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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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.