刚性路面接缝传力杆挠度解析计算

Analytic Solution of the Deflection of Dowel Steel in Rigid Pavement Joint

采用能量变分原理推导了双参数地基梁平衡微分方程以及相应的边界条件,进而求得基于双参数地基梁理论的传力杆挠度解析通解.通过算例与传统单参数地基梁理论计算结果进行了比较,表明与单参数地基相比,双参数地基更能真实模拟刚性路面中混凝土对接缝传力杆的支承和约束,单参数地基是双参数地基的特例,传力杆受力分析时,剪切力和弯矩对传力杆挠度的影响同等重要,传力杆受力分析中,杆端弯矩和剪切力应同时考虑,传力杆宜采用弯剪梁模型.

Equilibrium differential equation and boundary condition were deduced first, adopting variation principle, and then the analytic generic solution of the deflection of dowel steel was obtained. The results near to real condition were gained through examples, compared with traditional analysis results based on single-parameter foundation theory. The supporting and restraint condition of dowel steel in rigid pavement joint could be simulated more truly with double-parameter foundation model than with single-parameter foundation model. The single-parameter foundation model is one special case of the double-parameter foundation model. The bending and shearing beam model should be adopted when the bearing dowel steel was analyzed, and the influence of the shearing force and moment on the deflection of dowel steel was equally important,which should be considered at the meantime in the analysis of dowel steel. The bending shearing beam model can be used to simulate the dowel steel.