通过对4根缩尺钢筋混凝土约束梁三面受火的火灾实验,获得高温作用下的构件温度场分布,在构件常温冷却后进行了静力加载实验,并对不同火灾损伤级别的构件进行了极限承载力和刚度对比分析。结果表明,火灾损伤后钢筋混凝土约束梁承载力降低程度不大,但刚度有较大降低。文中的研究结果可为钢筋混凝土梁受火损伤后加固设计提供依据。 Through the fire experiments on three sides of four constrained reinforced concrete beams subjected to fire, the temperature distributions of the components under high temperature were obtained. After the components were cooled at room temperature, static loading experiments were carried out, and the components of different fire damage levels were limited Comparative Analysis of Bearing Capacity and Stiffness. The results show that the bearing capacity of reinforced concrete beam after fire damage is not reduced to a great extent, but the stiffness is greatly reduced. The research results in this paper can provide the basis for reinforcing design of reinforced concrete beams after being damaged by fire.