SIGNIFICANCE OF EARTHQUAKE INCIDENCE ON RESPONSE OF PLAN-IRREGULAR INFILLED R/C BUILDINGS

Abstract eng:
Masonry infilled R/C buildings present a number of complexities inherent to inplan eccentricities and asymmetric layout of infills. Their dynamic earthquake response cannot generally be characterized in terms of principal directions of deflection as for planregular structures. The response is then complicated by nonlinear frame-infill interaction, which makes the resulting collapse mechanism particularly sensitive to local shear failures. A three-dimensional nonlinear model is developed incorporating frame elements, eccentric infill struts, and shear-prone short columns. Results from nonlinear Response History Analyses (RHA) changing the earthquake incidence are analyzed starting from Graphic-Dynamic modal torsional trends and directional inelastic response envelopes. Directional Incremental Dynamic Analyses (IDA) and Uncoupled Modal Response History Analyses (UMRHA) over a range of hazard levels (OP, DL, SD, NC) highlight the polarization of the elastic and inelastic modal response. 1

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