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Any ideas how to solve this?

I mean gaps that happen when you have a mismatched mesh. The following picture shows that exact same problem, the only difference is the area element type (I set the analysis option to Ux and Uy only in both cases to get identical results).

According to SAP2000 documentation, Edge constraints work with all area element. However, I noticed that if I resolve the problem posted by CSI in this video using plane-stress, I can clearly see some gaps. Is there a way to fix this other than changing the element type to shell. Thanks

I am looking for a way to calculate it by hand.

All textbooks I found explains how to formulate matrices for columns under axial loads, and the results matches the analysis of commercial software like Ansys. However, I found that Ansys can calculate "Eigenvalue" buckling load for a column loaded with a horizontal force only! I wonder if...

I am using SAP 2000 to design a steel frame structure using AISC360-10, according to SAP2000 documentations, the generated load combos defined in ASCE7-2010. I have four load cases Dead, Live, Roof live, and wind loads. I noticed that SAP2000 generated combinations according to ASCE7-2010, but...

I faced this problem before. Most likely, you forgot to assign section to one of (or all) line elements.