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Download ideCAD for ASCE 7-16 |
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SYMBOLS
Ωo = Overstrength factor
R = Response modification coefficient
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According to the ASCE 7-16 design approach, the structure can be designed for a base shear equal to Ve/R. Coefficient R is the response modification coefficient. The base shear Ve/R is the minimum expected yield strength in the building. The actual first yield in the structural framing and the actual expected strength of the building are expected to be higher than the design base shear. Several factors contribute to the overstrength, including material overstrength and strain-hardening, conservatism in design load combinations and strength reduction factors, three-dimensional interactions among structural (and nonstructural) parts of the building that are not considered in analytical models used in the design, and other factors such as drift limits that may control building proportions. The expected base-shear strength is designated as Ωo (Ve/R), in which Ω0 is the system overstrength factor.
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