摘要
为研究不同体系大跨度缆索承重桥梁主梁梁端位移特性,以主跨988 m的斜拉-悬索协作体系桥——G3铜陵长江公铁大桥主桥为背景,构建相同跨径斜拉桥方案及悬索桥方案,采用有限元软件建立模型计算3种方案在运营阶段的梁端位移,并对梁端位移影响因素进行分析。结果表明:斜拉-悬索协作体系桥方案的梁端位移最小;对斜拉桥方案施加与斜拉-悬索协作体系桥主缆对桥塔纵向约束刚度相同刚度的塔顶纵向弹性约束,对悬索桥方案施加与斜拉-悬索协作体系桥斜拉索对主梁纵向约束刚度相同刚度的塔梁纵向弹性连接或在跨中增设中央扣,可大幅减小斜拉桥方案和悬索桥方案的梁端位移,其中纵向荷载(纵向有车风荷载和制动力荷载)引起的梁端位移大幅减小,活载引起的梁端位移也有一定程度的减小。斜拉-悬索协作体系桥方案存在主缆-桥塔-斜拉索-主梁的纵向约束体系,相对单纯的斜拉桥方案与悬索桥方案,对抵抗纵向荷载有较大的优势,因此其梁端位移小于单纯的斜拉桥方案和悬索桥方案。
The study in this paper focuses on the girder-end displacement characteristics of the long-span cable-supported bridges of different systems.The main bridge of Tongling Changjiang River Rail-cum-Road Bridge carrying a section of the G3 Expressway—a hybrid cable-stayed suspension bridge with a main span of 988 m is taken as a prototype bridge.The girder-end displacement behaviors of the conventional cable-stayed bridge and suspension bridge as well as the hybrid cable-stayed suspension bridge were numerically simulated,and the influential factors were analyzed.As per the calculation,the girder-end displacement in the hybrid system is the smallest.When the cable-stayed bridge is fitted with a tower-top longitudinal elastic restraint with a stiffness similar to the longitudinal restraint stiffness of the towers in the hybrid system imposed by main cables,the girder-end displacement will be significantly reduced.And for the suspension bridge,when the towers and the stiffening girder are elastically connected with a stiffness similar to the longitudinal restraint stiffness of the stiffening girder in the hybrid system imposed by stay cables,or when there is a central buckle in the stiffening girder,the girder-end displacement in the suspension bridge will be notably reduced.In both the conventional cable-stayed bridge and suspension bridge,the girder-end displacements induced by longitudinal loads(longitudinal wind loads when there are vehicles on the deck and impact loads)are remarkably suppressed,and the girder-end displacements induced by live loads are also alleviated to a degree.The hybrid cable-stayed suspension bridge has an intrinsic main cables-towers-stay cables-stiffening girder longitudinal restrain system,therefore,it resists longitudinal loads better than the conventional cable-stayed bridge and suspension bridge,and correspondingly produces smaller girder-end displacements.
作者
肖海珠
谢兰博
邱峰
何东升
XIAO Haizhu;XIE Lanbo;QIU Feng;HE Dongsheng(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第S02期72-78,共7页
Bridge Construction
基金
中国国家铁路集团有限公司科技研究开发计划项目(J2022Z504)
中国中铁股份有限公司科技研究开发计划项目(2022-专项-01)
关键词
斜拉-悬索协作体系桥
斜拉桥
悬索桥
梁端位移
塔顶纵向弹性约束
中央扣
塔梁纵向弹性连接
有限元法
hybrid cable-stayed suspension bridge
cable-stayed bridge
suspension bridge
girder-end displacement
tower-top elastic restraint
central buckle
tower-girder elastic connection
finite element method
作者简介
肖海珠,1970—,男,教授级高工,1992年毕业于西南交通大学桥梁工程专业,工学学士,2007年毕业于同济大学桥梁与隧道工程专业,工程硕士。研究方向:铁路、公路桥梁工程设计与管理,E-mail:2724263051@qq.com;谢兰博,1991—,男,高级工程师,2013年毕业于湖南大学土木工程专业,工学学士,2016年毕业于西南交通大学桥梁与隧道工程专业,工学硕士。研究方向:大跨度桥梁设计,E-mail:1007092592@qq.com;邱峰,1981—,男,正高级工程师2003年毕业于华中科技大学土木工程专业,工学学士,2007年毕业于华中科技大学桥梁与隧道工程专业,工学硕士。研究方向:大跨度桥梁设计,E-mail:364144012@qq.com;何东升,1989—,男,高级工程师,2010年毕业于湖南大学土木工程专业,工学学士,2013年毕业于湖南大学桥梁与隧道工程专业,工学硕士。研究方向:大跨桥梁结构设计与理论,E-mail:yzhds@163.com
