大跨独塔钢箱梁斜拉桥合理纵向约束体系研究  

Research on Reasonable Longitudinal Constraint System for Large Span Single Tower Steel Box Beam Cable-stayed Bridges

作　　者：张坤 ZHANG Kun(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《交通科技》2024年第5期95-99,116,共6页Transportation Science & Technology

摘　　要：大跨独塔双跨钢箱梁斜拉桥结构相对较柔,宜寻求一种合理约束体系方案,以提升结构竖向刚度并兼顾其抗震性能。文中依托某240+240 m独塔钢箱梁斜拉桥,开展纵向传力机理研究,对独塔双跨和辅助墩2种结构体系在不同纵向约束条件进行静、动力和抗震性能参数分析,并对独塔双跨体系5种纵向约束方式进行比选。结果表明,采用较强的纵向约束可以较好改善主梁纵向位移过大和竖向刚度不足的问题。提出了一种限位剪断+阻尼器的纵向约束方式,并总结剪断力合理取值方法,经验证,该约束较好地兼顾了静力工况和地震工况在不同受力状态下的边界需求,是一种较理想的纵向约束体系。The structure of long-span single-tower double-span steel box girder cable-stayed bridge is relatively flexible,so a reasonable constraint system scheme should be sought to improve the vertical stiffness of the structure and give consideration to its seismic performance.Based on a single-tower cable-stayed bridge with a span of 240 m+240 m,the longitudinal force transmission mechanism was studied,and the static,dynamic and seismic performance parameters of the two-span single-tower and the auxiliary piers were analyzed under different longitudinal constraints.In addition,five longitudinal constraints of the two-span single-tower structural system were compared and selected.The results show that the problems of excessive longitudinal displacement and insufficient vertical stiffness of the main beam can be improved by using stronger longitudinal constraints.A longitudinal constraint system with limit shear and damper is proposed,and a reasonable value method of shear force is given.According to verification,the constraint takes into account the boundary requirements of static and seismic conditions under different stress states,which is an ideal longitudinal constraint system.

关 键 词：独塔斜拉桥 钢箱梁 约束体系 竖向刚度 抗震分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.54[交通运输工程—道路与铁道工程]