弹性地基上有限尺寸复合路面板受力分析

Mechanic Analysis of Limited Dimensional Composite Pavement on Elastic Foundations

目的为求解混凝土路面上覆沥青层复合结构路面板角弯沉和最大应力.方法采用弹性地基上的多层薄板理论,忽略了沥青面层在接缝处水平连续性对路面承载力的影响,通过假定地基反力函数和路面板挠曲位移函数,得出了板角作用荷载时有限尺寸分离式路面和结合式路面的求解方法.应用该方法对均布圆形荷载作用下双层地基上的沥青-混凝土复合路面进行了分析.结果采用地基反力和位移函数方程求解有沥青上面层混凝土路面板角最大应力和弯沉,其混凝土板角最大弯沉值及最大拉应力与ANSYS有限元分析结果基本一致.能够获得较为满意的结果.结论自重对板角应力基本没有影响,对弯沉及位移函数曲线形状影响很小,可忽略不计.

Highway pavements are all multi-layer structure with seams, and are limited dimensional rigid slab on elastic half-space foundation. Finite element analysis method was adopted to provide design equations according to the stress in the middle of longitudinal edge seam of square slab with four free edges in the Specification of Cement Concrete Pavement Design for Highway（in China）. A modified equation of cement concrete pavement＇s bearing capacity, considering the effect of asphalt surface layer, was used in designing PCC ＋ AC composite pavements. But this design method was not perfect. In the conditions above, the calculation model of limited dimensional multi-layer composite pavements on double layer foundation was founded. The theory of multi-layer thin-walled plate on elastic foundation was adopted to solve the limited dimensional bonded and unbonded composite pavement with load applied on the corner of square pavement slab by assuming reaction force functions of foundation and bending deflection functions of pavement slab. And the effects of asphalt surface layer＇s continuity over the seams of concrete slab to bearing capacity of whole composite pavement were ignored. As an example, the asphalt and concrete two-layer composite pavement on a double composite foundation under uniform circular load was analyzed according to this method. The calculated deflection and ultimate tension stress in the corner of limited dimensional square concrete slab agree well with the ANSYS finite element analysis results.