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Torsional Response Characteristics of Regular Buildings Under Different Seismic Excitation Level

by H. Sedarat, S. Gupta and S. Werner

Sedarat, H., S. Gupta and S. Werner (1991). Torsional Response Characteristics of Regular Buildings Under Different Seismic Excitation Level. SMIP91 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 8-1 - 8-10.

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Abstract

Torsional response characteristics of three regular buildings in San Jose and one in Watsonville, California, were studied by analyzing the strong motion records from three recent earthquakes: 1989 Loma Prieta , 1986 M t . Lewis, and 1984 Morgan Hill. The story shear forces, torsional moments and dynamic eccentricities for these buildings during the three earthquakes were obtained from an analysis of the recorded motions. The fundamental period of vibrations and damping ratios for these buildings were also estimated for the three earthquakes. These results were then compared with t h e provisions of the 1988 Uniform Building Code. This comparison indicates that the provisions of the UBC may not realistically account for the torsional response of buildings during earthquakes.