钢混组合连续箱梁桥负弯矩区设计研究  

Research on Design of Hogging Moment Area of Steel-concrete Composite Continuous Box Girder Bridge

作　　者：马国纲 刘彬 童景盛 蒲北辰 庞伟 MA Guogang;LIU Bin;TONG Jingsheng;PU Beichen;PANG Wei

机构地区：[1]中国市政工程西北设计研究院有限公司,甘肃兰州730030

出　　处：《城市道桥与防洪》2023年第9期30-35,41,M0005,M0006,共9页Urban Roads Bridges & Flood Control

摘　　要：为有效改善连续钢混组合箱梁桥负弯矩区受力性能,以临汾市滨河西路与彩虹桥、景观大道立交桥项目为工程案例,提出基于顶升工艺的连续钢混组合箱梁桥负弯矩区设计方法。对桥面板施工工序、支点顶升顺序、桥面板存放龄期等顶升设计参数展开研究,以期桥面板和钢梁达到良好的受力状态,并对结构线型进行了施工全过程监控。研究表明:皮尔格法可有效降低中支点桥面板拉应力,降低幅值达60%;支点顶升顺序会显著影响桥面板预压应力效果,各支点桥面板预压应力均匀是评价顶升顺序的重要技术指标;随着桥面板存放龄期的增长,其裂缝宽度明显减小。临汾市滨河西路与彩虹桥、景观大道立交桥项目的建成是基于顶升工艺的连续钢混组合箱梁桥在市政桥梁工程领域的一次成功尝试,其负弯矩区设计思路、设计参数取值可对国内钢混组合桥梁的大规模建造提供很好的借鉴意义。In order to effectively improve the mechanical behavior of hogging moment area of continuous steel-concrete composite box girder bridge,taking the interchange project of West Binhe Road,Caihong Bridge and Landscape Avenue in Linfen City as an engineering case,the design method of hogging moment area of continuous steel-concrete composite box girder bridge based on jacking technology is proposed.The jacking design parameters including the construction order of bridge deck,jacking order of middle fulcrum and storage age of bridge deck are studied in order to make the bridge deck and steel girder reach the good mechanical behavior.And the whole construction process of structure alignment is monitored.The research shows that the Pilger process can effectively reduce the tensile stress of bridge deck at the middle fulcrum and the reducing amplitude is 60%.The order of jacking at the fulcrum will obviously influence the compressive pre-stress effect of bridge deck.The uniform compressive pre-stress of each fulcrum bridge deck is an important technical indicator to evaluate the order of jacking.The crack width reduces obviously with the increase of storage age of bridge deck.The completion of the interchange project of West Binhe Road,Caihong Bridge and Landscape Avenue in Linfen City is a successful attempt of continuous steel-concrete composite box girder bridge based on jacking technology in the municipal bridge engineering field.The design ideas and design parameter values of its hogging moment area will provide the good reference for the large-scale construction of steel-concrete composite bridges in China.

关 键 词：顶升工艺 连续钢混组合箱梁 负弯矩区设计 顶升设计参数 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]