钢桁架人行桥舒适度分析与TMD减振设计  

Comfort Analysis and TMD Damping Design of Steel Truss Footbridge

作　　者：王富平 WANG Fuping(Gansu Transportation Science Research Institute Group Co.,Ltd,Lanzhou 730030,China;Gansu Key Laboratory of Health Monitoring and Safety Assessment Technology of Bridge and Tunnel,Lanzhou 730030,China)

机构地区：[1]甘肃省交通科学研究院集团有限公司,甘肃兰州730030 [2]甘肃省桥梁隧道健康监测与安全评估技术重点实验室,甘肃兰州730030

出　　处：《城市道桥与防洪》2025年第3期27-31,共5页Urban Roads Bridges & Flood Control

摘　　要：大跨度人行桥很难满足我国现行规范对人行桥竖向自振频率不小于3 Hz的要求,为了研究人行桥人致振动及舒适度评价标准,以某景区一座钢桁架人行景观桥为实例,利用MIDAS Civil软件建立有限元模型,对该桥进行动力特性分析。参照德国EN03规范,在不同行人密度下对桥梁结构进行加速度响应分析和舒适度评价,并通过优化调谐质量阻尼器TMD(Tuned Mass Damper,TMD)的参数,分析TMD的安装位置和数量对结构加速度响应的影响,确定合理的减振方案。结果表明:随着TMD质量比的增大,结构竖向加速度峰值减小,减振比增大,但减振效果并不是随着质量比的增大呈线性增长,当质量比大于2%时,减振效果已趋于平缓;结合工程实际,当质量比采用1%、跨中设置2个TMD时,结构舒适度达到“很舒适”等级,能有效控制人致振动。研究结果对同类型人行天桥的设计具有一定参考价值。Large-span footbridges are difficult to meet the requirements of current norms in China that the vertical natural frequency of footbridges should not be less than 3Hz.In order to study the human-induced vibration and comfort evaluation criteria of footbridges,taking a steel truss pedestrian landscape bridge in a scenic area as a case,a finite element model is established by using MIDAS Civil software for the analysis on the dynamic characteristics of the bridge.According to the German EN03 norm,the acceleration response analysis and comfort evaluation are carried out for the structure under different pedestrian densities.And by optimizing the parameters of tuned mass damper(TMD),the influence of TMD installation position and quantity on the acceleration response of the structure is analyzed,and the reasonable damping scheme is determined.The results show that with the increase of TMD mass ratio,the peak value of vertical acceleration of the structure decreases and the damping ratio increases.However,the damping effect does not increase linearly with the increase of mass ratio.When the mass ratio is greater than 2%,the damping effect has tended to be gentle.Combined with the engineering practice,the comfort of structure reaches a“very comfortable”level when the mass ratio is 1%and two TMD are set in mid-span,which can effectively control the human-induced vibration.The research results can provide some reference values for the design of similar footbridges.

关 键 词：人行桥 人致振动 有限元模型 舒适度评价 减振设计 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]