单索面斜拉桥活载作用下主梁剪力滞研究  

Research on Shear Lag Effect in Main Girder of Cable-Stayed Bridge with Single Cable Plane under Live Loads

作　　者：李艳凤[1,2] 梁力[1] 王福春[1,2] 

机构地区：[1]东北大学土木工程研究所,辽宁沈阳110004 [2]沈阳市市政工程设计研究院,辽宁沈阳110015

出　　处：《沈阳建筑大学学报（自然科学版）》2013年第2期264-269,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51204035);辽宁省交通厅重点科研项目(0408-2)

摘　　要：目的研究单索面斜拉桥主梁成桥阶段均布车载及偏载对控制截面最大正弯矩加载情况下,截面的受力特性和剪力滞效应.方法以沈阳某单索面斜拉桥为研究背景,采用有限元理论,通过建立空间有限元模型进行分析.结果在车辆荷载作用下,主梁各板产生横向弯曲正应力及剪应力,引起截面应力发生变化,对控制截面最大正弯矩加载时,各控制截面剪力滞系数为1.28～1.49.结论偏载作用下使得箱梁截面应力分布很不均匀,但其应力量值小于均匀车载作用下的应力水平,偏载工况并不控制箱梁截面设计.对于大跨径混凝土斜拉桥,恒载所占比例偏高,仍是主要影响因素.The paper aims to research and analyzse characteristics and the shear lag effect in main girder of cable-stayed bridge with single cable plane under the max positive moment effected by the live load forces. It was based on a single cable plane cable-stayed bridge in shenyang as the research background, using the finite element theory, through the establishment of space finite element model. The results show the section produces lateral bending normal stress and shear stress. The shear lag coefficient is 1.28-1.49 under the max positive moment effected by the vehiclar forces. Partial load effect makes the section stress distribution is not uniform, but the stress is less than under the uniform vehiclar load, partial load condition does not control the box girder section design. For long-span concrete cable-stayed bridge, dead load proportion at high proportion. is still the main influence factors.

关 键 词：单索面斜拉桥 主梁 剪力滞效应 活载 最大正弯矩 有限元分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]