飞机荷载下水泥混凝土道面板应力计算方法

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

采用弹性地基板理论分析了道面板应力的主要影响因素,修正了公路标准轴载下路面板的应力计算公式,得到了飞机荷载下道面板的应力计算公式形式。采用正交设计法对道面结构参数进行安排,计算了不同道面结构在各种类型飞机荷载下道面板的应力。采用非线性回归方法对应力计算值和飞机荷载参数与道面结构参数进行分析,得到了单轮飞机荷载下水泥混凝土道面板的应力计算公式。对单轮飞机荷载应力计算公式引入荷载圆半径修正系数,并采用多元非线性回归方法,得到了双轮和双轴双轮飞机荷载下道面板的应力计算公式。利用荷载叠加原理得到多轴多轮飞机荷载下道面板应力计算公式。误差分析结果表明:回归应力计算值与有限元应力计算值相对误差不超过2%,应力计算公式具有较好的精度。

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.8 tabs,11 figs,11 refs.