INFLUENCE OF ANGLE OF INCIDENCE ON THE SEISMIC DEMANDS FOR INELASTIC STRUCTURES SUBJECTED TO BI-DIRECTIONAL GROUND MOTIONS

This study investigated the influence that angle of incidence of applied bi-directional ground motions had on several engineering demand parameters (EDPs) for inelastic structures. The EDPs of interest in this study were peak drift, peak ductility, and peak slab rotation demands. The structural models had various degrees of inelasticity, plan irregularities, 5% damping ratios, and fundamental periods that ranged from 0.2 seconds to 2.0 seconds. This work utilized suites of ground motions recorded on stiff soils and on rock. The critical angle (the angle of incidence at which an EDP achieves a maximum) for a given EDP and bi-directional ground motion was found to occur at virtually any angle of incidence. For a given bi-directional ground motion and given fundamental period, the critical angle was found to vary unpredictably with increasing degree of inelasticity. The results also indicated that, on average, applying bi-directional ground motions only along the principal axes of an…

Author: Rigato, Antonio

Source: University of Maryland

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