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针对目前桥梁火灾的频发现象和灾后桥梁的服役功能,研究了桥梁火灾特点与破坏特征。基于火灾场不同材料、不同力学参数对温度的损伤敏感度和结构不同部位的损伤对结构性能的影响程度,建立不同部位损伤权重系数,通过调节权重向量确定损伤敏感因子和最不利位置,提出了桥梁火灾后网分评价方法和混凝土桥梁火灾后抗力耐久性损伤评估模型。并利用有限程序对相关实例进行数值分析,对其耐久性进行了评定。结果表明:耐久性评估模型准确可靠,所得数据明确;网分评价法可对火灾后桥梁结构进行安全评价,也可对重大结构进行长期健康监测。
In view of the frequent occurrence of bridge fires and the service functions of post-disaster bridges, the characteristics of fires and damage to bridges are studied. Based on the sensitivity of different materials and different mechanical parameters to temperature damage and the influence of different parts of the structure on the structural performance, the damage weight coefficients of different parts were established. The damage sensitivity factor and the most unfavorable position were determined by adjusting the weight vector. Evaluation Method of Post - fire Network Classification and Damage Evaluation Model of Durability of Concrete Bridges after Fire. The finite-program is used to carry out numerical analysis on the related examples, and its durability is evaluated. The results show that the durability assessment model is accurate and reliable, and the data obtained are clear. The mesh evaluation method can evaluate the safety of bridge structure after fire and long-term health monitoring of major structures.