Peryot 2

A

abaci09

New Member
In a building with basement ground mezzanine floor and 3 normal floors, T=2.04 in the first 3 modes and T=0.74 in the 4th mode, do you think it is normal for the period to be 2, 18 modes were insufficient in dynamic analysis, so I made the number of modes 30. Thanks in advance, I will add the project
 
I found the problem, thanks. Hollow floor slab was not fully formed in a slab with semi-rigid diaphragm, so period 2 would occur.
 
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