轴载与温度作用下水泥路面板的变形与应力分析

水泥路面板沿厚度存在温度梯度时，水泥路面板将出现翘曲变形（板角翘曲或板中翘曲），由于自重和约束的作用板内将存在温度翘曲应力，目前我国水泥路面设计中主要考虑温度应力和荷载应力的叠加造成的水泥路面板底－板顶产生的横向开裂，计算中并未考虑轴载和温度共同作用下水泥路面的应力和变形。文中通过有限元方法，建立模型，对单自由板在轴载和温度共同作用下的变形和应力进行了计算，计算中考虑了正向和负向温度梯度和轴载作用板不同位置时的工况，计算结果表明不同工况下水泥路面板最大应力将发生变化，将造成板不同的开裂方式。

Deflection and Stress Analysis of a Pavement Slab under Temperature Gradient and Axial Loading Coupling

It has been established that a pavement slab will curl up if a temperature gradient exists across the depth of a slab. A negative temperature gradient causes the slab edge to curl up while a positive temperature gradient curls up the slab center. Temperature stress in slabs is induced by self-weight and other slab constraints. At present in P. R. China, the total stress considered in cement concrete pavement design includes the load stress plus the temperature stress, and only transverse cracking from bottom to top is considered for concrete pavement. Slab responses under axial loads and temperature gradient coupling are not included. We modeled a single slab with a frictionless interface between the slab and foundation using the finite element method. Slab deflection and stress were calculated under axial loads at different slab positions and negative or positive temperature gradient coupling. The calculated results show that the different conditions of axial loads and temperature gradient coupling will change the maximum tension and cause various types of cracks in a slab.