核筒悬挂结构随机动力响应的参数优化设计

PARAMETER OPTIMIZATION OF RANDOM RESPONSE FOR CORE-TUBE BUILDINGS WITH SUSPENSION STRUCTURE

高层建筑核筒悬挂结构是在核筒与悬挂框架之间设置阻尼器,以减小地震作用下的结构动力响应。在频域内应用复模态叠加与虚拟激励相结合的方法,建立悬挂减振结构的随机地震响应分析方法,在此基础上针对一个典型的算例,以核筒顶点位移、悬挂框架层间位移为优化目标,给出核筒与悬挂框架间阻尼器连接和弹簧连接的合理布置方案及参数优化结果。研究表明,选择在核筒与悬挂框架间综合设置弹簧连接和阻尼器连接,并合理地选择相应的参数,可以显著地提高结构体系的消能减振效果。

As an innovative vibration-control system,core-tube buildings with suspension structures have been evoking the attention of researchers,in which the dampers are set between the core-tube and suspended frames to reduce the dynamic response of core-tube suspension structures under seismic loads.Random seismic response of a single core-tube suspension structure was then determined by a combination of the complex modal superposition method and pseudo-excitation method in the frequency domain.Then optimization of arrangement scheme and parameters for damper connection and spring connection was performed to achieve the minimum core-tube top displacement and minimum storey drift of suspended frames.Results showed that properly using damper connections and spring connections between the core-tube and suspended frames could reduce random seismic responses significantly.