There is a small building I am working on, but I have tried as hard as I have ever tried in the analysis model. I could not overcome the ground safety stress. However, I still have concerns about whether there may be an error in the model. I need your help. The safety stress of D group Z4 is 12.5 tf/m². I would be very happy if you could take a look. .I'm going to post the project here, but its size seems too high. The file size of a z+3-storey building without a basement on a single flat is 6.6 mb, I don't understand it, it's a very high-capacity file. Can you help with this issue...