高墩大跨T构桥桥墩的有限元分析

Finite Element Analysis of the High Pier of Long Span T-type Rigid Bridge

某高墩大跨 Ｔ 构桥，上部结构为预应力混凝土箱形梁，桥墩采用钢筋混凝土变截面空心墩．根据 Ｔ 构桥的结构特点，利用空间块体单元对桥跨和桥墩进行有限元离散，计算了该桥在４ 种工况下桥墩的强度与变形，给出了桥墩３ 个典型截面的应力等值线图，计算结果表明：桥梁在外荷载作用下，墩顶位移满足桥梁规范要求；桥梁在正常满荷载作用下，桥墩墩顶内部出现局部拉应力，但小于容许值；温度对墩底的应力产生较大影响，但范围较小，距墩底２ ｍ

The bridge is a prestressed concrete long span T-type cantilever girder bridge with high pier.The cross section is a prestressed concrete single box girder.The reinforced concrete pier is a hollow box pier of varying cross section.Space solid element is used to divide the bridge,in consideration of fonr different schemes,the stres and displacement analysis is presented in this paper.The equally strong stress figures of three sections are calculated.Some useful conclusions are given, which may be used as the basis of design.