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通过拉伸试验,研究20,100,200,300,400,500,600,700,800,900,1 000℃高温冷却后HRBF500钢筋屈服强度、极限强度、弹性模量、延伸率和受拉应力-应变关系的变化规律。结果表明,高温冷却后细晶钢筋,温度历程低于500℃时,钢筋的力学性能变化不明显;高于500℃时,随温度历程的升高,钢筋的应力-应变关系曲线逐渐软化,钢筋的各项力学指标逐渐退化。基于试验数据,提出了高温后500 MPa细晶粒钢筋屈服强度、极限强度和弹性模量随温度变化的计算公式,为开展细晶粒钢筋结构抗火性能分析及火灾后损伤评估提供基础性素材。
Tensile tests were carried out to study the variation of yield strength, ultimate strength, elastic modulus, elongation and tensile stress-strain relationship of HRBF500 steel after 20,100,200,300,400,500,600,700,800,900,1000 ℃ high temperature cooling. The results show that the mechanical properties of the rebar are not obvious when the temperature is lower than 500 ℃ after the high temperature cooling. When the temperature is higher than 500 ℃, the stress-strain curve of the rebars softens gradually with the increase of temperature history, The various mechanical indicators gradually degenerated. Based on the experimental data, the calculation formulas of yield strength, ultimate strength and elastic modulus with temperature of 500 MPa fine grain steel after high temperature are put forward, and provide basic materials for fire resistance analysis and fire damage assessment of fine grain steel structure .