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在国内外研究工作的基础上,提出了适用于公路桥梁火灾研究的车辆火灾的热释放率模型,建立了公路火灾大气最高温度空间温度场。根据建立的温度场,分析了结构的温度场分布、破坏模式,得到了不同火源模型下结构的状态。综上,公路火灾最不利状态下会对桥梁的安全造成隐患,火灾如果得不到及时扑救,将使其丧失正常使用功能,严重时会导致大桥的损毁。
Based on the research work both at home and abroad, the heat release rate model of vehicle fire which is suitable for the study of highway bridge fire is put forward and the temperature field with the highest temperature of the road fire is established. According to the established temperature field, the temperature field distribution and the failure mode of the structure are analyzed, and the state of the structure under different fire source models is obtained. To sum up, under the most unfavorable road fire conditions, it will cause hidden dangers to the safety of the bridge. If the fire is not extinguished in time, it will lose its normal function and lead to the destruction of the bridge in serious cases.