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different period and story draft using shell and membrane

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useetabs

Structural
Joined
Jan 4, 2006
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6
Location
CA
I use etabs 8.5.6 to model a 35 story building. I model the slabs using shell and membrane and obtain different period.
torsion x y
shell 4.6 3.5 4.15
membrane 20.3 7.5 15.6

the drafts using membrance are much larger than using shell.

please whether it makes sense or the mode has some problem?


 
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