Evaluation of the MPA Procedure for Estimating Seismic Demands: RC-SMRF Buildings

Abstract eng:
The median seismic demands for 4-, 8-, 12-, and 20-story reinforced concrete special moment resisting frame (RC-SMRF) buildings—designed to comply with current codes—due to an ensemble of 78 ground motions scaled to four intensity levels were computed by MPA and nonlinear RHA, and compared. It is demonstrated that, even for the most intense ground motions that deform the buildings far into the inelastic range, the MPA procedure demonstrates an adequate degree of accuracy that should make it useful for practical application in estimating seismic demands for RC-SMRF buildings. In contrast the FEMA-356 force distributions are inadequate in estimating seismic demands for the 8-, 12-, and 20-story buildings at all excitation intensities, from the weakest that causes response essentially within the linearly elastic range to the strongest that drives the buildings far into the inelastic range.

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