(1 中衡设计集团股份有限公司， 苏州 215021； 2 苏州市吴江滨湖投资集团股份有限公司， 苏州 215000；3 同济大学土木工程学院， 上海 200092； 4 施莱希工程设计咨询（上海）有限公司， 上海 200031)

［摘要］某钢结构慢行桥由于桥体造型及功能的要求，采用异型吊索拱结构。钢桥桥面梁顺桥向为（24+54+28）m三跨钢箱梁，横桥向宽度在8-250～14-721m范围随桥型变化，设置3根方钢管拱及32根吊索以实现结构整体受力合理。设计时对桥拱及钢梁结构选型、设计参数选取等进行了分析研究，并通过找力分析确定吊索初拉力，采用SAP2000软件分别建立梁单元模型及多尺度模型对结构体系在各荷载组合工况下进行了静力分析及动力分析，得到了结构的受力和变形特点。在此基础上，对桥梁基础形式进行多方案对比设计，以保证桥梁整体设计的可靠度与安全性。最后探讨了异型钢结构桥梁设计中需注意的问题。

［关键词］异型吊索拱结构钢桥； 多尺度模型； 找力分析； 基础设计

中图分类号：TU318文献标识码：A文章编号：1002-848X(2016)20-0094-05

Design and analysis of a large-span special-shaped suspension steel bridge with arch structure

He Chen1, Lin Jing2,3, Chen Wei4, Yang Lülei1, Wang Guanghui1, Shen Xiaoming1

（1 ARTS Group Co., Ltd., Suzhou 215021, China； 2 Builtop Group Co., Ltd., Suzhou 215000, China； 3 Department of Civil Engineering, Tongji University,  Shanghai 200092, China; 4 Schlaich Bergermann und Partner, Shanghai 200031, China）

Abstract:Due to the architecture modeling and functional requirements of the bridge, the steel structure non-vehicle bridge uses special-shaped suspension arch structure. A three-span steel box beam with spans of 24m, 54m and 28m respectively is arranged in direction along steel bridge and the width across the bridge ranges from 8-250m to 14-721m according to the bridge shape. In order to realize reasonable mechanical structure as a whole, the bridge sets three square steel tube arches and 32 suspension cables. The structural system selection and design parameters of bridge arch and steel beam were studied and analyzed. Force-finding analysis was used to determine initial tension force of cables. Beam element model and multi-scale model were established by SAP2000 software to conduct static analysis and dynamic analysis on the structural system under different load combinations, to obtain the mechanical and deformation characteristics of the structure. Based on this, multiple schemes were compared and designed on bridge foundation forms to guarantee the reliability and safety of the overall bridge design. At last, the problems that should be paid attention to in the design of special-shaped steel structure bridge were discussed.

Keywords:special-shaped suspension steel bridge with arch structure; multi-scale model; force-finding analysis; foundation design

作者简介：何晨，硕士，工程师，Email：hechen@artsgroup.com。