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Dynamic Amplification of Ground Motions by Low-Rise, Stiff Shear Wall Buildings

by J . Raggett and C . Rojahn

Raggett, J., and C . Rojahn (1991). Dynamic Amplification of Ground Motions by Low-Rise, Stiff Shear Wall Buildings. SMIP91 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 16-1 - 16-11.

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Abstract

Dynamic amplification was defined as the ratio of actual peak base shear to an equivalent rigid- body base shear. Peak base shear was determined by summing the product of mass-times- acceleration for every element of mass in the building. An acceleration distribution over the entire building was assumed in terms of recorded acceleration time histories at several locations. Time histories from four buildings were studied. Due to diaphragm flexibility primarily, the dynamic response of these buildings did not differ significantly from that which would have occurred from a five-to seven-story steel frame. Actual peak base shears for this class of buildings was as high as 1.76 times equivalent rigid body base shears.