核筒悬挂结构随机动力响应的参数优化设计
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摘要
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.
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.
引文
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11 Zhang W S,Xu Y L.Dynamic Characteristics and Seismic Response ofAdjacent Buildings Linked by Discrete Dampers.EarthquakeEngineering and Structural Dynamics,1999,28(10):1 163-1 185
2 Xu Y L,He Q,Ko J M.Dynamic Response of Damper-ConnectedAdjacent Buildings Under Earthquake Excitation.EngineeringStructures,1999,21(2):135-148
3王春林,吕志涛.核筒悬挂结构的动力特性及参数优化.东南大学学报(自然科学版),2007,37(2):1-5
4刘郁馨,吕志涛.单段核筒悬挂结构频率响应分析.南京建筑工程学院学报,1999,51(4):1-9
5夏逸鸣,张韫美,赵惠麟.悬挂式层间减震结构地震反应的比较分析.工程力学,2000,17(6):73-81
6周坚,伍孝波.核筒悬挂结构体系自振特性研究.工程力学,2005,22(1):75-81
7王勖成.有限单元法.北京:清华大学出版社,2003:509-512
8 Clough R W,Penzien J.Dynamic of Structures.Berkeley,CA:Computers&Structures,Inc.,1995:234-236
9李德葆,陆秋海.实验模态分析及其应用.北京:科学出版社,2001:78-82
10林家浩,张亚辉.随机振动的虚拟激励法.北京:科学出版社,2004:42-49
11 Zhang W S,Xu Y L.Dynamic Characteristics and Seismic Response ofAdjacent Buildings Linked by Discrete Dampers.EarthquakeEngineering and Structural Dynamics,1999,28(10):1 163-1 185
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