大跨空间异形桁架人行桥设计分析

Design and analysis of long-span space special-shaped truss footbridge

为拓展城市景观桥梁设计思路,开展一种空间异形钢管桁架结构的设计研究。从城市景观桥梁的景观效果、结构受力的合理性、使用人群的舒适性等各角度综合考虑,提出了采用变截面弯、坡桁架异形桥的桥型设计方案。桥梁主体结构跨径布置为22.162+15.628+65.729+11.517,桥面宽4m。组成桁架的各构件均采用圆形钢管,构件采用工厂相贯线切割、焊接制造,现场吊装的方法施工。结构分析采用MIDAS Civil软件建立全桥有限元模型,分析了结构内力、变形以及适用性等方面,该桥结构满足城市人行桥梁的运营设计要求。

In order to expand the design ideas of urban landscape bridges,the design research of a special-shaped steel tube truss structure was carried out.Considering the landscape effect of urban landscape bridges,the rationality of structural stress,and the comfort of users,the design scheme of special-shaped bridges with curved and sloping trusses with variable cross-section is put forward.The span arrangement of the main structure of the bridge is 22.162+15.628+65.729+11.517,and the bridge deck is 4m wide.All members of truss are made of round steel pipes,which are manufactured by cross-cutting and welding in factory,and constructed by hoisting on site.The finite element model of the whole bridge is established by MIDAS Civil software,and the internal force,deformation and applicability of the structure are analyzed.The bridge structure meets the operational design requirements of urban pedestrian bridges.