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Re: qustion about ETABS

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Better ask this question to support of Computers & Structures, Inc.  They will have the definite answer and not a speculative answer from this forum.

On 5/9/06, Amir Gomma <ec_cai_amir(--nospam--at)> wrote:
i am modeling a heigh rise building using ETABS ,  i defined the response spectrum seismic loads by UBC1997, i have a raft 3.0 m thick. the proplem that i am getting response spectrum base reaction differnt from the story shear due to the response spectrum case of loading at the bottom of the basement ( the story shear is less than the response spectrum base reaction ) . i removed the raft and made the supports as fixed . so the problem solved . why the raft make the response spectrum base reaction differnt from story shear at the bottom of first story after raft .

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