论文部分内容阅读
基于预应力混凝土受弯构件冻融与疲劳交替试验,建立考虑冻融影响的混凝土抗压疲劳剩余强度概率密度模型。通过试验数据进行参数估计与假设检验,验证得出冻融循环后的混凝土抗压疲劳剩余强度仍然服从三参数Weibull分布。研究发现,冻融循环加剧了混凝土抗压疲劳剩余强度的离散性,引入冻融影响因子可表征冻融循环对混凝土抗压疲劳剩余强度分布参数的影响。
Based on the freeze-thaw and fatigue tests of prestressed concrete flexural members, the probability density model of residual compressive fatigue strength of concrete subjected to freezing-thawing was established. The parameter estimation and hypothesis test are carried out through the test data to verify that the residual compressive fatigue strength of concrete after freeze-thaw cycles still obeys the three-parameter Weibull distribution. It is found that the freeze-thaw cycle aggravates the dispersion of compressive residual fatigue strength of concrete, and the influence of freeze-thaw cycle on the distribution of compressive fatigue residual strength can be characterized by introducing the influence factors of freezing-thawing.