb 20, 2016 7:40 am
Location: Universidad de Cuenca

Buckling Analysis Using Shell Elements

Post by avecillas » Tue May 16, 2017 8:58 am

Good morning to all the OpenSees Community.

I am trying to capture the buckling shape and buckling load of a steel shear wall using ShellMITC4 elements.
The following is a summary of the procedure that I'm using:

1) Eigen Buckling Problem
([K]-(lambda)*[K_g])*{phi} = 0, where K_g is the Geometric Stiffness.
2) Get initial K without any loading (linear material, linear geomTransf and ForceControl)
3) Apply shear loading to shell. (Elastic material. Corotational geomTransf ---> Get Tangent Stiffness matrix, K2).
4) In Matlab, solve the eigenbuckling problem:
([K]-(lambda)*[K2-K1])*{phi} = 0

There are two main questions that I have:

1) Does Corotational geomTransf work for shell elements ?
2) Does anyone in the forum have experience with buckling analysis using shell elements?

Thank you all for your time.

Javier A. Avecillas
VT

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