Comprehensive safety assessment for CFST tied arch bridge subjected to explosion

Accidental vehicle explosion and car bomb blast causes certain damage to bridge structure, while studies on safety assessment for bridge structures subjected to blast are limited, especially for the concrete filled steel tube(CFST) tied arch bridge(tied arch bridge in short). This study developed a safety assessment index system for CFST tied arch bridge under explosion by the modified analytic hierarchy process(AHP) model based on catastrophe theory. The Jinta bridge was used as a demonstration case for this study and the dynamic responses of tied arch bridge under explosion loading was simulated by numerical simulations. The results show that the proposed system can reflects the safety condition of the tied arch bridge after explosion. The evaluation system presented in this study can serve as an approach for the safety assessment of tied arch bridge and provide the basis for engineering decision-making of bridge structures after explosion accident.