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针对某钢结构登机桥的人致振动减振控制,采用结构减振控制理论,选取调频质量阻尼器(TMD)对结构进行人群荷载作用下的振动控制与舒适度设计。采用有限元分析软件MIDAS/Gen建立结构三维分析模型,对多种人群荷载工况输入下减振前后楼盖结构的动力响应进行时程分析;对大跨度楼盖动力特性与安装TMD前后的人群荷载下最大加速度响应进行现场振动测试,对减振前后结构的实测加速度响应进行对比分析。结果表明,采用TMD减振方案并根据实测结构动力特性调整其刚度可以使结构满足人群荷载作用下的舒适度要求,TMD起到了良好的减振效果。
Aiming at vibration damping control of a steel structure passenger boarding bridge, vibration control and comfort design of the structure under crowd load are selected by using the structure damping control theory and the frequency modulation mass damper (TMD). The finite element analysis software MIDAS / Gen was used to establish the three-dimensional model of the structure, and the time-history analysis of the dynamic response of the floor structure before and after vibration reduction was carried out under various load conditions. The dynamic characteristics of the long-span floor and the population before and after TMD installation The maximum acceleration response under load was used to carry out on-site vibration test, and the measured acceleration responses before and after vibration damping were compared. The results show that using TMD vibration damping scheme and adjusting its stiffness according to the measured dynamic characteristics of the structure can make the structure meet the comfort requirements under the crowd load, and TMD has a good damping effect.