双段消能摇摆结构体系弹性地震反应的简化分析模型及参数分析

Simplified Model and Parametric Study on a Dual-Rocking Structural System with Dampers Based on Elastic Dynamic Response

双段消能摇摆结构体系是基于单段摇摆结构体系应用于高层建筑的发展,由两段串联的摇摆结构、主体结构、刚性连杆以及位移型阻尼器组成,可以减小高层建筑结构在地震作用下的动力响应,控制主体结构变形更加均匀,并削弱结构高阶振型的影响,提高结构的抗震性能。基于双段消能摇摆结构体系的刚度组成,建立了双自由度简化分析模型,并结合有限元分析模型进行验证。提出了影响双段消能摇摆结构体系弹性地震反应的无量纲控制参数,结合参数分析的结果,给出了无量纲控制参数的建议范围。研究表明,双自由度简化分析模型可以准确模拟双段消能摇摆结构体系的弹性地震反应,并较准确地反映了主体结构刚度、阻尼器刚度对结构弹性动力响应的影响,降低结构的计算成本;相比于单段摇摆结构,双段摇摆结构能够减小高层建筑下段结构的弹性地震反应,提高高层建筑的抗震性能。

Dual-rocking structural system with displacement-related dampers is an improvement of single-rocking structural system with displacement-related dampers for practical application in high-rise buildings.Dual-rocking structural system consists of two rocking structures in series,main frame,rigid link and displacement-related dampers.They are capable of reducing dynamic response,forcing the whole structure to deform uniformly and decrease the influence of high modes,which can improve seismic behavior.Based on the stiffness constituent,double-DOF simplified model is built and verified with finite element model.Key dimensionless control parameters are proposed and the application range is recommended based on the results of parametric studies.According to the analysis,double-DOF simplified analysis model is able to simulate elastic dynamic response of dual-rocking structural system with displacement-related dampers,and to reflect the influence of the stiffness of main frame and damper accurately and reduce calculation cost.Comparing to single-rocking structure,dual-rocking structure is capable of reducing the seismic response of lower structure and improve the seismic behavior of high-rise buildings.