Vertical Bending Mechanical Properties of Box Composite Girder with Corrugated Steel Webs

被引：3
|
作者：
Zhang Z. [1 ]
Jin X. [1 ]
Gan Y. [1 ]
机构：
[1] School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2019年 / 40卷 / 06期
关键词：
Accordion effect; Boundary condition; Box composite girder with corrugated steel webs; Energy variation method; Shear lag effect; Vertical bending mechanical property;
D O I：
10.3969/j.issn.1001-4632.2019.06.07
中图分类号：
学科分类号：
摘要：
In order to reveal the vertical bending mechanical properties of box composite girder with corrugated steel webs, considering comprehensively the shear lag effect, accordion effect and shear deformation, two different longitudinal displacement difference functions of shear lag were established for the top and bottom flange slabs and cantilever plates of box composite girder. Based on energy variational method, the governing differential equations and natural boundary conditions of composite box girder were deduced, and the closed-form solutions of generalized displacements were obtained accordingly. The correctness of the solution was verified through model test and the finite element analysis. The variations of shear lag effect and accordion effect under various boundary conditions were analyzed. It shows that the calculated results of the proposed closed-form solutions agree well with those by experiment and finite element method, and the stress of the bottom plate of composite girder under vertical load is approximately 30 times of that of the top flange slab. Considering shear lag effect, the mid-span deflection increases by 13.95% when the composite girder with both ends fixed is subjected to concentrated load, and the slope of the transverse distribution curve of shear lag coefficient is larger than that of simply supported girder. Compared with the traditional box composite girder with corrugated steel webs, the accordion effect of this kind of composite girder is significantly increased. Due to accordion effect, the tensile stress at the intersection of the bottom slab and webs in the mid-span section of the composite box girder with fixed ends increases by 34.67%. Moreover, the stronger the boundary constraint is, the more significant the shear lag and accordion effects of composite box girder are. © 2019, Editorial Department of China Railway Science. All right reserved.
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页码：52 / 59
页数：7
相关论文
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