大跨度单索面曲线悬索桥人致振动舒适性及减振措施研究  

Research on User Comfort and Human-Induced Vibration Mitigation Measures for Long-Span Curved Suspension Footbridge with Single Cable Plane

作　　者：刘世忠[1] 于洪波 陈斌[1] 陈缔欣 傅立磊 LIU Shi-zhong;YU Hong-bo;CHEN Bin;CHEN Di-xin;FU Li-lei(Lanzhou Jiaotong University,Lanzhou 730070,China;Xiamen Municipal Construction and Development Co.,Ltd.,Xiamen 360060,China;Xiamen Municipal Engineering Design Institute Co.,Ltd.,Xiamen 360060,China)

机构地区：[1]兰州交通大学,甘肃兰州730070 [2]厦门市市政建设开发有限公司,福建厦门360060 [3]厦门市市政工程设计院有限公司,福建厦门360060

出　　处：《世界桥梁》2021年第3期72-77,共6页World Bridges

基　　金：国家自然科学基金项目(51568036,51869040)。

摘　　要：随着桥梁美学和城市景观的追求以及新型轻质高强材料的运用,人行桥梁的跨度不断增大,基频不断降低,带来的人致振动问题也日益突出。以厦门山海健康步道节点二桥梁——单塔单索面曲线悬索桥为背景,通过行人激励下人致振动响应,分析人致振动峰值加速度和侧向锁定及其临界人数,并对安装调谐质量阻尼器(TMD)减振方案进行参数优化。结果表明:在人致振动竖向敏感频率范围内,即3 Hz以内,共有19阶模态,且模态振型耦合现象严重,不仅有主梁与桥塔、主缆耦合振型,还有主梁竖向与侧向耦合振型;第10阶和第15阶人致振动加速度峰值分别为2.127 m/s^(2)、3.778 m/s^(2),超出CL1级舒适性指标,第7阶临界锁定人数为236人,小于设计人数1235人;提出安装TMD并优化其基本参数,安装TMD后桥梁满足人致振动CL1级舒适性要求。Bridges are also regarded as signatures of a city,therefore,aesthetic effect of bridge structures has increasingly been concerned.The utilization of new light-weight and high-strength materials leads to the gradually increasing span lengths and lower natural frequencies of footbridges.As a result,the human-induced vibration issue has become more and more striking.In this paper,the No.2 bridge of the Shanhai Health Path in Xiamen,which is a single tower curved suspension bridge with a single cable plane,is taken as a study case.The peak acceleration of human-induced vibrations,lateral locking and threshold number of people on the bridge were analyzed.And the parameters of the tuned mass dampers(TMDs)installed for vibration mitigation were optimized.The results showed that 19 modes were observed within the range of sensitive vertical frequencies of human-induced vibrations,namely when the frequencies were below 3 Hz,and the modes coupling phenomenon was severe,besides the coupling vibrations of the main girder,tower and main cable,the vertical and lateral coupling vibrations of main girder were also identified.The peak accelerations of the 10th and 15th human-induced vibrations were 2.127 m/s^(2)and 3.778 m/s^(2),respectively,exceeding the CL1 comfort criteria.The locking number of people in the 7th mode were 236,less than the design number of 1235.It was proposed to install TMDs for vibration mitigation,and the parameters of TMDs should be optimized.The comfort of the footbridge with TMDs reaches the CL1 comfort requirements.

关 键 词：人行桥 单塔单索面曲线悬索桥 人致振动 舒适性评价 调谐质量阻尼器 减振措施 

分 类 号：U448.11[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]