外套加层结构中的隔震支座优化参数研究

Parameter Optimization Design of Isolator in Structure with External Frame and Added Floors

对隔震技术在分离式外套框架加层结构中的应用进行了研究,研究结果表明可通过理论表达式得到初步设计时隔震支座的优化参数。采用线性弹簧和线性阻尼器并联的模型模拟橡胶支座,并采用Bouc-Wen模型描述结构的滞回特性。在数值算例中,对不同加速度峰值和不同地震波激励下的外套框架加层结构进行了非线性动力分析,得到了隔震支座的优化刚度和阻尼系数,该结果与理论表达式得到的优化阻尼系数一致,大量的数值分析结果表明在一定范围内,隔震支座的刚度取值对其耗能减震效果影响不大,说明隔震技术在分离式外套框架加层结构中的应用具有较大的优势,隔震支座阻尼系数初步设计值可通过理论表达式求得,可为工程师的初步设计提供参考,有利于这种加层结构体系的推广应用。

The application of seismic isolation technology in separated structure with exte rnal frame and added floors is studied.The results showed that the optimal para meter of isolator can be achieved through theory expressions.The seismic isolat or is modeled as a spring and a viscous dashpot which are combined in parallel. The structural nonlinearity is characterized by Bouc-Wen model.In the numerical example,the nonlinear dynamic response of structure with external and added fl oors is analyzed,while the structure subjected to different earthquake records with different peak ground acceleration（PGA）.The optimal parameters of isolato r are selected in the results which obtained through extensive parametric studie s.It can be found that the optimal damping coefficient of isolator is consisten t with the theory results.The extensive numerical results also show that the in itial stiffness of bilinear isolator has little influence on the seismic energy dissipation performance,which demonstrates that seismic isolation technology in structure with external and added floors.The theory formula can help engineers in preliminary designing.These advantages benefit to the application of this s tructure system with added floors.