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采用自行开发的低温夹具,对6根钢筋混凝土梁在-180℃~20℃温度下进行了单调静力加载试验。通过试验,研究了低温下钢筋混凝土梁的破坏模式和破坏机理,分析了温度对梁受弯性能的影响。结果表明,钢筋混凝土梁的承载力随温度的降低而增大,和室温相比,温度在-40℃、-80℃、-120℃、-160℃、-180℃时,开裂荷载分别提高23.2%、66.0%、77.3%、112.4%和187.6%;屈服荷载分别提高39.4%、52.1%、124.6%、147.5%和205.6%;极限承载力分别提高26.5%、39.4%、91.5%、112.3%和160.6%。根据超低温材料性能及钢筋混凝土梁受弯性能的试验结果,给出了超低温下梁截面受弯承载力的计算公式。
Using self-developed low-temperature fixtures, six reinforced concrete beams were subjected to monotonic static loading at -180 ℃ ~ 20 ℃. Through the experiment, the failure mode and failure mechanism of the reinforced concrete beam at low temperature were studied, and the influence of temperature on the beam bending performance was analyzed. The results show that the bearing capacity of RC beams increases with the decrease of temperature. Compared with room temperature, the cracking load increases by 23.2% at -80 ℃, -120 ℃, -160 ℃ and -180 ℃, respectively The yield strength increased by 39.4%, 52.1%, 124.6%, 147.5% and 205.6%, respectively, and the ultimate bearing capacity increased by 26.5%, 39.4%, 91.5% and 112.3%, respectively 160.6%. According to the test results of ultra-low temperature materials and the flexural behavior of reinforced concrete beams, the formulas for calculating the flexural bearing capacity of beams under ultra-low temperature are given.