ANALYTICAL STUDY ON MAXIMUM TEMPERATURE ESTIMATION FOR STEEL BRIDGE SUBJECTED TO A FIRE

抄録

 In recent years, there have been many reports of bridge fire incidents caused by either accidental or deliberate actions, vehicle accidents, etc., in Japan and overseas. When bridges are exposed to fire, it is necessary to promptly and accurately judge the state of damage and serviceability, and to aim to open bridges as soon as possible. However, a diagnostic method for fire-exposed bridges have not been established yet, and reports and research data on steel bridge fires are inadequate. In this study, a parametric analysis was carried out assuming that fire occurs in a riverbed below the steel girder through numerical simulation by CFD and heat transfer analysis by FEM. Based on the maximum temperature characteristics in the steel bridge subjected to a fire, which are obtained from the analysis, a simple estimation model of the maximum temperature of the steel bridge is proposed.