大型超高钢结构电视塔基于MR-MTSD&MR-PTTMD联合作用的风振控制设计研究
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摘要
大型超高钢结构电视塔高度高、刚度小、上部空间狭小、风振响应较大,传统的多点调频弹簧阻尼器(MTSD)以及特大调频质量阻尼器(TMD)风振控制装置基本上不再适用。为此提出一种基于磁流变(MR)阻尼器的振动控制系统,将磁流变液多点调频弹簧阻尼器(MR-MTSD)与磁流变液悬挂水箱减振器(MR-PTTMD)作为控制阻尼器共同工作,用于控制此类结构的风振响应。以388m高河南省广播电视发射塔为例,考虑结构空间竖向相关性并采用修正的Davenport谱模拟脉动风速,对该塔进行风振时程响应动力分析,并对上述控制系统的控制参数进行优化设计。数值仿真结果表明,这种半主动控制策略对此类高耸钢塔结构在脉动风作用下的位移响应和加速度响应具有优良的控制品质和控制效果,大大降低此类结构风振控制设计的成本。
Wind-induced vibration of a large-scale high-rise steel TV tower is significant due to its height and slenderness,and should be under control.Because of the narrow and small upper space of the tower,traditional Multiple Tuned Spring Dampers(MTSD) as well as Tuned Mass Damper(TMD) control devices is no longer applicable.Therefore,a control system composed of MR dampers,named Multiple Tuned Spring Dampers(MR-MTSD) and Pendulous Tank Tuned Mass Dampers(MR-PTTMD),is proposed.The Davenport spectrum is employed to simulate the fluctuating wind load on the Henan steel TV tower,388m high,and analysis of wind-induced vibration response is carried out.Through numerical simulation analysis,optimal parameter design of the control system is also conducted.Numerical simulation results show that this innovative control strategy can significantly mitigate the wind-induced vibration responses,especially for wind-induced acceleration responses.
Wind-induced vibration of a large-scale high-rise steel TV tower is significant due to its height and slenderness,and should be under control.Because of the narrow and small upper space of the tower,traditional Multiple Tuned Spring Dampers(MTSD) as well as Tuned Mass Damper(TMD) control devices is no longer applicable.Therefore,a control system composed of MR dampers,named Multiple Tuned Spring Dampers(MR-MTSD) and Pendulous Tank Tuned Mass Dampers(MR-PTTMD),is proposed.The Davenport spectrum is employed to simulate the fluctuating wind load on the Henan steel TV tower,388m high,and analysis of wind-induced vibration response is carried out.Through numerical simulation analysis,optimal parameter design of the control system is also conducted.Numerical simulation results show that this innovative control strategy can significantly mitigate the wind-induced vibration responses,especially for wind-induced acceleration responses.
引文
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[8]谢翔东.单摆运动周期的近似解[J].内蒙古农业大学学报自然科学版,2003,24(4):115-118(Xie Xiang-dong.The approximate solution of the period of a simplependulum[J].Journal of Inner Mongolia agriculturalUniversity Natural Science Edition,2003,24(4):115-118(in Chinese))
[9]王之宏.风荷载的模拟研究[J].建筑结构学报,1994,22(1):35-39(Wang Zhihong.Research on wind loadsimulation[J].Building Structure Journal,1994,22(1):35-39(in Chinese))
[10]张相庭.结构风压和风振计算[M].上海:同济大学出版社,1985
[11]赵林.结构振动半主动控制及其实用性研究[D].天津:天津大学,2004(Zhao Lin.Study on the semi-activecontrol of structural vibration and its practicability[D].Tianjin:Tianjin University,2004(in Chinese))
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