弹性约束高墩的稳定性分析

Stabilization Analysis of High Piers Constrained by Bridge Beam

实际工程中桥梁上部结构的约束对桥墩的稳定计算具有不可忽略的作用,从能量原理出发,推导出了考虑墩顶受桥梁弹性约束的高墩失稳临界力的计算公式,并建立有限元模型验证了公式的正确性,同时分析了墩顶约束刚度、墩高和桥墩直径对高墩稳定性的影响。该公式计算简单,精确度高,能满足工程需要,可为设计人员提供参考。

Because restriction effect of upper bridge to high piers couldnot be neglected,the critical force calculation formulas of pier restrained on its top by bridge beam were derived based on energy method. Then finite element analysis is used to established models to verify the present approach,while the influence of the constraint stiffness ,height and Diameter of piers to stability of high piers is analysised. The calculation formula presented in this paper is simple in computation,high in precision and can be used for the designer＇s re ference.