running error

[[email protected]]

Hello,
The RC shear wall was established in the

220321.zip

(209.68 KiB) Downloaded 376 times

. When submitting, the running error in the command box.
Waiting for your reply.

[STKO Team]

It's because you are trying to run a parallel analysis with OpenSeesMP without a partition.
Remember to call the Partition command after the BuildMesh command if you want to use OpenSeesMP

[[email protected]]

Thank you for your reply. It is successful.
In my model, I hope there are only horizontal and vertical displacement (Ux and Uz) at the top position. So rotations in three directions (Rx, Ry and Rz) and out-of-plane displacement (Uy) at the top position (the red line in the picture ) were fixed. However, model results in the Post Processor show that the rotation (Ry) generated at the top of the wall .
Wait for your reply.

[STKO Team]

Here's the working file:

wall-mine-220318.zip

(181.03 KiB) Downloaded 378 times

The in-plane rotation in shells is not like the out-of-plane rotation.
It does not represent the rigid body rotation, but a deformational rotation also called drilling rotation. It is something related to the Cosserat continuum theory.

If you want to fix the in-plane RIGID BODY rotation of a shell you need to:

Release the deformational rotation Ry:

fix_inplane_rot_1.png (57.4 KiB) Viewed 6037 times

Add an interaction to impose the same displacement in Z. Since the rigid body rotation about Y consists in a skew-symmetric displacement in Z (+ on the right, - on the left), the equal DOF in Z will constrain the rigid body rotation:

fix_inplane_rot_2.png (65.68 KiB) Viewed 6037 times

This is what you get:

fix_inplane_rot_1.png (57.4 KiB) Viewed 6037 times

[[email protected]]

Thank you. It is succeed.
Because the in-plane rotation of top was not fully constrained in the test, the stiffness of hysteresis curves is smller. If the top can rotate at a small angle, how to set the condition of the top? It maybe reduce the stiffness of hysteresis curves in simulation. And I think it is a little unreasonable to adjust the elastic modulus of material propertyies and size of model for reduce of stiffness.

[STKO Team]

The boundary condition I suggested is for a shear-type condition, so no rotation on top.
If instead, the experimental setup allows rotation, you need to use a different condition. Could you please explain in detail the experimental setup for the top boundary?