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以某高速公路空心板桥为工程背景,根据火灾后该桥表观检测、荷载试验及有限元分析,研究了火灾后烧损桥梁的力学性能退化规律。由于桥梁烧损区域相对较小且火灾持续时间较短,承载能力变化不大,整体受力安全;但桥梁烧损后,刚度退化较为明显,当火灾温度低于400℃时,桥梁烧损后刚度相对较小,高于400℃时,刚度退化速率增大。研究成果可为桥梁火灾后鉴定及加固提供技术依据。
Taking the hollow slab bridge of an expressway as the engineering background, according to the apparent inspection, load test and finite element analysis of the bridge after the fire, the degradation of mechanical properties of the bridge after fire was studied. Due to the relatively small burning area of the bridge and the short duration of the fire, the bearing capacity does not change much and the overall stress is safe. However, the rigidity degradation of the bridge is obvious when the fire is damaged. When the fire temperature is below 400 ℃, Stiffness is relatively small, higher than 400 ℃, the stiffness degradation rate increases. The research results provide technical basis for the identification and reinforcement of bridges after fire.