大跨径连续刚构桥主墩的合理刚度分析

Analysis of Rationality Rigidity of Piers for Long-span Continuous Rigid Frame Bridge

以大跨径刚构桥主墩刚度的作为研究对象,分析主墩刚度计算方法,利用有限单元法,对典型桥梁主墩在不同的设计参数下的内力、位移和稳定荷载系数进行计算分析.归纳出大跨径连续刚构桥主墩类型、主墩截面设计参数(纵桥向宽度)的确定公式,分析在悬臂施工中的不平衡弯矩所需两薄壁墩抗弯刚度的两墩间距和系梁的数设置对桥跨结构内力、位移及稳定性影响.总结出主墩类型及设计参数的规律性.

The rigidity of piers for long-span rigid frame bridges is studied by finite element method in this paper. Large numbers of design data of piers are collected for the long-span rigid frame bridges which have been built. The width of the double thin-wall pies in the longitudinal direction of bridge is deduced to satisfy the flexibility. The spacing of the double thin-wall piers derived from unbalanced moment in construction is deduced. Through comparison and classifying, the results indicate that the types of piers, their design parameters and the number of tie-girders vary with the span and the height of piers. The relationship of the internal forces, the displacement and the stability coefficient to the type of piers, the design parameters of piers and the number of tie-girders are summarized.