Hi everyone. This is the first time I use IBC 2003 and I would appreciate If anyone could clarify me what is the vertical design spectral response acceleration that I have to use to dynamically analyze my strucrure. The horizontal one is clearly defined in the IBC 2003, but I can not find the vertical spectrum. Section 1617.1.1 details the combined sesimic load, but using a vertical load obtained as a proportional part of the weight. If I use that vertical load I wont consider the dynamic effects of the load. Some other codes like IBC recommends using two thirds of horziontal spectrum in vertical direction. Can anyone help me?
Thanks in adcance.
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