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作为水泥混凝土或沥青路面基层的多孔混凝土和面层一起受到荷载和温度的反复作用,因此,在路面应力分析和结构设计中需考虑它的疲劳性能。在多孔混凝土小梁弯拉疲劳实验的基础上,通过分析疲劳寿命实验数据的概率分布,得出其疲劳寿命服从双参数Weibull分布,并依次回归出不同应力水平和等效应力水平下两种形式的疲劳方程。根据疲劳方程提出了以多孔混凝土作为水泥混凝土路面下面层应力计算的荷载疲劳应力系数,沥青路面基层层底拉应力验算的抗拉强度结构系数,建立了进行路面结构设计的轴载换算模型。
Porous concrete, which is the base of cement concrete or asphalt pavement, is repeatedly subjected to load and temperature together with the surface layer. Therefore, its fatigue performance must be considered in the stress analysis and structural design of pavement. Based on the bending fatigue experiment of porous concrete beam, the fatigue life of the porous concrete beam is analyzed by analyzing the probability distribution of the fatigue life test data. The fatigue life follows the two-parameter Weibull distribution, and the two forms under different stress levels and equivalent stress levels The fatigue equation. According to the fatigue equation, the load fatigue stress coefficient calculated by porous concrete as the stress of the lower layer of cement concrete pavement and the tensile strength coefficient calculated by checking the tensile stress at the base of the asphalt pavement are put forward, and the axle load conversion model for pavement structure design is established.