论文部分内容阅读
针对北方寒冷地区路面水泥混凝土在荷载、低温、干燥条件下的疲劳后剩余弯拉强度和疲劳寿命进行研究,以获得三因素作用下路面混凝土疲劳损伤机理与剩余寿命预测模型,并通过试验验证其精确度。通过定义疲劳损伤变量以及构建剩余弯拉强度损伤模型,建立了剩余弯拉强度随荷载次数、低温温差作用时间和干燥作用时间的非线性数学方程,能够较好地反映疲劳后路面水泥混凝土力学性能损伤规律。引入S-N疲劳寿命曲线方程和失效概率对路面混凝土的疲劳寿命分析。结果表明,不同失效概率下采用单对数方程预测混凝土剩余寿命具有较高精度,且该条件下混凝土的疲劳寿命符合威布尔分布函数,提出了荷载低温干燥条件下路面水泥混凝土的双参数威布尔分布函数具体形式。
Aiming at the fatigue strength and residual fatigue strength of pavement concrete under the load, low temperature and dry conditions in northern cold area, the fatigue damage mechanism and residual life prediction model of pavement concrete under three factors were obtained and verified by experiments Accuracy. By defining the variables of fatigue damage and constructing the damage model of residual bending strength, the nonlinear mathematical equation of remaining bending strength with load times, temperature difference and drying time is established, which can well reflect the mechanical properties of concrete after fatigue Injury rules. Fatigue Life Analysis of Pavement Concrete with S - N Fatigue Life Curve Equation and Failure Probability. The results show that using the single logarithmic equation under different failure probabilities to predict the residual life of concrete has higher accuracy and the fatigue life of the concrete conforms to the Weibull distribution function under the different failure probabilities. A two-parameter Weibull Distribution function specific form.