跨巢湖大桥分离式双箱PK断面结合梁设计  

Design of Composite Girder Having PK Bridge Section of Separated Twin Boxes for Huguang Road Bridge Crossing Chaohu Lake

作　　者：常付平[1] 卢永成[1] 李文勃[1] 沈祺[1] 

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《桥梁建设》2015年第1期91-96,共6页Bridge Construction

摘　　要：安徽省巢湖市湖光路跨巢湖大桥主桥为独塔双索面混合梁斜拉桥,边跨设2个辅助墩,跨径布置为(40+45+117.5)m+300m。主跨及边跨近塔108.5m范围主梁采用结合梁,梁高3m,全宽37m。结合梁由混凝土桥面板和钢箱梁组成,钢箱梁采用分离式双箱PK断面,单个钢箱梁纵梁顶宽(含风嘴)10.21m,底宽4m。两纵梁之间采用横梁连接,横梁采用工字形断面,间距4.5m。横隔板采用实腹式和空腹式2种,为充分发挥材料性能,横隔板间距取2.25m。两纵梁之间设3道小纵梁,小纵梁采用工字形断面,为使桥面板达到双向板的受力性能,小纵梁高度取0.8m。结合段主纵梁采用后承压板格构式方案、小纵梁采用前承压板式方案以保证主梁内力的平顺传递和刚度的平缓过渡。结合梁段斜拉索采用锚拉板锚固。The main bridge of the Huguang Road Bridge Crossing Chaohu Lake in Chaohu City, Anhui Province is a hybrid girder cable-stayed bridge with a single pylon, double cable planes and with span arrangement （40＋45＋117.5） m＋300 m. At the side span of the bridge, 2 auxiliary piers are arranged and in a range of 108.5 m of the main and side spans nearby the py- lon, the main girder is designed as the composite girder that is 3 m in depth and 37 m in full width. The composite girder is made up of the concrete deck slabs and steel box girders and the steel box girders are of the Pasco-Kennewick （PK） Bridge section of separated twin boxes. The width of the top plate of a single longitudinal steel box girder （the wind fairing is included） is 10.21 m and the bottom plate is 4 m. The two longitudinal steel box girders are connected by the cross beams that have I-shape sections and spacing distance of 4.5 m. 2 types of the solid and hol- low diaphragms are employed. To bring the material performance into full play, the spacing dis- tance of the diaphragms is 2.25 m. In between the two longitudinal steel box girders, 3 strings that have I-shape sections are arranged. To ensure that the deck slabs to have the dual load bear- ing capacity, the depth of each stringer is 0.8 m. The longitudinal main girder at the joint section of the bridge is provided with the rear bearing plate cellar structures and the stringers are provid- ed with the front bearing plate structures so as to ensure smooth transition of the internal forces and gentle transition of the stiffness of the main girder. The anchorage for the stay cables at thecomposite girder are the anchor tensile plate structures.

关 键 词：斜拉桥 混合梁 结合梁 分离式双箱PK断面 构造设计 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U448.216[交通运输工程—道路与铁道工程]