常德市沅江大跨度自锚式悬索桥设计关键技术  

Key Design Technologies of Changde Yuanjiang Long⁃span Self⁃anchored Suspension Bridge

作　　者：莫朝庆 钟海 MO Chaoqing;ZHONG Hai(Hunan University Design and Research Institute Co.Ltd.,Changsha 410002,China)

机构地区：[1]湖南大学设计研究院有限公司,长沙410002

出　　处：《铁道建筑》2022年第9期66-69,共4页Railway Engineering

摘　　要：常德市沅江六桥为双塔自锚式悬索桥,主桥跨径380 m,总长830 m。本文从桥型和跨径的选择到结构设计介绍了桥梁方案,并从大桥抗风、抗震和组合桥面疲劳性能三个方面介绍了大跨度自锚式悬索桥设计中的关键技术问题。采用流体动力学数值分析方法对主梁断面三分力系数、颤振临界风速等性能指标进行计算,大桥抗风性能满足要求。考虑纵向+竖向地震作用和横向+竖向地震作用两种工况,分别按反应谱法和时程分析法进行桥梁抗震分析,主梁、墩塔强度均满足抗震要求。桥面采用钢-超高性能混凝土轻型组合桥面,对桥面板进行疲劳验算,组合桥面各构造细节应力幅均满足规范要求,并且能大幅减少应力幅。The sixth Yuanjiang River Bridge in Changde is a double-tower self-anchored suspension bridge with a main span of 380 m and a total length of 830 m.The bridge scheme from the selection of bridge type and span to structural design was introduced,and the key technical problems in the design of long-span self-anchored suspension bridge from three aspects of bridge wind resistance,seismic and composite deck fatigue performance were expounded in this paper.The aerodynamic numerical analysis method was used to calculate the three component coefficients of the main girder section,flutter critical wind speed and other performance indicators.The wind resistance performance of the bridge meets the requirements.Considering the two working conditions of longitudinal+vertical seismic action and transverse+vertical seismic action,the seismic analysis of the bridge was carried out according to the response spectrum method and time history analysis method respectively.The strength of the main girder and pier tower meet the seismic requirements.The deck was made of steel-ultra high performance concrete light composite deck.The fatigue check calculation was carried out for the deck.The stress amplitude of each structural detail of the composite deck meets the specification requirements.Application of composite deck can greatly reduce the stress amplitude.

关 键 词：城市桥梁 桥梁设计 数值模拟 理论分析 自锚式悬索桥 抗风 抗震 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]