河北工业科技2025，Vol.42Issue(3)：258-264,7.DOI:10.7535/hbgykj.2025yx03007
宽幅双索面双箱组合梁斜拉桥剪力滞效应研究
Study on shear lag effect of wide-span double-cable-plane double-box composite girder cable-stayed bridge
摘要
Abstract
In order to study the characteristics of the non-uniform distribution of the longitudinal normal stress caused by the shear lag effect of the wide-span double-cable-plane double-box composite girder cable-stayed bridge under typical load conditions,the finite element method was used to analyze the distribution state of the longitudinal normal stress of the main girder.Firstly,the full-bridge beam element model was first established with the help of Midas Civil.On this basis,the local plate-shell finite element models of the mid-span section of the main girder and the pylon section were constructed using Abaqus.Secondly,the dead load,vehicle load and beam end force were applied to the above models,and five typical load conditions were set for calculation,and the distribution diagram of the shear lag coefficient of the main girder section was obtained.Finally,the influences of the spacing of the cross beams,the spacing of the stay cables and the thickness of the top plate of the steel main girder on the shear lag coefficient were deeply discussed.The results show that the shear lag coefficient of the main girder section at the pylon is usually higher than that at the mid span.Under the uniformly distributed load arranged on the bridge deck,the main girder section shows a negative shear lag effect at the positions of the box girders and small longitudinal girders,while when the end of the main girder is under the action of axial pressure or positive bending moment,the box girders and small longitudinal girders show a positive shear lag effect.When the spacing of the cross beams increases from 3 m to 6 m,the shear lag effect of the main girder is enhanced,and the maximum shear lag coefficient increases by 11.72％.When the spacing of the stay cables changes from 8 m to 12 m,the influence on the shear lag effect is limited.When the thickness of the top plate of the steel main girder increases from 10 mm to 34 mm,the maximum shear lag coefficient only increases by 1.77％.This study has ascertained the distribution and variation law of the shear lag coefficient of the wide-span double-box composite girder under typical load conditions,providing reference for the safety design of this type of girder section.关键词
桥涵工程/剪力滞效应/双箱组合梁/双索面斜拉桥/有限元模型/参数分析Key words
bridge and culvert engineering/shear lag effect/double-box composite girder/double-cable-plane cable-stayed bridge/finite element model/parameter analysis分类
交通运输引用本文复制引用
曹思敏,李宏强,赵骏铭,贾庆霖,卫星..宽幅双索面双箱组合梁斜拉桥剪力滞效应研究[J].河北工业科技,2025,42(3):258-264,7.基金项目
广西重点研发计划项目(桂科AB23026124) （桂科AB23026124）
