相邻结构减震优化分析

利用阻尼器连接相邻结构可减小结构地震反应,阻尼器参数的确定是减震设计的关键。根据随机振动理论,在白噪声激励下,以相邻结构的自振频率比、质量比为参数,推导了结构位移反应均方值与连接阻尼参数的关系式,分析了相邻结构的地震反应与频率比、质量比以及连接阻尼比的变化规律,从而得到了连接阻尼器的优化设计参数。最后在El Centro波、Taft波及人工波激励下,对比分析了某相邻10层建筑结构有连接和无连接时的地震反应,结果表明粘滞阻尼器连接相邻结构具有较好的减震效果。本文分析方法可供相邻结构减震设计参考。

Optimal Analysis of Vibration Mitigation in Adjacent Structures

The seismic response in adjacent structures linked by dampers may be reduced and the determination of parameters for the connected dampers is the key problem in seismic mitigation design.Taken the ratio of vibration frequency,the mass ratio of the adjacent structures as research parameters,the relational expression between the mean square deviation（MSD） of structural displacement and the parameters of linking dampers is derived by exciting the white noise based on the random vibration theory.Then,the changing law of the seismic response in adjacent structures with the parameters including the ratio of vibration frequency, the mass ratio and the ratio of linking dampers is presented and furthermore, the optimal parameters for the design of linking dampers are obtained. Finally, the seismic responses of two 10-story structures with or without connecting dampers, excited by El Centro, Taft and artificial waves,are eontrastively analyzed. The results show that the viscous dampers connecting adjacent structures are of a good vibration mitigation effect. The technique may be the reference to the seismic vibration control for adjacent structures.