丰城紫云大桥组合钢板梁设计  

Design of Composite Steel Plate Beam for Ziyun Bridge in Fengcheng

作　　者：林友强 LIN Youqiang

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2024年第7期90-94,M0010,共6页Urban Roads Bridges & Flood Control

摘　　要：丰城市紫云大桥陆上引桥采用连续组合钢板梁,南岸标准段跨径布置为(34.5+2×36+3×42+2×36+34.5)m。主梁采用双主梁组合钢板梁结构,小横梁体系,梁高2.1 m。钢梁由焊接工字钢纵梁、中间小横梁以及支点横梁等组成,中支点两侧各约0.125 L范围内的钢纵梁纵向板件采用Q420qD钢,其余钢材采用Q345qD钢。桥面板采用全宽预制的预应力混凝土桥面板,湿接缝混凝土采用超高性能混凝土(UHPC),预制桥面板纵向钢筋外伸长度大于10 d,无需现场焊接或绑扎。板梁连接采用新型灌浆剪力键,钢梁与桥面板通过焊钉连接件、槽口、高强砂浆填充料、注浆孔、通气孔以及橡胶条,形成一个完全连接的整体。钢梁采用临时支架分段吊装施工,预制桥面板采用先吊装结合正弯矩区桥面板后负弯矩区桥面板的顺序铺设。对结构进行强度、稳定和变形分析,结果均满足设计要求。The onshore approach bridge of Ziyun Bridge in Fengcheng is a continuous composite steel plate beams.Its span layout in the standard section on the south bank is(34.5+2×36+3×42+2×36+34.5)m.The main beam is a double-girder composite steel plate beam structure,which is a small crossbeam system,and a beam height is 2.1 m.The steel beams consist of the welded I-shaped steel longitudinal beam,intermediate small crossbeams and support crossbeam.The longitudinal plate sections of the steel beams within approximately 0.125 L on each side of the intermediate support are made of Q420qD steel,while the rest of the steel materials are Q345qD steel.The bridge deck slabs are the prefabricated full-width prestressed concrete deck slabs,and the concrete of wet joints is the ultra-high-performance concrete(UHPC).The longitudinal steel reinforcement of the prefabricated bridge deck slab extends more than 10 d,eliminating the need for on-site welding or binding.The slab and beam connection uses a new type of grout shear key.The steel beams are connected to the bridge deck slabs through welding studs,grooves,high-strength mortar filler,grouting holes,ventilation holes and rubber strips,forming a completely integrated connection.The steel beams are hoisted in sections by temporary supports.The prefabricated bridge deck slabs are installed in the sequence of first hoisting and combining the positive bending moment region slabs followed by negative bending moment region slabs.The strength,stability,and deformation analyses have been conducted on the structure.The results meet the design requirements.

关 键 词：组合钢板梁 双主梁 小横梁 UHPC 预制桥面板 灌浆剪力键 结构设计 吊装施工 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]