PBL加劲型矩形钢管混凝土组合桁梁桥设计  

Design of PBL-Stiffened Steel Truss-Concrete Composite Girder Bridge with Truss Made of Rectangular Steel Tubes

作　　者：刘彬 刘永健[1] 杨岳华 曹明明 王康宁 LIU Bin;LIU Yong-jian;YANG Yue-hua;CAO Ming-ming;WANG Kang-ning(School of Highway, Chang′an University, Xi′an 710064, China;Construction Headquaters of Hangzhou Section of Zhejiang Transportation Group, Hangzhou 310012, China;China Railway Bridge Science Research Institute, Ltd., Wuhan 430034, China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]浙江省交通集团杭州板块建设指挥部,浙江杭州310012 [3]中铁大桥科学研究院有限公司,湖北武汉430034

出　　处：《桥梁建设》2019年第5期97-102,共6页Bridge Construction

基　　金：国家自然科学基金项目（51778058,51378068）;中央高校基本科研业务费专项资金资助项目（300102219310）~~

摘　　要：高速公路跨线桥黄延桥为(24+40+24) m连续刚构体系PBL 加劲型矩形钢管混凝土组合桁梁桥。该桥主梁采用矩形钢管桁架和混凝土行车道板构成的组合桁梁;桥墩采用Y形双肢矩形钢管混凝土树状桥墩,下设菱形承台+钻孔灌注桩基础。在负弯矩区下弦杆和Y形桥墩的矩形钢管内设置PBL纵肋并灌注混凝土,形成PBL加劲型矩形钢管混凝土断面,以提高杆件承载力、改善受压钢管局部屈曲性能。为提高该桥PBL加劲型矩形钢管混凝土节点的承载力、改善节点的失效模式,采取主管内灌注混凝土和支管与主管同宽两项优化措施。混凝土桥面板通过上弦闭口PBL开孔预埋钢板连接件与主桁相连。桥墩通过纵、横向呈方格网络集中布置的PBL开孔钢板与承台固结。The Huangyan Bridge is a highway overpass with three spans of 24, 40 and 24 m. Structurally, it is a continuous rigid-frame system with main girder formed of steel trusses and concrete slabs. The steel trusses are made from rectangular steel tubes partially stiffened by PBL connectors. The piers are Y-shaped piers formed of rectangular concrete-filled steel tubes, like a tree, underneath which are the rhombic pile caps and bored pile foundations. PBL longitudinal ribs are added to the lower chord of the truss in the hogging moment region and the rectangular steel tubes of the piers, and these tubes are also filled with concrete to form a PBL stiffened rectangular reinforced concrete cross section, thus to improve the load bearing capacity of the components and enhance the local buckling performance of the steel tubes bearing compressive force. To improve the load bearing capacity of the panel points of the PBL stiffened concrete-filled steel tubes and better change the failure mode of the panel points, the main tubes are filled with concrete, and the width of the branch tubes and the main tubes are kept the same. The concrete slabs are connected with the main truss via the closed PBL connectors in the upper chord, and the pier is fixed with the pile cap with the PBL connectors concentrated in the longitudinal and transverse direction in check pattern.

关 键 词：组合桁梁桥 跨线桥 矩形钢管混凝土结构 PBL加劲肋 负弯矩区优化 节点优化 PBL混合连接技术 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]