摘要
为了准确分析单箱双室波纹钢腹板组合箱梁的竖向弯曲力学性能,考虑了组合箱梁的剪力滞、剪切变形、腹板褶皱效应以及剪滞翘曲应力自平衡等因素,设置了3个剪滞纵向翘曲位移差函数,进而基于能量变分法建立了组合箱梁的弹性控制微分方程和自然边界条件。研究表明,褶皱效应对组合箱梁力学性能具有一定影响,且集中荷载下组合箱梁的褶皱效应更为突出;简支边界条件下,组合箱梁剪力滞效应明显,特别是集中荷载组合箱梁的剪力滞效应趋强;本文方法具有一定的理论和工程实用价值,且对该类结构设计具有重要的指导作用。
In order to accurately analyze the vertical bending behavior of Twin-Cell composite box girders,the accordion effect,the Self-stress equilibrium for the shear lag warping stress,the shear deformation and other factors are considered.Three longitudinal displacement difference functions are employed to exactly describe the variation of shear lag in box girders with different widths.Next,based on the variational energy-variation method,the differential equations and the boundary conditions of the composite box girders are derived,and the contribution of accordion effect,shear lag effect and shear deformation to stress of the box girder is analyzed in detail.The results show that the accordion effect has a certain influence on the mechanical properties of a box girder,and the accordion effect of a box girder is more prominent under concentrated load.The shear lag effect of a box girder is obvious under simply supported boundary conditions,especially for a box girder with concentrated load.They have some guiding significance for the design of composite structures.
作者
王根会
陈义勤
樊江
甘亚南
WANG Gen-hui;CHEN Yi-qin;FAN Jiang;GAN Ya-nan(School of Civil Engineering and Architecture,Lanzhou Jiaotong University,Lanzhou 730070,China;Shanghai East China Railway Construction Supervision Co. ,Ltd. ,Shanghai 200070,China;Gansu Province Transportation Planning,Survey & DesignInstitute Co. ,Ltd. ,Lanzhou 730070,China;School of Civil Engineering and Architecture,Yancheng Institute of Technology,Yancheng 224051,China)
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2020年第3期355-361,共7页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(51368035)
甘肃省交通厅项目甘肃省高速公路钢-混凝土组合桥梁推广应用研究(2016-34)
住房和城乡建设部研究项目(2016-K4-082)资助项目。
关键词
单箱双室组合箱梁
褶皱效应
剪力滞
自应力平衡条件
能量变分法
Twin-Cell composite box girders
accordion effect
shear lag
Self-stress equilibrium condition
energy-variation method
作者简介
王根会(1962-),男,博士,教授,E-mail:wghx456@163.com。
