首页|悬臂梁式自适应调谐质量阻尼器对人行桥减振效果研究

悬臂梁式自适应调谐质量阻尼器对人行桥减振效果研究

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为了减小体型轻柔的人行桥的竖向人致振动以提高其舒适度,常在其中增设调谐质量阻尼器(TMD).然而,传统的TMD对频率高度敏感,失调的TMD的控制作用会大为削弱.为了提高传统TMD对人致振动的控制性能,提出了悬臂梁式自适应TMD(CATMD),其可通过步进式推拉杆改变质量块在悬臂梁上的位置以重调其刚度,调节导体板与永磁铁之间的磁导间距以重调其电涡流阻尼比.首先介绍了CATMD的减振系统,以及其变刚度和变阻尼比的控制算法,然后进行了CATMD模型试验,以分析频率与质量块位置以及阻尼比与磁导间距的关系,并进行了人行桥模型的跑步激励减振试验,最后对试验中CATMD频率重调部分进行了数值模拟研究与参数敏感性分析.研究结果表明:CATMD能够准确地从TMD-桥耦合系统中解耦识别得到TMD的最优频率与阻尼比并进行参数调节;由于其可以自发重调谐自身的刚度与阻尼系数,因此较失调的TMD具有更好的人致振动控制效果,能够显著减小跑步激励引起的结构加速度响应,在最大值、整体均方根(RMS)值和最大连续每秒RMS值3个舒适度评估指标上均有良好的提高作用.
Vibration reduction effect of cantilever beam adaptive tuned mass damper on footbridge
To reduce vertical human-induced vibration of the slender footbridge and improve its serviceability,the tuned mass damper(TMD)is usually used in it.However,traditional TMD is highly sensitive to the frequency,and the control effect of mistuned TMD is greatly weakened.To improve the human-induced vibration control performance of a traditional TMD,a cantilever-beam adaptive TMD(CATMD)was proposed.The stiffness can be adjusted by changing the position of the mass on the cantilever beam through the step putter,and the permeability distance between the conductor plate and the permanent magnet can be retuned to change the eddy current damping ratio.The vibration reduction system of CATMD was introduced first,and then the control algorithm of variable stiffness and variable damping ratio was introduced.The frequency and location of the mass,the damping ratio and air gap parametric discussions,parameter retuning experiments of CATMD and the vibration reduction test of the footbridge model under running-induced excitation were carried out.The numerical simulation on the reset frequency part of CATMD in the footbridge model test was carried out,as well as the parametric sensitivity discussion.Results show that CATMD can accurately identify the optimal frequency and damping ratio of TMD from the TMD-bridge coupling system and adjust the parameters.Because it can spontaneously retune its own stiffness and damping coefficient,it has a better human-induced vibration control effect than the mistuned TMD,can significantly reduce the structural acceleration response caused by running-induced excitation,and has a good improvement effect on three comfort evaluation indexes,for which are the maximum value,root mean square(RMS)value and maximum continuous RMS value per second.

adaptive tuned mass dampervariable stiffnesseddy current dampinghuman-induced vibrationfootbridge model testvibration reduction effect

王梁坤、周颖、施卫星

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同济大学结构防灾减灾工程系,上海 200092

同济大学土木工程防灾减灾全国重点实验室,上海 200092

自适应调谐质量阻尼器 变刚度 电涡流阻尼 人致振动 人行桥模型试验 减振效果

国家自然科学基金项目国家自然科学基金项目上海市浦江人才计划中央高校基本科研业务费专项资金

520250835230852622PJ14136000200121005/174

2024

10.14006/j.jzjgxb.2023.0350

建筑结构学报
中国建筑学会

建筑结构学报

CSTPCD北大核心
影响因子：1.546
ISSN：1000-6869
年,卷(期)：2024.45(9)