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The reason ASCE 7 Section 12.9 requires scaling up modal response forces is because engineers may model a structure using assumptions that results in an overly flexible model. Since use of an overly flexible model will result in a period T that is excessively large, it will also result in...
ASCE 7-16 (and 7-22) section 12.9.1.4.2 states that, if the MRSA drift base shear is < Cs*W where Cs is determined in accordance with Eq. 12.8-6 (or 12.8-7 in ASCE 7-22), then the MRSA drifts are scaled up by Cs*W / Vt. There seem to be two interpretations of this provision: (a) scale up to Eq....
Minimum Design Loads and Associated Criteria for Buildings and Other Structures, ASCE/SEI 7-22 provides the most up-to-date and coordinated loading provisions for general structural design. This standard prescribes design loads for all hazards including dead, live, soil, flood, tsunami, snow,...