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Evaluation of Structural Response Factors Using Ground Motions Recorded During the Loma Prieta Earthquake

by E. Miranda and V. Bertero

Miranda, E., and V. Bertero (1991). Evaluation of Structural Response Factors Using Ground Motions Recorded During the Loma Prieta Earthquake. SMIP91 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 4-1 - 4-10.

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Abstract

Present procedures of defining seismic design forces are based on the use of elastic spectra reduced by a response modification factor which only depends on the type of structural system. This paper summarizes the results of an analytical study concerning strength reduction factors. Strength demand and strength reduction spectra were computed using simplified elastic and inelastic bilinear SDOF structural models and 36 ground motions recorded during the 1989 Loma Prieta earthquake. Special emphasis was given to the influence of local site conditions. Results show that strength reduction factors are significantly affected by the level of inelastic deformation, the period of vibration and by local site conditions.