大跨连续梁拱组合桥梁施工关键阶段变形控制分析  

Deformation Control Analysis of Long-span Continuous Beam-arch Composite Bridge during Key Stages of Construction

作　　者：李强 LI Qiang(Hebei Expressway Development(Group)Co.,Ltd.,Shijiazhuang 050000)

机构地区：[1]河北高速公路开发(集团)有限公司,石家庄050000

出　　处：《公路交通技术》2024年第5期142-149,共8页Technology of Highway and Transport

摘　　要：大跨连续梁拱组合桥梁在各施工阶段,主梁和拱肋等关键部位的变形受多种组合因素影响,为探究尼尔森体系梁拱组合斜交桥梁施工过程中主梁及拱肋的变形规律,开展了施工关键阶段变形控制分析,并以一座大跨尼尔森体系连续梁拱组合斜交桥梁为例,采用数值模拟的方法分析结构施工过程对桥梁各个施工阶段下的关键截面变形规律。计算结果表明:1)各个施工阶段下,主梁的斜交效应显著,主梁弯扭耦合变形明显,桥梁左右侧腹板的竖向位移存在显著差异,且该位移关于跨中截面呈反对称分布;2)因拱肋与吊杆的不对称布置,致使左右拱肋挠度关于拱顶截面基本呈反对称分布。该研究结果可供类似大跨连续梁拱组合桥梁的设计与施工参考。During the construction stages of long-span continuous beam-arch composite bridges,the deformation of key components such as the main beam and arch ribs is influenced by various combined factors.To investigate the deformation behavior of the main beam and arch ribs during construction of a Nielsen system skewed continuous beam-arch composite bridge,an analysis of deformation control during key construction stages was conducted.Taking a long-span Nielsen system skewed continuous beam-arch composite bridge as an example,numerical simulations were performed to analyze the deformation patterns of critical sections at each construction stage.The results show that:1) At each construction stage,the skew effect of the main beam is significant,and the main beam exhibits notable coupled bending-torsion deformation,leading to a substantial difference in the vertical displacement of the left and right webs.The vertical displacements of the webs are anti-symmetrically distributed about the midspan section;2) Additionally,due to the asymmetric arrangement of the arch ribs and hangers,the deflection of the left and right arch ribs is generally anti-symmetrically distributed about the arch crown section.This study can provide guidance and reference for the design and construction of similar long-span continuous beam-arch composite bridges.

关 键 词：尼尔森体系 梁拱组合桥梁 斜交桥梁 数值模拟 变形分析 

分 类 号：U445[建筑科学—桥梁与隧道工程]