北京市南三环东铁营桥火灾后桥梁加固研究

Study on Reinforcement of South Ring Ⅲ Dongtieying Bridge after Fire in Beijing

桥梁在火灾高温下,构件混凝土局部爆裂、露筋,使混凝土和钢筋的强度及变形性能劣化,结构承载力降低。现结合北京市南三环东铁营桥火灾后检测评估实例,运用火灾中混凝土桥梁破坏机理,研究过火构件设计加固方案。其方法和思路可为处理类似混凝土桥梁火灾受损评定与加固提供有益的参考。

Under the high temperature of fire,the component concrete of bridge will locally burst with the exposed bar to make the strength and deformation performance of concrete and reinforcing steel bar degraded,and the bearing capacity of structure reduced.Based on the practical case of detection evaluation of Beijing South Ring III Dongtieying Bridge after fire,the failure mechanism of concrete bridge in fire is used to study the reinforcement design scheme of fired components.The method and idea can provide the beneficial reference for handling the fire damage evaluation and reinforcement of the similar concrete bridges.