多点激励下巨型框架悬挂减振结构地震响应振动台阵试验研究

目前对于大跨度高层悬挂减振结构在多点激励下的地震响应尚缺乏试验研究。本文按1/20比例设计和制作一座大跨度巨型框架悬挂减振结构模型,并通过双振动台模拟试验,研究一致激励和行波激励对悬挂减振结构地震响应的影响。试验结果表明:行波效应可能使模型结构的关键部产生明显的应力变化,主体结构顶部和次结构顶层悬挂楼盖沿X方向加速度响应有所减小;同时发现首层悬挂楼盖加速度响应及与主体结构的相对位移比顶层明显。这对研究大跨度高层悬挂减振结构抗震提供了新的思路,因此可以考虑行波效应对此类结构的减振作用进行抗震设计构思。

Shaking tables test study on seismic responses of mega-frame vibration reduction suspended structures under multi-support excitations

At present,there is a lack of experimental study on the seismic response of long-span high-rise suspension structures under multi-point excitation.A large span mega frame suspension vibration damping structure model is designed and manufactured according to the ratio of 1/20,and the influence of uniform excitation and traveling wave excitation on the seismic response of suspension vibration damping structure is studied through the simulation test of double vibration table.The experimental results show that the traveling wave effect may cause significant stress changes in the key parts of the model structure,and the acceleration response of the suspended floor in the top of the main structure and the substructure decreases along the X direction.At the same time,it is found that the acceleration response and relative displacement of the suspended floor are more obvious than those of the top floor.This provides a new way to study the seismic behavior of long-span high-rise suspension structures,so the seismic design of such structures can be designed by considering the traveling wave effect.