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本文对19根三面加温至800℃的钢筋混凝土压弯试件进行了高温时、恒温两小时后以及降温后三种温度工况的加载试验，分析了其受力性能的差别，包括试件的破坏特征、极限承载力和变形规律等。试验结果表明，试件高温时的力学性能比常温时严重恶化，恒温两小时又对试件的承载力明显削弱，降温后的试件受力性能则与高温时的差别较小。
In this paper, nineteen RC bending specimens with three sides heated to 800 ℃ were tested under high temperature, two hours at constant temperature and three temperature conditions after cooling, and the differences of their loading performance were analyzed. Destruction characteristics, ultimate bearing capacity and deformation laws. The experimental results show that the mechanical properties of specimens at high temperatures are seriously deteriorated compared with normal temperature. The bearing capacity of specimens after two hours is obviously weakened, and the difference between the mechanical properties of specimens after cooling and that at high temperature is small.