中文摘要：

通过建立AC＋PCC复合式路面结构三维有限元模型,基于正交试验设计选取计算参数组合,分析了RoadMesh钢丝网层间加筋前后的路表弯沉值l、AC加铺层层底的最大拉应力σa和最大剪切应力τa及PCC板顶最大弯沉差Δl等4个主要力学响应的变化规律。研究结果表明,在高等级公路中,标准轴载作用的最不利荷位为4块PCC板相交的板角处;RoadMesh加筋后对l的减小幅度不大,设计时可忽略其对弯沉的作用;RoadMesh加筋后σa,τa和Δl都较加筋前有明显的降低,且使σa和τa分布更均匀,并减小了下承层对τa的影响,但Δl对PCC板和接缝的敏感性增加,显示了其阻裂效应。因此,RoadMesh钢丝网加筋可有效阻止AC加铺层的应力集中并加强层间结合,从而提高了AC＋PCC复合式路面结构的抗反射开裂和抗剪切推移能力。

英文摘要：

Through building the 3D finite element model of AC＋PCC composite pavement structure and selecting the combinations of calculation parameters based on the orthogonal design,the paper has analyzed the change laws of four main mechanical responses at pre and post reinforced with RoadMesh steel mesh,including the deflection l at the top of pavement,the maximum tensile stressσaand the maximum shear stressτaat the bottom of AC overlay,and the maximum deflection differenceΔl at the top of PCC slab.The results show that the worst load location of standard axle loading is at the intersecting slab corner of four PCC slabs in high-grade highway.After the RoadMesh reinforcement,the amplitude of l decreases little,and its action on deflection can be ignored in the design.All theσa,τaandΔl at post reinforced with RoadMesh are obviously reduced than that at pre reinforcement to make more uniform for the distributions ofσaandτa.The effects of sub-layer onτaare de-creased,but the sensitivity ofΔl on PCC slabs and joints is increased to indicate the crack arresting effect of RoadMesh.Therefore,the reinforcement with RoadMesh steel mesh can effectively prevent the stress concentration in AC overlay and strengthen the interlayer bonding to improve the capacity of reflection crack resistance and shear slip resistance for the AC＋PCC composite pavement structure.