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  1. amt55

    Minimum Base Shear

    Thanks WillisV! I suppose that's a reasonable concern. Any idea where the number 85% comes from? Setting an absolute minimum like 85% for all structures doesn't really correlate to the adverse effects of modeling. It affects structures with long periods far more than it affects structures with...
  2. amt55

    Minimum Base Shear

    Can anyone explain why, in a Modal Response Spectrum Analysis, the code requires that the modal base shear is scaled up to 85% of the calculated base shear (ASCE 7-05 section 12.9.4)? Thanks all!

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