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I reloaded it and there's not much difference

I analyzed the concrete frame supported by the corner brace. When I analyzed the frame with the same height and different span, I found that his displacement load curve was not very different. I felt that it was a matter of self-weight, and I added a certain load but the difference was not obvious

Thank you for your detailed explanation. But the deformation pattern is still abnormal.It's not the same as the metamorphosis I had in ETabs.It's been going on for a long time. I can't get the right results.

I merged geometry from the beginning

In the STKO post-processing process, the support of the deformation diagram is disconnected. where problem went wrong？

Need to uninstall old version

You have a material is not added, check carefully