黏滞阻尼器连接相邻结构减震优化分析

Optimal design of viscous dampers connecting adjacent structures

阻尼器参数的确定是利用阻尼器连接相邻结构进行减震设计的关键。根据随机地震反应理论,以相邻结构的频率比和质量比为参数,推导了结构位移反应均方差与连接阻尼比的关系式,得到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影响规律,从而得到了连接阻尼器的优化设计参数。根据自振频率相等的原则,探讨了将多自由度体系简化为单自由度体系的分析方法。最后在ElCentro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,表明黏滞阻尼器连接相邻结构具有较好的减震效果。本分析方法可供相邻结构减震设计参考。

Parameter determination of a connecting damper is the key problem of adjacent structural seismic mitigation design.Taken the vibration frequency ratio and mass ratio as research parameters,the formulation of mean square deviation displacement and linking damping ratio is derived based on the random vibration theory.Then the relationship of the adjacent structural seismic response versus the parameters including vibration frequency ratio,mass ration and linking damping ratio is presented.Furthermore,the optimal value of the linking viscous damping ratio is investigated.The method of simplifying MDOF system to SDOF system is developed according to the equivalent natural frequencies.Finally,the seismic responses of two 10-story structures with or without connecting dampers,excited by El Centro,Taft and artificial waves,are contrastively analyzed.The results indicate fine earthquake-mitigating effect of viscous dampers connecting adjacent structures.The analysis technique is the reference to seismic control of adjacent structures.