结构设计要考虑刚度问题,桥墩设计也不例外,《铁路工程技术规范》明确规定,计算墩顶侧移⊿系将桥墩视作一固定于下端基础顶,上端墩顶为自由端之悬臂梁。不论其荷载情形如何,⊿可用下列虚功方程计算之上列方程在任何超静定结构学中均述及,故无须导演与解释。本文只讨论我国铁路桥梁广泛采用的截面为圆形、矩形、圆端形的直线楔形实体圬工桥墩,这种桥墩沿墩高各点上的墩身截面均不相同,(A)式须用部分分式的方法进行积分,其计算常不易求得或不能求得,为此以前采取了两种办法: 一为近似求积分的“梯形规则”其精确性颇差,且手续麻烦。铁道部第四勘测设计院主 Structural design to consider the stiffness problem, pier design is no exception, “Railway Engineering Specifications” clearly stipulates that the calculation of piers lateral displacement of the bridge piers as a fixed at the bottom of the top, top of the pier is the free end of the cantilever beam. Regardless of its loading conditions, 上 The above equations, which can be calculated using the following virtual work equation, are addressed in any statutory structure, so there is no need for directing and interpreting. This article only discusses the linear wedge-shaped solid piers with circular section, rectangular section and round section, which are widely used in railway bridges in China. The cross section of the piers on each point along the pier height is different. (A) Part of the fractional method of integration, the calculation is often not easy to obtain or can not be obtained, for which two approaches have been taken before: one for the approximate integral of the “trapezoidal rule” its accuracy is poor, and the procedures cumbersome. Ministry of Railways Survey and Design Institute fourth master