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多孔混凝土作为水泥混凝土路面或沥青路面基层时,和面层一起受到车辆荷载和温度应力的反复作用,路面应力分析和结构设计中需考虑其疲劳性能。文章在室内多孔混凝土室内小梁弯拉疲劳试验的基础上,通过分析疲劳寿命试验数据的概率分布,得出其疲劳寿命服从双参数威布尔分布,建立了不同应力水平和等效应力水平下两种形式的疲劳方程。根据得出的疲劳方程提出了多孔混凝土作为水泥混凝土路面基层进行路面结构设计的轴载换算公式。
When used as the cement concrete pavement or asphalt pavement base, the porous concrete is repeatedly affected by vehicle load and temperature stress along with the pavement. The fatigue behavior of the pavement should be considered in stress analysis and structural design. Based on the bending fatigue test of indoor cellular concrete indoor trabecular, by analyzing the probability distribution of fatigue life test data, the fatigue life is obeyed by two-parameter Weibull distribution and two different stress levels and equivalent stress levels are established The form of fatigue equation. Based on the fatigue equation obtained, the formula of axle load conversion for the design of pavement structure with porous concrete as the base of cement concrete pavement is proposed.