基于MTMD的大跨人行悬索桥减振措施研究  

Study on Vibration Reduction Measures of Long-Span Pedestrian Suspension Bridge Based on MTMD

作　　者：张彦玲[1,2] 程艺 王泽涵 王昂洋 Zhang Yanling;Cheng Yi;Wang Zehan;Wang Angyang(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Cangzhou Power Supply Branch of State Grid Hebei Electric Power Co.Ltd.,Cangzhou 061000,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043 [3]国网河北省电力有限公司沧州市供电分公司,河北沧州061000

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第3期1-10,共10页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51778377);河北省大型结构健康诊断与控制重点实验室开放基金(KLLSHMC2112)。

摘　　要：为了研究多重调谐质量阻尼器装置(MTMD)在大跨人行悬索桥上的减振效果,依托某景区大跨人行悬索桥,采用Midas/Civil建立了有限元模型,根据行人步频范围内的桥梁自振频率进行了人致振动和行人舒适度分析;采用MTMD进行了人行悬索桥的竖向减振分析,通过MTMD系统的参数优化,对减振效果进行了研究。研究表明,主梁加速度极值随行人密度的增加而增大,计入人群质量后加速度极值减小,不同行人步频下主梁加速度极值受加载模态振型和荷载折减系数ψ的影响;以根据受控频率得到的MTMD系统参数为基准,随着参数比例系数的增加,主梁竖向加速度最大值减小,减振率增大,但最优参数需根据减振率和系统总质量综合确定;安装MTMD系统后,人行悬索桥主梁受控频率下的最大减振率达到39.1%,说明MTMD系统的减振效果明显。研究内容可对同类结构的减振措施提供参考。In order to study the vibration reduction effect of multiple tuned mass damper device(MTMD)on long-span pedestrian suspension bridge,based on a scenic spot long-span pedestrian suspension bridge,a finite element model was established by MIDAS/Civil,and the human induced vibration and pedestrian comfort were analyzed according to the bridge natural vibration frequency within the pedestrian step frequency range.The vertical damping analysis of pedestrian suspension bridge was carried out by using MTMD,and the damping effect was studied through the parameter optimization of MTMD system.The results show that the acceleration extreme value of the main beam increases with the increase of pedestrian density,and decreases after taking into account the crowd mass.The acceleration extreme value of the main beam under different pedestrian gait frequencies is affected by the impact of loading mode shape and load reduction coefficientψ.Based on the MTMD system parameters obtained from the controlled frequency,with the increase of the parameter proportion coefficient,the maximum vertical acceleration of the main beam decreases and the vibration reduction rate increases,but the optimal parameters need to be determined comprehensively according to the vibration reduction rate and the total mass of the system.After installing the MTMD system,the maximum vibration reduction rate of the main beam of the pedestrian suspension bridge under the controlled frequency in this paper reaches 39.1%,indicating that the vibration reduction effect of the MTMD system is obvious.The research content of this paper can provide reference for the vibration reduction measures of similar structures.

关 键 词：桥梁工程 人行悬索桥 人致振动 减振分析 多重调谐质量阻尼器 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]