无背索斜拉桥结构设计与施工  

Structural Design and Construction of No-backstay Cable-stayed Bridge

作　　者：吴太广[1] 

机构地区：[1]广东省建筑设计研究院,广东广州510010

出　　处：《城市道桥与防洪》2016年第7期160-162,18,共3页Urban Roads Bridges & Flood Control

摘　　要：无背索斜拉桥是一种新型斜拉桥,其造型独特,且极具视觉冲击,适合于对景观要求较高的城市桥梁。为了全面了解其结构构造、受力特点及动力特性,以某无背索斜拉桥方案设计为例,详细介绍了主塔、主梁、拉索等主要构件结构设计,并通过建立三维有限元模型,分析了其动力特性与稳定性。结果表明,一阶失稳模态为主塔侧弯,其稳定系数偏高,主塔截面仍有优化空间。另外,分析了无背索斜拉桥的斜塔倾角及主梁截面形式选取等关键技术问题。The no-backstay cable-stayed bridge is a new type of cable-stayed bridge. Its modeling is unique with the visual impact. It is suitable for the urban bridges with high landscape requirements. In order to fully understand its structure, mechanical behavior and dynamic characteristics, and taking a scheme design of no-backstay cable-stayed bridge as an example, this paper introduces the design of main components, such as the main pylon, main beam, stay cable and so on in detail. The 3D finite element model is established to analyze its dynamic characteristics and stability. The results show that the first-order instability mode is lateral bending of the main pylon, its stability coefficient is little high, and the section of the main pylon still has space for optimization. In addition, this paper analyzes the key technical issues of selecting the dip angle of pylon and the section of beam of no-backstay cable-stayed bridge, and introduces the construction method of no-backstay cable-stayed bridge.

关 键 词：无背索斜拉桥 斜塔体系 斜塔倾角 桥型研究 景观桥 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]