基于简化模型的北京奥林匹克中心演播塔MTMD风振控制研究  

MTMD wind-induced vibration control of Beijing Olympic Center Broadcast Tower based on its simplified model

作　　者：黄瑞新[1,2] 李爱群[2] 张志强[2] 

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212003 [2]东南大学土木工程学院,江苏南京210096

出　　处：《建筑结构学报》2010年第S2期131-136,共6页Journal of Building Structures

基　　金：国家"十一五"科技支撑计划项目(2006BAJ03A04)

摘　　要：研究了多重调谐质量阻尼器MTMD对北京奥林匹克公园中心演播塔在脉动风作用下风振响应的振动控制效果。基于随机振动理论,利用Shinozuka方法对该塔的脉动风荷载进行数值模拟,得到了6条脉动风荷载时程曲线;利用有限元软件SAP2000建立了该塔的三维模型,并对该塔进行了动力特性分析,将该塔的三维空间模型简化为二维模型;在此脉动风荷载作用下,二维模型的计算结果和SAP2000三维空间模型的计算结果相吻合,从而验证了二维模型的正确性和可靠性,而且利用二维模型进行减振控制研究,有效地节省了计算时间;利用6条脉动风荷载时程曲线,对该塔的风振响应进行了MTMD振动控制研究,以该塔顶层的风振响应为优化目标,对MTMD的参数进行了优化研究。结果表明,该塔的加速度风振响应超过了规范的容许值,设置MTMD后该塔的风振加速度响应有明显的减小;最优参数的MTMD对该塔的风振加速度响应和位移响应的减振率分别为29.5%和45.7%。MTMD吸收了大量的能量,对该塔的风振响应有明显的控制作用。In the paper,Beijing Olympic Center Broadcast Tower is taken as a project case to investigate wind-induced vibration control with multiple tuned mass damper(MTMD) under the fluctuation load.First of all,based on the random vibration theory,fluctuating wind load of this tower is simulated by means of Shinozuka method,and 6 correlated time history curves are obtained.Secondly,by use of finite element software-SAP2000,a 3D finite element model of the tower is created and modal analysis of the tower is performed.Thirdly,the 3D model of the Tower is simplified to a 2D model.Employing the simulated wind load curves,the calculated results of the 2D model coincide with the results of the 3D model,thus the accuracy and reliability of the 2D model is verified,and the calculation time is greatly reduced.Finally,utilizing these curves,the vibration control of the tower is studied and the optimal MTMD coefficients are obtained regarding the wind-included responses of upper story as optimization objectives.The analysis results show that the maximum peak acceleration response of the tower under dynamic wind load is far beyond the allowable value of the code,the wind-included responses are decreased greatly with MTMD,and the peak acceleration and displacement wind-responses of the upper story are reduced respectively by 29.5% and 45.7% with the optimal parameters of MTMD.MTMD dissipates a large amount of input energy and plays an important pole in the wind-induced vibration of the tower.

关 键 词：高耸结构 风振响应 多重调谐质量阻尼器 风振控制 

分 类 号：TU392.6[建筑科学—结构工程]