Document Type : Article
Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur 711103, India
Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur 711103, India.
The seismic risk of reinforced concrete building frame located in the Guwahati City of northeast India is evaluated. To do so, we first conduct a site-specic 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 artificial 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 dierent 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.