连续钢-混组合箱梁负弯矩区受力特性分析
Mechanical Characteristic Analysis of Negative Moment Zone of Continuous Steel-concrete Box Girder
叶亮 1李三亚2
作者信息
- 1. 宁波前湾控股集团有限公司,浙江 宁波 315300
- 2. 华设设计集团股份有限公司,江苏 南京 210000
- 折叠
摘要
钢-混组合箱梁具有施工速度快、跨越能力强、工程造价节省等优点,近年来越来越多地被应用在桥梁工程建设中.以兴慈大道快速路跨四灶浦江连续钢-混组合梁桥为工程背景,介绍了多种钢-混组合梁负弯矩区处理方法;运用有限元软件建立空间网格模型,分析了桥面板浇筑顺序及顶升高度对组合梁桥负弯矩区桥面板和钢梁受力情况的影响,为后续同类型桥梁负弯矩混凝土桥面板开裂控制提供了理论依据.计算结果表明:与顺序浇筑相比,桥面板采用先跨中后支点浇筑方式能够显著降低桥面板混凝土的拉应力;采用中支点顶升与调整混凝土浇筑顺序组合施工能够为桥面板运营阶段预留较多的预压应力,预防开裂,且随着支点顶升高度的增加,预压应力也随之增加.
Abstract
Steel-concrete box girder has the advantages of fast construction speed,strong crossing ability,saving project cost,etc.In recent years,it is more and more used in bridge construction.Taking Xingci Avenue Expressway across Sizaopu River continuous steel-concrete mixed composite beam bridge as the engineering background,a variety of negative moment treatment methods for steel-concrete composite beam are introduced.Finite element software is used to establish a space grid model,and the influence of the pou-ring sequence and the lifting height on the stress of the bridge panels and steel beams in the negative moment zone of the composite beam bridge is analyzed,which provides a theoretical basis for the cracking control of the negative moment concrete bridge panels of the same type of bridges.The analysis results show that the tensile stress of bridge slab concrete can be significantly reduced by using the method of first span and then fulcrum placement compared with the sequential placement.The combination construction of middle ful-crum jacking and adjusting concrete placement sequence can reserve more pre-compression stress for the operation stage of bridge panels to prevent cracking,and the pre-compression stress increases with the increase of fulcrum jacking height.
关键词
连续钢-混组合箱梁/负弯矩区/桥面板浇筑顺序/中支点顶升Key words
continuous steel-concrete composite beam/negative moment zone/bridge panel pouring sequence/center fulcrum jacking引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据