引言弹性墩的刚度是桥梁静力和动力分析的最重要参数之一,它被定义为墩顶产生单位位移所需的力。为了估算桥墩的刚度,以下三点很重要:①所考虑的变形类型;②桥墩两端的边界条件;③桥墩的几何形状。就常用的桥墩而言,其长厚比都较大,因此,其弯曲变形要比由剪力引起的变形大得多。所以,可忽略剪切变形,并用Bernoulli—Euler梁理论将桥墩模拟为梁柱。就梁柱的 INTRODUCTION The stiffness of the elastic pier is one of the most important parameters in static and dynamic analysis of a bridge. It is defined as the force required to produce a unit displacement at the pier top. In order to estimate the stiffness of piers, the following three points are important: ① the type of deformation under consideration; ② the boundary conditions at both ends of the piers; ③ the geometry of piers. As far as piers are concerned, their ratio of length to thickness is larger, so their bending deformation is much larger than the deformation caused by shear force. Therefore, the shear deformation can be neglected, and the piers are modeled as beam columns by Bernoulli-Euler beam theory. On the beam