位于圆曲线上的人行钢拱桥设计  

Design of Steel Arch Footbridge on Circular Curve

作　　者：褚文涛[1] 夏刚[1] 杨帆[1] 

机构地区：[1]中铁大桥局集团有限公司,湖北武汉430050

出　　处：《世界桥梁》2015年第2期16-20,共5页World Bridges

摘　　要：为满足金象湖公园1号人行桥跨越公园水域、景观要求,以及保障行人和消防车辆通行,采用"空间曲线桥型、网状异形支撑"设计思路进行桥梁设计。该桥设计为全长79.48m的上承式钢结构刚架拱桥,拱肋及主梁均采用异形钢箱梁,拱梁结合段处拱肋与主梁结合为一整体,基础采用斜PHC管桩基础。通过将拱桥平面投影设置于圆曲线上,达到"空间曲线桥型"的桥梁造型要求;在拱座顶部设置树杈形装饰构件既实现了"网状异形支撑"的生态景观效果,也使得主体结构受力模式更明确、合理;通过优化拱桥平曲线半径,使结构静、动力性能与景观需求达到平衡;采用斜向PHC管桩群桩基础,增强了基础抗推刚度、节省了工程投资。结构分析结果表明,桥梁结构应力、变形及自振竖向频率结果均满足规范要求。To address the requirements of water conservancy and landscape effect and ensure the safety of the passing pedestrians and fire engines,the No.1Footbridge in the Golden Elephant Lake Park is designed following the concept of＂a spatial curved bridge with irregular network supports＂.The bridge is a deck-type rigid-frame steel arch bridge with a total length of 79.48 m.The arch ribs and main girder adopt the irregular steel box cross section,at the arch-rib joint section,the arch ribs and the girder are connected to be an integrated structure.The foundation of the footbridge adopts the oblique PHC pipe piles.By projecting the plan of the arch bridge on a circular curve,the shaping requirements of spatial curved bridge was realized.Branch-shaped decorative components were placed on the top of the arch seats to realize the ecological landscape effect of＂irregular network supports＂,which also enables the load bearing mode of main structure be more clear and rational.The static and dynamic performance of the structure is adjusted to be in balance with the landscape demands by optimizing the plan curvature radius of the arch bridge.The adaptation of oblique PHC group pipe pile foundation strengthened the anti-thrust rigidity of the foundation and saved the project investment.The results of the structural analysis indicate that the structural stress,deformation and vertical natural vibration frequency of the bridge meet the code requirements.

关 键 词：拱桥 景观桥 人行桥 钢箱梁 斜PHC管桩 空间曲线 树杈形装饰构件 桥梁设计 

分 类 号：U448.22[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]