计算力学学报2024，Vol.41Issue(6)：1053-1059,7.DOI:10.7511/jslx20230516001
基于比拟杆法的变截面连续箱梁剪力滞效应分析
Theoretical analysis for shear-lag effect of variable box section continuous girder based on bar simulation method
摘要
Abstract
Aiming at the problem that the existing methods for shear lag effect analysis are difficult to apply to a variable cross-section continuous box girder,this paper proposes a methods for shear lag effect analysis for variable cross-section continuous concrete box girder based on the bar analogy method.Firstly,the governing differential equation of shear lag of variable cross-section continuous box girder is established by using the bar analogy method.Secondly,the correctness and applicability of the proposed method are verified by finite element analysis results and experimental results,and the influence of different element types on shear lag is analyzed.Finally,the shear lag effect in the cantilever construction process of three-span concrete continuous box girder is analyzed.The results show that the shear lag effect of the flange plate on the three-span variable cross-section continuous beam is the most obvious at the support,followed by the shear lag effect at the middle of the middle span,and the shear lag effect between the middle support and the middle span is negligible.During the whole cantilever construction process of a three-span continuous beam,the shear lag effect of the upper and lower flange plates of the block 0 radually decreases.After the bridge is completed,the shear lag effect of the upper and lower flange plates of the block 0 increases.During the whole cantilever construction process of the three-span continuous beam,the positive shear lag effect of the upper and lower flange plates of block 1 gradually decreases.The shear lag effect of the upper and lower flange plates of block 1 is reduced.The conclusions can provide reference for the analysis and calculation of shear lag effect of variable cross-section continuous beams.关键词
桥梁工程/剪力滞效应/比拟杆法/变截面连续箱梁/悬臂施工Key words
bridge engineering/shear lag effect/bar simulation method/variable cross-section continuous box girder/cantilever construction分类
交通工程引用本文复制引用
冀伟,石旭辉,罗子钧,罗奎,黄逸航..基于比拟杆法的变截面连续箱梁剪力滞效应分析[J].计算力学学报,2024,41(6):1053-1059,7.基金项目
国家自然科学基金(52168019) （52168019）
甘肃省重点研发计划-工业类项目(23YFGA0043)资助. （23YFGA0043）
