多孔水泥基混凝土疲劳方程的建立及应用

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。

FORMULATION AND APPLICATION OF FATIGUE EQUATION FOR POROUS CEMENT CONCRETE

Porous concrete, serving as the base of a cement concrete or a bituminous pavement, should withstand the repeated actions of traffic and temperature together with the road surface. Therefore, the fatigue characteristic was considered in pavement stress analysis and structure design. Based on indoor flexural tensile fatigue tests of small beams, through analyzing the probability distribution of the fatigue life, it was proved that the fatigue life of the porous concrete obeys two-parameter Weibull distribution, and two types of fatigue equations were formulated under different stress level and equivalent stress level. The load fatigue stress coefficient used in the load stress calculation for the porous concrete as undersurface of the cement concrete pavement were derived. The tensile strength structure coefficient used in the tensile stress check for the porous concrete as the base of an asphalt pavement, and the axle load conversion model used in pavement structure design was put forward.