悬带式城市人行天桥中的受力性能分析及减振方案设计  

Structural Behavior and Vibration Reduction Design of Stress-Ribbon Footbridge

作　　者：何帆 蒋坤 李瑞然 HE Fan;JIANG Kun;LI Ruiran(Zhuhai Institute of Urban Planning&Design,Zhuhai 519000,China;Hunan Xinshengda Traffic Planning and Design limited company,Changsha 410017,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]珠海市规划设计研究院,珠海519000 [2]湖南新盛达交通规划设计有限公司,长沙410017 [3]河海大学土木与交通学院,南京210098

出　　处：《结构工程师》2023年第2期46-55,共10页Structural Engineers

摘　　要：悬带桥是以受力性能好的缆索或钢拱肋为主要受力体系,结合轻薄梁体的一种新型桥梁结构。目前悬带桥尚未被广泛推广应用,设计及施工等均无法找到足够多的案例作为参考,故深入研究悬带桥的应用具有重要的意义。以珠海市梅华路的悬带桥人行天桥为工程背景,采用Midas Civil建立悬带桥有限元模型,依据国内外现行规范,对结构整体稳定性、强度、挠度、局部构件和自振频率等方面进行验算,并提出一种安装调谐质量阻尼器(TMD)的减振方案,可为悬带桥的推广与应用提供参考。结果表明:在全桥受力分析中,该桥的整体稳定性、强度、挠度、局部构件的验算均可满足国内现行的规范要求;当在桥梁跨中设置TMD进行减振后,桥梁竖向大振动加速度减少了87.6%,桥梁横向大振动加速度减少了87.9%,可以满足人致振动CL1级舒适性要求。The structural system of stress-ribbon bridges is typically comprised of cables or steel arches and thin and light beams.At present,stress-ribbon bridges are still not widely used in practice,and thus short of case studies for design and construction of stress-ribbon bridges.Accordingly,it is meaningful to further the study of stress-ribbon bridges.In this paper,the stress-ribbon bridge at Meihua Road in Zhuhai,China,is taken as an example for a case study,which is numerically analyzed with finite element method and Midas Civil software.The global stability,strength,deflection,stress at local part and frequency are checked in accordance with current domestic and foreign codes.Then,the vibration reduction design schemes using tuned mass damping(TMD)are compared and recommended.The results of the current study are able to serve as an example for application of stress-ribbon bridges.The numerical results show that the stability,strength,deflection,stress at local part can meet the requirements of the related domestic and foreign codes.When TMD is applied at the mid-span of the bridge,the maximum vertical and transverse vibration are decreased by 87.6% and 87.9%,respectively,meeting the requirement of CL1.

关 键 词：悬带人行天桥 有限元分析 全桥受力性能分析 减振设计 调谐质量阻尼器 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.11[交通运输工程—道路与铁道工程]