预应力对斜拉桥箱梁剪力滞效应的影响  

Influence of Prestressing Force on Shear Lag Effect of Box Girder of PC Cable-Stayed Bridge

作　　者：张玉平[1] 李传习[1] 

机构地区：[1]长沙理工大学,湖南长沙410076

出　　处：《世界桥梁》2008年第4期39-41,49,共4页World Bridges

摘　　要：为了研究预应力对预应力混凝土斜拉桥箱梁剪力滞效应的影响,应用软件ANSYS建立了株洲建宁大桥斜拉桥成桥状态关于纵向和横向预应力设置与否的多个有限元模型。通过计算结果的分析和比较,论证了纵向和横向预应力对斜拉桥箱梁剪力滞效应的影响,指出在研究其顶板剪力滞效应时不能忽略纵向和横向预应力的影响,纵向预应力的合理设置可以在一定程度上削弱剪力滞效应引起的应力不均匀分布程度,纵向和横向预应力考虑与否对箱梁底板剪力滞效应影响有限。To investigate the influence of prestressing force on the shear lag effect of box girder of prestressed concrete （PC） cable-stayed bridge, this paper establishes several finite element models by means of the software ANSYS for the completion state of the cable-stayed bridge of Jianning Bridge in Zhuzhou in cases that the bridge will be provided with or not provided with the longitudinal and transverse prestress. On the basis of analysis and comparison of the calculation results, the paper verifies the influence of the longitudinal and transverse prestress on the shear lag effect of the box girder of the PC cable-stayed bridge and points out that the influence of the longitudinal and transverse prestress can not be ignored in the study of the shear lag effect in the top slab of the girder, the rational arrangement of the longitudinal prestress can lessen to some extent the degree of the non-uniform distribution of stress due to the shear lag effect and the influence of consideration or ignorance of the longitudinal and transverse prestress on the shear lag effect in the bottom slab of the girder is limited.

关 键 词：斜拉桥 预应力混凝土结构 剪力滞效应 预应力 参数分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U331.41[交通运输工程—道路与铁道工程]