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本文对30个混凝土T形截面柱体和40根钢筋试件在常温100～800℃范围内的不同温度和荷载同时作用下的强度、变形、弹性模量和应力-应变关系等进行了实验和理论研究工作。探讨了高温和荷载共同作用下的变化规律,着重分析了不同温度和荷载共同作用下的破坏特征,及其对钢筋和混凝土的弹性模量、极限拉压应变、强度等的影响和应力-应变关系,经过理论分析和推导,建立了简洁实用的公式,并用计算机计算,表明计算与试验结果符合较好。此外,本文也讨论了钢筋试件在受不同温度作用后,进行冷却一昼夜,然后再进行加载的情况。
In this paper, the strength, deformation, elastic modulus, and stress-strain relationship of 30 concrete T-section columns and 40 rebar specimens at different temperatures and loads from 100 to 800°C at room temperature were tested. Theoretical research work. The change law under high temperature and load is discussed. The damage characteristics under different temperature and load are analyzed, and its influence on the elastic modulus, ultimate tensile strain, strength, etc., and stress-strain of reinforced concrete and concrete are emphatically analyzed. Relations, through theoretical analysis and derivation, established a simple and practical formula, and calculated by computer, indicating that the calculation and test results are in good agreement. In addition, this article also discusses the situation where the steel bar specimens are cooled for a whole day and night after they are subjected to different temperatures, and then loaded.