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。
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 pouring 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 fulcrum 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.
作者
叶亮
李三亚
YE Liang;LI Sanya(Ningbo Qianwan Holding Group Co.,Ltd.,Ningbo,Zhejiang 315300,China;China Design Group Co.,Ltd.,Nanjing,Jiangsu 210000,China)
出处
《黑龙江交通科技》
2024年第11期75-80,共6页
Communications Science and Technology Heilongjiang
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
continuous steel-concrete composite beam
negative moment zone
bridge panel pouring sequence
center fulcrum jacking
作者简介
叶亮(1979-),男,浙江遂昌人,硕士,高级工程师,研究方向:城市道路、桥梁设计及建设管理。
