宽幅大跨脊骨梁矮塔斜拉桥总体设计  

The Overall Design of Wide and Large-span Extradosed Cable-stayed Bridge with Spine Beam

作　　者：孙浩 夏雪莲 SUN Hao;XIA Xuelian(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,Hubei,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《工程技术研究》2025年第2期195-197,共3页Engineering and Technological Research

摘　　要：马口汉江特大桥为双塔中央双索面预应力混凝土矮塔斜拉桥,全长570 m,主跨达260 m,跨径排全国同类型桥梁第三位。主梁采用单箱三室大悬臂脊骨梁,倒Y形混凝土桥塔。文章介绍了该桥的桥型方案、结构设计及静力分析,并针对大悬臂脊骨梁主梁横向受力特点,提出了加强悬臂板构造、优化横向预应力体系等措施,使主梁横向受力性能有了显著改善。分析结果表明,该桥各项性能指标均满足规范要求,且优化后的宽幅脊骨梁主梁横向受力合理,有效预防了悬臂板开裂现象的发生,为其他类似桥梁设计提供了有益参考。Makou Hanjiang Grand Bridge is a double-tower central double-plane prestressed concrete extradosed cable-stayed bridge with a total length of 570 m and a main span of 260 m,which is ranked the third in the same type of bridge in China.The main beam adopts a single-box three-chamber large cantilever spine beam and an inverted Y-shaped concrete bridge tower.This paper introduces the bridge type scheme,structural design and static analysis of the bridge,and proposes measures such as strengthening the cantilever plate structure and optimizing the transverse prestress system according to the transverse force characteristics of the main beam of the large cantilever spine beam,so that the transverse force performance of the main beam has been significantly improved.The analysis results show that all the performance indexes of the bridge meet the requirements of the specification,and the transverse force of the main beam of the optimized wide spine beam is reasonable,which effectively prevents the occurrence of cantilever plate cracking phenomenon and provides a useful reference for the design of other similar bridges.

关 键 词：矮塔斜拉桥 宽幅主梁 脊骨梁 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]