某公路立交火烧桥承载能力评估及加固设计

Evaluation and reinforcement design of the carrying capacity of a highway overpass fire bridge

某拉载汽车化油器清洗剂的半挂车在经过桥下时发生燃烧,引燃装载物发生爆炸,对该桥第4孔、第5孔上部结构、下部结构、桥面系造成较大损伤。该桥进行外观检测及荷载试验,结果承载能力满足原设计要求,但火灾高温对桥梁有一定程度的影响,受火灾影响严重的空心板梁安全储备有所降低。因此提出了通过粘贴碳纤维板+嵌入碳纤维筋的加固方法,使结构承载能力安全储备得到提高,从而达到桥梁满足安全通行的要求。

A semi-trailer carrying a car carburetor cleaner caught fire while passing under the bridge,igniting the load and causing an explosion,resulting in significant damage to the upper and lower structures of the 4th and 5th holes of the bridge and the bridge deck system.The bridge underwent visual inspection and load testing,and the bearing capacity met the original design requirements.However,the high temperature of the fire had a certain impact on the bridge,and the safety reserve of the hollow slab beams,which were severely affected by the fire,was reduced.Therefore,a reinforcement method of pasting carbon fiber boards and embedding carbon fiber reinforcement bars was proposed to improve the safety reserve of the structural bearing capacity,thereby meeting the requirements for safe passage of the bridge.