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I think it is caused by stress concentration, you can try to subdivide this element, and then apply the vertical load on several top nodes in the central zone.

According to my experience, it's stable, flexible and reliable.

http://opensees.berkeley.edu/OpenSees/m ... l/4052.htm
you can check this website.

You can simulate the pre-stresses reinforcing steel in the material level by using steel02.
uniaxialMaterial Steel02 $matTag $Fy $E $b $R0 $cR1 $cR2 <$a1 $a2 $a3 $a4 $sigInit>
define the parameter $siglnit to set the initial stress.
Good luck!

In OpenSees, you should define the mass and gravity respectively, you should use uniform load or node load to define the gravity

You can use it to model the hysteretic loop of element (force-disp relationship),or section (such as moment-curvature relationship), or material (stress-strain relationship).

Thank you for your generous help!
Appreciate.

If we want to get the length of the plastic hinge as accurate as possible, maybe we should subdivide the specimen into several elements or increase the number of integration points. But this will bring some other issues such as convergence problem and soften phenomenon. Dear Scott, would you like to...

I think this quite relys on the distribution of the integration points and the discretization of the specimen.
I'm also interested in this topic.

Hi, everyone. I have also done some research on progressive collapse based on OpenSees recently. Firstly, for the model based on fiber element, you can use Steel02 and fatigue at the same time, because fatigue material does't change the stress-strain relationship of any material, just when the damag...

I have also done some research on this model, I think it is not due to the accumulation stuff. This model really works well in all static analysis, only not fit for dynamic analysis.

Dear frank, I also did some tests, it worked in the new version 2.4.2. I just wonder in which version you have implemented this command because I have checked the change log, but i can't find corresponding information. Thank you！

In the new version 2.4.2, a new shear wall model, multi-layer shell element, has been developed and implemented in OpenSees. 1)The detailed informations and some examples can be found on this website: http://www.luxinzheng.net/download/OpenSEES/En_THUShell_OpenSEES.htm we hope this will help you rep...

Hi, AHARSHIAN, I'm a PHD student of Prof. Lu who developed this element. If you have any further question about the new shear wall element, please don't hesitate to contact with me！

Firstly, rigid diaphragm can only be utilized in 3D model. Secondly, if you want to restrict the displacement of four nodes, you can add two truss elements with large axial stiffness between two nodes in the diagonal derection. I have validated the reliability of this method both in 2D and 3D model,...