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Response Spectrum Analysis (Building)

Response Spectrum Analysis (Building)

(OP)
I have a one story building approximately 230'x230' with steel braced frames, pretty symmetric layout. I am puzzled by results of Response Spectrum Analysis. When acceleration is in on X-direction, there is sizable total base shear (more than 60% of X direction base shear) in the perpendicular Z-direction. Does this make sense? Shall the sum of support reactions in Z-direction be zero, when there is no acceleration and external force in Z-direction? Otherwise equilibrium does not hold in the Z-direction.

Thank you very much for your responses.

RE: Response Spectrum Analysis (Building)

How is you analysis being performed, if it takes into account torsion maybe that is the cause? If it's software, maybe you aren't understanding the output?

I would think more information is needed to understand what might be happening here.

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