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.
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