单索面斜拉桥活载作用下主梁负剪力滞效应研究  

Research on negative shear lag effect in main girder of cable-stayed bridge with single cable plane under the live load forces

作　　者：李艳凤[1,2] 梁力[1] 王福春[2] 

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

出　　处：《应用力学学报》2013年第2期268-272,308,共5页Chinese Journal of Applied Mechanics

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：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研究了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负弯矩加载情况下截面的受力特性和负剪力滞效应。结果表明:在车辆荷载作用下,主梁各板产生了横向弯曲正应力及剪应力,使截面应力发生了变化;对控制截面最大负弯矩加载时,各控制截面剪力滞系数为0.64～0.983,主梁截面出现负剪力滞效应。偏载作用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。A single cable plane cable-stayed bridge in shenyang is taken as the research background,space finite element model is establised by using the finite element theory,characteristics and the negative shear lag effect in main girder of cable-stayed bridge with single cable plane under the maximum negative moment affected by the live load forces are analyzed.Results obtained show that the section produces lateral bending normal stress and shear stress affected by the vehicular forces.The shear lag coefficient is 0.64~0.983 under the maximum negative moment and there is negative shear lag effect in main girder section.Partial load effect makes the section stress distribute nonuniformly,but the stress is less than that under the uniform vehicular load,therefore partial load condition does not control the box girder section design.

关 键 词：单索面斜拉桥 主梁 剪力滞效应 活载 最大负弯矩 有限元分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]