AN EVALUATION OF MULTI-HAZARD RISK SUBJECTED TO BLAST AND EARTHQUAKE LOADS IN RC MOMENT FRAME WITH SHEAR WALL

Over the recent decades, many public buildings located in a region of highseismic hazard have been subjected to simultaneous effect of abnormal loads against which they were not specifically designed. Hence, it is necessary to investigate the critical events occurring on the structure during its lifetime in order to investigate the structure’s performance based on a multi-hazard approach. The current study proposes a probabilistic framework for multihazard risk associated with collapse limit state of RC moment frame with shear wall structure, which is subjected to blast threats in the presence of seismic risk. The annual risk of structural collapse is calculated taking into account both the collapse caused by an earthquake event and the blast-induced progressive collapse. The blast fragility is calculated using a simulation procedure of Monte Carlo for generating blast scenarios. As a case study, the blast and seismic fragilities of a generic eight-story RC moment frame with shear wall building located in high seismic zone and subjected to the effect of blast load are calculated and implemented in the framework of a multi-hazard risk. The findings of the current research show a considerable risk; finally, the importance of taking the blast measure into account when designing strategic structures in areas of high seismic risk is highlighted.