Fire event is the one of most severe event on the bridge. Fire event on the bridge has been reported annual average 8 cases in South Korea. Especially Bucheon viaduct fire cause catastrophic damage on the traffic system. This study developed and conducted fire risk assessment for existing bridge on the highway. Entire risk assessment procedure divided into 3 sections, PRA, SRA and DRA. PRA check fire scenario possibility. SRA check key parameter of fire risk by checklist. DRA is a precision risk assessment and find what part makes bridge high risk.

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The blast damage behaviors of steel-plated and glass fiber reinforced polymer (GFRP)-plated concrete panels exposed to explosive are investigated. In order to improve efficiency and accuracy of numerical analysis, the multi-physics method of coupled Eulerian-Lagrangian discretization is used. To enhance the reliability of the simulation results, the equation of state, strength, and failure model of materials are implemented in an explicit program, AUTODYN. In particular, the implemented formulation includes the strain rate-dependent plasticity for concrete and a transversely isotropic elastic constitutive model for GFRP. The retrofitted concrete panels are compared to non-retrofitted concrete panels, and the deflection and deflection ratio are reduced by steel and GFRP plates. To validate the implemented material models and analysis method, a comparison is made with the reported experimental results. The maximum deflection of the panel from the numerical analysis agrees closely with the results of the experiments. Finally, a discussion of the numerical results with respect to code criteria and energy absorption capacity is presented.