梁格分析方法在变宽箱梁设计中的应用  

Application of grid analysis method in the design of variable width box girder

作　　者：李天龙 LI Tianlong(China Highway Engineering Consulting Corporation,Beijing 100089,China)

机构地区：[1]中国公路工程咨询集团有限公司,北京100089

出　　处：《工程建设》2021年第10期32-37,共6页Engineering Construction

摘　　要：在城市桥梁设计中,经常会遇到宽度较大的变宽现浇箱梁。由于异形特性及汽车荷载的偏载因素,在桥跨方向及横桥向结构受力不具有规律性及对称性,因此采用普通的单梁模型不能准确地分析其受力特性。本文基于实际工程设计案例,采用梁格分析理论,借助有限元计算软件对变宽箱梁结构进行计算分析,并建立单梁、梁格两个模型,对内力及应力结果进行平行对比分析。计算分析结果表明:跨中宽箱梁横断面两边的挠度要大于中部的挠度,挠度与法向压应力呈反相关。In the design of urban bridges,cast-in-place box girder with variable large width is often encountered.Due to the special-shaped characteristics and the eccentric load factors of the automobile load,the structural forces in the span and transverse directions are not regular and symmetrical.Therefore,the ordinary single beam model cannot accurately analyze the force characteristics.In this paper,grid analysis theory is used in practical engineering design cases,the variable width box girder structure is calculated and analyzed using the finite element calculation software.Models of single beam and beam grid were established using finite element software,and the internal force and stress results are compared and analyzed in parallel.The final calculation and analysis results show that the deflection on both sides of the cross section of the mid-span wide box girder is greater than the deflection in the middle,and the deflection is inversely related to the normal compressive stress.

关 键 词：梁格法 变宽箱梁 有限元分析 

分 类 号：U442.52[建筑科学—桥梁与隧道工程]