Calculating methods of stress for cement concrete pavement slab under plane loads

With elastic base theory, the main influence factors of stress for pavement slab under plane loads were analyzed, the calculating formula form of stress was deduced by modifying the stress formula of highway pavement under standard axis load.Pavement's structural parameters were organized by orthogonal design method, and the stresses under different combinations of plane loads and pavement structures were calculated by FEM.The stresses and parameters were analyzed by nonlinear regression method, and the calculating formulae of stress under single wheel plane load were got.By introducing the modifying coefficient of load radius, the calculating formulae of stress under dual-wheel and dual-wheel-dual-axes plane loads were deduced by nonlinear regression method.The calculating formulae of stress under multi-wheel-multi-axes loads were deduced by combined load theory.Error analysis result indicates that the relative errors between the calculating results by nonlinear regression method and FEM are less than 2%, so the stress formulae have high precision.