结合实例对异型桥梁结构分叉位置不同时的受力分析  

Optimization Analysis of the Bifurcation Position on Irregular Bridge Structures Based on Examples

作　　者：宋磊[1] 齐承涛[1] 

机构地区：[1]西安市政设计研究院有限公司,710068

出　　处：《特种结构》2013年第3期22-26,共5页Special Structures

摘　　要：立交桥多属于跨线构造物,为满足道路线型要求,立交桥多包含有曲线异型变宽的桥型结构,其跨径组合往往不能按结构的合理跨径进行布置,使得桥梁的受力状态复杂。针对西安枣园路立交中的异型桥梁,拟定6种构型方案,应用梁格法理论构建其有限元模型,分析了在不同工况下6种构型的静力及基频,确定出其各自的特性,进而分析了该立交桥匝道的分叉点位置及分叉箱梁长度的特点。研究方法可为同类结构的设计与施工提供参考,具有一定的工程应用价值。The flyover often belongs to the bridge structure with nonuniform width curve, To meet the dif- ferent highway construction requests, most of flyovers are designed as bridges with curvilinear and irregular broadened bridge shape, leading to a complex stress state because of irregular arrangement among built-up spans. Taking the irregular structure of Xi＇an ZaoYuan Road interchange bridge for an example, six structural strategies of this bridge are brought forward. The finite element analysis （FEA） models of the strategies based on beam-grid theory are made to gain static stresses and basic frequencies under different load conditions. The optimization scheme is determined by comparing the analysis results. That is, the bifurcate node and bifurcate length of irregular box girder are ascertained. The study in this paper may provide some reference for other similar structural designs and constructions, and certain practice value.

关 键 词：立交桥 异型连续箱梁 梁格法 结构优化 

分 类 号：U441[建筑科学—桥梁与隧道工程]