TMD对人行桥疲劳寿命的影响研究  

Effect of TMD on fatigue life of steel-glass footbridge model

作　　者：马法荣 朱前坤[2] 蒲兴龙 杜永峰[2] MA Fa-rong;ZHU Qian-kun;PU Xing-long;DU Yong-feng(School of Civil Engineering,Hexi University,Zhangye 734000,China;Institute of Earthquake Prevention and Disaster Reduction,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]河西学院土木工程学院,甘肃张掖734000 [2]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《振动工程学报》2024年第6期928-936,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51868046);甘肃省青年科技基金计划项目(21JR7RA557);河西学院青年教师科研基金项目(QN2021020)。

摘　　要：针对人群运动导致人行结构振动过大而日益突出的疲劳破坏问题,可供参考的研究成果甚少。本文以钢-玻璃人行桥为试验平台开展关于安装TMD前后人致人行桥疲劳性能的研究,采用APS400电子激振器激励模拟人行荷载,通过长期应变监测数据,分析得出了该结构下的疲劳应力谱以及日平均损伤度,进而预估其疲劳寿命。结果表明:安装TMD后,结构1/2处的加速度峰值由0.15 m/s²减少到0.084 m/s²,减振率达44.0%;位移峰值由2.98 mm减少到0.92 mm,减振率达69.1%;应变幅值由40με减少到13με,减振率达67.5%。结构跨中处等效应力幅值最大,疲劳寿命最短,为74年;安装TMD后,结构跨中处疲劳寿命为2880年,延长近39倍,其他测点处依次延长了3.95倍、7.41倍。Research on the increasingly significant issue of fatigue failure in pedestrian structures due to crowd-induced vibrations is limited.This paper uses a steel-glass footbridge as a test platform to study the fatigue performance of the footbridge before and after the installation of a Tuned Mass Damper(TMD).The APS400 electronic shaker is used to simulate pedestrian load,and long-term strain monitoring data is analyzed to determine the fatigue stress spectrum and daily average damage degree of the structure,which is then used to estimate its fatigue life.The results show that the installation of the TMD reduced the peak acceleration at half of the structure from 0.15 m/s²to 0.084 m/s²,a vibration reduction rate of 44.0%.The peak displacement was reduced from 2.98 mm to 0.92 mm,a vibration reduction rate of 69.1%;and the strain amplitude was reduced from 40 to 13,a vibration reduc-tion rate of 67.5%.The amplitude of the equivalent effect force across the middle of the structure is the largest,and the fatigue life is the shortest,at 74 years.After the installation of the TMD,the fatigue life of the structure span increased to 2880 years,nearly 39 times longer,and the fatigue life at other measurement points extended by 3.95 times and 7.41 times.

关 键 词：钢-玻璃人行桥 疲劳破坏 应变监测 疲劳应力谱 疲劳寿命 

分 类 号：U448.11[建筑科学—桥梁与隧道工程] O346.2[交通运输工程—道路与铁道工程]