基于剪力-柔性梁格法的分岔式变宽箱梁分析  

Analysis of Space Effect of Widened Box-girder Bridge Based on Beam GridMethod

作　　者：马旭涛 缪星 邱文军 MA Xu-tao;MIAO Xing;QIU Wen-jun(Zhejiang Highway&Water Transportation Engineering Consulting Corporation,Hangzhou 310000)

机构地区：[1]浙江公路水运工程咨询有限责任公司,浙江杭州310000

出　　处：《黑龙江交通科技》2021年第1期101-103,共3页Communications Science and Technology Heilongjiang

摘　　要：结合工程实例,采用空间有限元软件Midas Civil对某分岔式变宽箱梁进行基于剪力-柔性梁格法的空间受力分析,并与单梁模型的计算结果进行了对比验证。分析表明:梁格模型中各纵梁受力与支座的横向布置位置密切相关;常规的单梁模型不能考虑由于恒载横向不均匀分布而产生的空间效应,对于某些宽箱梁,常用的偏载增大系数取值偏小;梁格模型可以较为真实的模拟荷载横向不均产生的空间效应,更好的指导结构设计。The finite element software Midas civil was used to compare and analyze the calculation results of single beam model and shear-flexible grillage method for a bifurcated box-girder.The results shows that the stress of longitudinal webs in the beam grid model are related to the transverselocation of the support.The single beam model often neglects the space effect due to the dead load,and the eccentric coefficient of live load is also too small,which is not reliable in some cases.In this paper,the eccentric coefficient of the dead load and live load was given by calculation.In the end a method to solve the problem of the overstressed side webs is provided.

关 键 词：剪力-柔性梁格法 分叉式变宽箱梁 空间效应 Midas Civil 

分 类 号：U442[建筑科学—桥梁与隧道工程]