Seismic performance of reinforced concrete building in Guwahati city, northeast India

The seismic risk of reinforced concrete building frame located in the Guwahati City of northeast India is evaluated. To do so, we fi rst conduct a site-speci c probabilistic seismic hazard analysis to obtain hazard curve and implement proper selection of ground motion records for nonlinear time history analyses (NLTHA). Subsequently, the NLTHA of the building frame is performed to obtain the drift demand for any particular ground motion level. As the recorded accelerograms in the region are limited, the synthetic and artifi cial ground motion data are also generated to supplement the data base. Thereafter, the probabilistic structural capacity parameters at various limit states are obtained from random pushover analyses. Based on the knowledge of seismic hazard, demand, and capacity parameters, fragility curves are obtained corresponding to di erent structural performance levels. The annual probability of failure of the representative example frame is also estimated. The results of the seismic risk analysis indicate that a medium-rise reinforced concrete building frame in the study area with moderate fundamental period is most likely to perform beyond its elastic range. However, such structures designed according to the Indian codes are expected to be sufficient enough to prevent life-threatening risk and complete collapse.