Hello, The second order problem is caused by the DG1 console floor slab, which is defined alone in the basement. It is detected as a diaphragm. If you check the "Rigid diaphragm creation" option from the properties of the DG1 tile and analyze, your problem will be solved."trkitaro":1hrnp6f8" said:Hi, "Based Floor second order indicator value in the project is high. How can I go about removing the "Increase system rigidity" warning? Take it easy...