河北水利电力学院学报2023，Vol.33Issue(4)：48-52,5.DOI:10.16046/j.cnki.issn2096-5680.2023.04.009
移动荷载作用下变截面连续箱梁桥的约束扭转效应研究
Research on Restrained Torsion Effect of Continuous Box Girder Bridge with Variable Cross-section under Moving Load
摘要
Abstract
In order to study the characteristics of stress distribution and deformation of box girder bridge with variable cross section,the element stiffness matrix of box girder with variable cross section is derived based on the restrained torsion differential equation of box girder.Based on the analysis of the pro-ject,three load distribution conditions are set up,and the bending moment and warping displacement of box girder with variable cross-section are calculated,the stress amplification effect is also studied.The re-sults show that the curves of moment changing with longitudinal distance in case 1 and case2 are similar and show"W"shape.In condition 3,the trend of change was just opposite,myopia presented"M"type,and both the value and the range of change were small.The warping displacements are mainly concentrated at the end and the middle of the side span,and show an anti-symmetric distribution with the mid-span sec-tion as the boundary.In case 1 and case 2,the values of the generalized warpage displacement in mid-span and right-span are basically the same.The curve of warping double moment shows the law of attenuation from the peak point to the two sides,and the extreme value appears at the position of the center fulcrum and the action point of the concentrated load.The maximum normal stress of warpage occurs in the section under the action of concentrated load.The stress magnification coefficients of the four control sections are less than 1.41 under three loading conditions.关键词
变截面/连续箱梁/约束扭转/应力放大系数Key words
variable cross section/continuous box girder/constraint Twist/stress amplification factor分类
交通工程引用本文复制引用
王伟..移动荷载作用下变截面连续箱梁桥的约束扭转效应研究[J].河北水利电力学院学报,2023,33(4):48-52,5.基金项目
中国铁建股份有限公司科技研发计划项目(18-C03) （18-C03）
