曲线钢桁桥人致振动舒适性评价现场试验研究  

Field Testing of Human-induced Vibration Comfort in Curved Steel Truss Bridges

作　　者：温青[1,2] 何泳霖[1] 周越 曹张 华旭刚 孙洪鑫[1] WEN Qing;HE Yonglin;ZHOU Yue;CAO Zhang;HUA Xugang;SUN Hongxin(Hunan Provincial Key Laboratory of Structures for Wind Engineering and Vibrational Control,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]湖南科技大学结构抗风与振动控制湖南省重点实验室,湖南湘潭411201 [2]湖南大学风工程与桥梁工程湖南省重点实验室,长沙410082

出　　处：《噪声与振动控制》2024年第6期236-241,共6页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(52378511);湖南省自然科学基金资助项目(2021JJ40208,2021JJ10003);长沙市政府采购研究资助项目(CSCG-202107060066)。

摘　　要：大跨曲线钢桁梁人行桥竖向、横向和扭转振型耦合强,人致振动舒适度评价和减振控制难度大。以湖南省长沙市浏阳河一主跨为120 m的曲线双层桥面三跨连续钢桁梁桥—汉桥为工程背景,通过理论分析和人群激励现场动力试验,识别桥梁固有模态参数,评价人致振动舒适性,优化设计调谐质量阻尼器(Tuned Mass Damper,TMD)并评价TMD的减振效果。研究表明:因桥梁第一阶竖弯模态和第一阶扭转模态的阻尼比仅为0.23%和0.3%,人致振动加速度不满足舒适性要求;采用竖向TMD进行竖弯模态和扭转模态的减振控制,减振后的桥梁满足舒适性要求。It is difficult to evaluate human-induced vibration comfort and control vibration damping on a large-span curved steel truss bridge with strong coupling of vertical,lateral and torsional vibration modes.In this work,a 120 m curved double deck three-span continuous steel truss bridge over Liuyang River in Changsha city was taken as the engineering project.The natural modal parameters of the bridge was identified,the human-induced vibration comfort was evaluated,the design of the tuned mass damper(TMD)was optimized,and the vibration damping effect of the TMD was evaluated through theoretical analysis and field dynamic crowd-excited test.It is shown that the damping ratios of the first-order vertical and torsional modes are only 0.23%and 0.3%respectively,and the human-induced vibration acceleration does not meet the comfort requirements;after using the vertical TMD to control the damping of the vertical and torsional modes,the vibrationdamped bridge meets the comfort requirements.

关 键 词：振动与波 钢桁架梁桥 人致振动 现场实测 舒适性评价 人行桥 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]