广义变分原理在高速铁路无缝道岔结构分析中的应用

APPLICATION OF GENERALIZED VARIATIONAL PRINCIPLES TO WELDED TURNOUT STRUCTURES OF HIGH-SPEED RAILWAY

在继承现有试验成果的基础上,将广义变分原理应用于铁路无缝道岔结构体系的分析,提出了一种新的铁路无缝道岔计算理论。建立了较为完善的计算模型,在假设钢轨纵向位移函数的基础上,计算了无缝道岔结构体系各部分的能量,通过广义变分法建立了结构体系的平衡方程,编制了计算程序,分析了固定辙叉无缝道岔钢轨温度力与位移。为无缝道岔计算理论和设计方法的研究开辟一条新途径。

Based on existing experimental data and energy variation principle, generalized variational principle is used to analyse welded turnout structures of railway, and a new method for calculating welded turnout structures is presented. In the model, sleepers are regarded as finite long beams on continuous elastic foundation base, and the relation between rail forces and sleeper displacements is established by analysis of sleeper forces. The energy of welded turnout structures is computed based on assumed longitudinal displacement function of rail. By means of generalized variational methods, the equilibrium equation is derived. The additional temperature forces and the expanding and contracting displacements of the inner rails are analysed. This paper opens a new avenue for welded turnout calculation theory and design method.