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Posted: **Sun Apr 07, 2024 3:49 am**

Dear STKO team:

I have built a simple joint model containing pinching4 material, I did hysteretic analysis using dispBeamColumn element and forceBeamColumn element respectively. The other parameters are same, but the hysteresis curves and fiber strain are very different. What is the reason for the difference? I am curious which result is correct.

Model is in the attachment. Looking forward to your reply. Thanks in advance.

Best wishes

Posted: **Tue Apr 30, 2024 10:02 am**

Short answer:
Force-based element is more accurate. Disp-based -> you need more elements per structural member.

Long answer:
Since you are using pinching 4 with softening, you have to pay attention to mesh-objectivity with respect to the amount of dissipated energy.

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Significant differences in results between dispBeamColumn and forceBeamColumn element

Significant differences in results between dispBeamColumn and forceBeamColumn element

Re: Significant differences in results between dispBeamColumn and forceBeamColumn element