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Your answer is much appreciated. However, actually the problem stems from a part of inelastic response spectrum analysis. So time response analysis of short-period, i.e. very stiff, nonlinear materials is a necessary process. I am wondering if there are other means to get reasonable acceleration ...

Dear STKO team:

I built a simple single-degree-of-freedom (SDOF) model in STKO to perform time history analysis. The model includes two nodes and one zeroLength element. The zeroLength element was assigned with Steel01 material. The yield strength was 10 times ite weigth (Fy = 10mg). I adopted ...

Dear STKO team

Thanks for your reply. Now the model can run successfully. However, the beams and columns are connected in the weak axes. How can I change the local axes to make them connect in strong axil?

Dear STKO team

I am trying to run a modal analysis of a steel braced frame. However, the first ten obtained periods were same and the MPCO recorder could not display the modal shape correctly. Can you help me figure out what's wrong with my model?

Dear STKO team,
I am trying to construct two connected truss elements to study the hysteretic behavior when two different materials are connected in series. However, the model is not converging, Could you assist me in identifying the issues? Thanks a lot!
Best regards

Dear STKO team,

I am performing a seismic time history analysis of an RC frame with infill wall. The infill wall is modelled by the twoNodeLink element. The column is divided into three segments to accommodate the placement of the TwoNodeLink element. However, the model is not running, and I am ...

ValentinaSB wrote: ↑

Thu May 11, 2023 7:57 am

Hi wsadwsad,

Try to use 'Make wire' instead of 'Merge' command. Let me know if it is what you needed.

Best wishes,
Valentina

It perfectly resolved my issue. Thank you very much!

Dear STKO team：

I am trying to add diagonal braces to a frame, and I want these two braces to not connected each other in between. However, when I merge the model, a vertex is automatically created at the intersection point of the braces. Is there any way to remove this vertex?

The fracture energies (i.e. the area under the tensile and compressive curves) of your concrete materials are too low. And they cause a snap back in your force-based element, therefore, as soon as it passes the peak, it suddently cannot converge anymore.

According to CEB-FIB model code, the ...

try using Adaptive time step in the dynamic analysis and a simpler concrete model

Thank you for your answer. I've tried using concrete02 material instead of concreteCM, as well as using adaptive analysis steps, but the model still doesn't converge after just a short run. I look forward to ...