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本文通过对火灾作用后的预应力混凝土结构性能进行分析,为火灾作用后的预应力混凝土结构性能评价作参考。全文通过对某预应力混凝土连续梁桥在火灾作用后的截面损伤、原材料性能、混凝土结构的微观状况进行分析,最终得出采用水冷法进行灭火时,受火的高温混凝土表面骤然降温,导致混凝土爆裂,是导致受火混凝土截面削弱的主要原因,而钢筋在火场灼烧30min后,其力学性能无明显变化。
In this paper, the fire behavior of the prestressed concrete structure performance analysis for the fire after the prestressed concrete structure performance evaluation for reference. Through the analysis of the damage of section, the performance of raw materials and the microstructure of concrete structure of a prestressed concrete continuous girder bridge after fire, the conclusion is drawn that when the water-cooling method is used to extinguish fire, the surface of high temperature concrete under fire suddenly drops in temperature, Burst, which is the main reason for the weakening of the section of fire-affected concrete, has no obvious change in the mechanical properties of the rebar after 30 minutes of burning in the fire.