Seismic-explosion risk-based robustness index of structures

Nowadays public buildings, located in residential areas, are occasionally affected by unwanted and unexpected events. Structural robustness makes balance between local damages and comprehensive ones. This study suggests a new method to evaluate the risk-based robustness index in structures. Two critical events, namely earthquake and blast, are considered to evaluate the risk-based robustness index, both of which are regarded as compatible and interdependent so that an earthquake-related blast happens simultaneously or a little after the quake and as a result of gas leak or damage in mechanical and thermal facilities. Based on uncertainty parameters in both critical events, risk-based robustness index (as a result of earthquake and blast) also called "seismic-explosion risk-based robustness index”, is brought up by generating scenarios. Finally, in order to understand this method better, the article gives an example to evaluate this index on a reinforced concrete moment frame building. Eventually the results of this analysis are discussed.