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文章以株洲建宁大桥斜拉桥为工程背景,建立了该桥主梁最大双悬臂、主梁最大单悬臂和成桥状态3个工况的空间有限元模型,通过计算结果的比较分析,研究了斜拉桥单箱三室主梁剪力滞效应,并经实桥测试验证了有限元数值计算结果。计算结果表明:斜拉桥单箱三室主梁部分箱梁截面顶板剪力滞效应显著;部分箱梁截面顶板最大应力出现在翼缘悬臂端;与顶板相比,箱梁底板剪力滞效应不明显;部分箱梁截面施工过程中的剪力滞效应较成桥状态显著。针对斜拉桥单箱三室主梁剪力滞效应的特点,提出用截面正应力分布曲线或剪力滞系数曲线表述其剪力滞效应的方法,对同类型桥梁箱梁设计提出了一些建议。
Taking the cable-stayed bridge of Jian-ning Bridge in Zhuzhou as an example, the paper establishes the space finite element model of the maximum double cantilever of the main girder, the maximum single cantilever of the main girder and the three conditions of the completed bridge. Through the comparative analysis of the calculated results, The shear lag effect of the single girder of the three-compartment cable-stayed bridge was verified and the finite element numerical results were verified by the real bridge test. The calculation results show that the shear stress of roof section of box girder of single box three-room main girder of cable-stayed bridge is significant, and the maximum stress of roof section of some box girders appears on the cantilever side of flange. Compared with the roof, the shear lag effect of box girder floor is not Obviously, the shear lag effect during the construction of some box girder sections is more significant than that of the completed bridge. Aiming at the characteristics of shear lag effect of single-girder main-girder of single-box cable-stayed bridge, this paper presents a method of describing the shear lag effect by using the curves of normal stress distribution curve or shear lag coefficient, and puts forward some suggestions for the same type of box girder design.