Good day, In my attached project, there is no problem with the reinforced concrete part on the lower two floors, while the upper steel const. After adding the roof, the build period reached an abnormal value in 1st mode. Because buckling also occurred in the 1st mode in the structure. I must have probably made a mistake in the steel design. But I couldn't find my mistake. I will be very pleased if you can check the project and give urgent information. I wish conveniences.
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