【摘要】 针对高层结构体系的风振控制,引入瑞雷阻尼算法对其进行风振优化分析。介绍了MPD(mass proportional damping)和SPD(stiffness proportional damping)2种结构体系,阐述了MPD结构体系和SPD结构体系用于结构风振控制的基本原理,给出了风振作用下2种结构体系进行对比分析的约束条件,研究了2种结构体系的阻尼特性,从理论上推导证明了MPD和SPD体系的结构阻尼比ξiMPD与ξiSPD之间的大小关系,并针对结构风振效应的频域分析法编制Matlab程序对设置MPD和SPD体系的某高层结构进行风振控制优化分析。研究表明对于任一N层结构体系,当考虑一阶振型或前几阶振型时,设置MPD体系的结构阻尼比均大于SPD结构体系,且MPD结构体系对高层结构风致振动的减振效果明显优于SPD结构体系,因而文中提出的基于瑞雷阻尼算法的风振控制方法对于抑制高层结构的风致振动是合理有效的,为高层结构风振控制提供了新途径。更多还原

【Abstract】 Optimum method of wind-induced vibration control of high-rise building is studied in this paper. Rayleigh Damping arithmetic is firstly employed and proposed to perform optimum study. Two kinds of optimum system,MPD(Mass proportional damping) and SPD(Stiffness proportional damping),are developed according to Rayleigh Damping arithmetic and their control principles are introduced. The constraint condition and damping characteristics of the MPD and SPD are prescribed and studied in order to continue structural dynamic contrast analysis under wind excitation. The relationship of structural damping ratio( MPD ξ i,SPD ξ i) between the MPD and SPD is proved theoretically. Structural frequency-domain analysis programs are developed based on Matlab software to calculate wind-induced responses of the two optimum systems. The results show that the structural damping ratio of the MPD system is greater than the SPD system for any N-story structure when considering the first mode or the first several modes. The control effect of the MPD system is superior to the SPD system in reducing structural dynamic responses under wind excitation. So,the wind-induced vibration control method base on Rayleigh Damping arithmetic is reasonable and effective in reducing wind responses and will be a new control strategy of high-rise buildings.更多还原