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采用气冻气融方式,对足尺(150mm×300mm×2 700mm)钢筋混凝土梁的抗冻性进行了研究,分析了冻融对试件相对动弹性模量、损伤层厚度、抗压强度及质量的影响,并研究了浸泡时间及钢筋对超声测试结果的影响;同时,研究了冻融对钢筋混凝土梁极限承载力的影响,并建立了气冻气融环境下钢筋混凝土梁的承载力退化模型.结果表明:随着冻融循环次数的增加,梁构件的相对动弹性模量、极限承载力及其混凝土芯样抗压强度降低,损伤层厚度增加,冻融循环150次时,其相对动弹性模量降至0.54,极限承载力降至未冻融时的86.7%,芯样抗压强度降至未冻融时的55%.
The frost resistance of full scale (150mm × 300mm × 2 700mm) reinforced concrete beams was studied by means of gas-air freezing method. The effects of freeze-thaw on the relative dynamic elastic modulus, damaged layer thickness, compressive strength and The influence of the immersion time and the reinforcement on the ultrasonic test results was also studied. Meanwhile, the influence of the freeze-thaw on the ultimate bearing capacity of the reinforced concrete beam was studied and the bearing capacity degradation of the reinforced concrete beam under the gas- The results show that the relative dynamic elastic modulus, ultimate bearing capacity and compressive strength of concrete core sample decreases with the increase of the number of freeze-thaw cycles, and the thickness of damaged layer increases. When the freeze-thaw cycle is 150 times, The dynamic modulus decreased to 0.54, the ultimate bearing capacity decreased to 86.7% without freezing and thawing, and the core compressive strength decreased to 55% without freezing and thawing.