Seismic vulnerability assessment of reinforced concrete haunch beam by nonlinear static and incremental dynamic analyses

This research presents a novel technique of the seismic vulnerability assessment of the reinforced concrete haunch beams in terms of the probability of exceedance of the plastic hinge rotations. For this reason, the nonlinear static and incremental dynamic analyses of various three-dimensional structures with bays have been conducted by the ETABS. The plastic hinge rotation is controlled by the collapse prevention and life safety performance levels of beams and joints, respectively. The roof displacement controls the probability of exceedance of the plastic hinge rotations of beams and joints based on the nonlinear static analysis, which is a new insight of this research. The numerical analysis of ETABS is validated with the previously published work to obtain a good agreement of validation results. The 15-storied structure with 3 bays shows a higher vulnerability and the 4-storied structure shows a lower vulnerability according to the numerical analysis. The ranges of the normalized roof displacement and the peak ground acceleration for higher vulnerability are found to be (0.38–0.56) and (0.05–0.09) g, respectively, based on the nonlinear static and incremental dynamic analyses.