摘要
GB 18036—2015《中国地震动参数区划图》中规定中国目前最高的地震烈度为9度极罕遇地震,然而某些巨震反应谱甚至远超中国最高地震烈度对应的反应谱,为了应对巨震灾害,有必要发展巨震作用下更为有效的减震技术。为此,将调谐惯容阻尼器和负刚度弹簧结合,设计一种具备负刚度的调谐惯容阻尼器(TID_NS),研究基础隔震TID_NS结构的优化设计和抗震性能。考虑隔震层的非线性本构行为,采用随机线性化技术处理非线性项,并采用Clough-Penzien功率谱模型。将LRB基础隔震结构体系简化为两自由度体系,并在隔震层附加TID_NS结构,提出三种不同的优化策略,研究在不同附加负刚度比下不同优化策略对减震性能的影响。采用人工波和土耳其7.8级地震记录作为输入地震波,分别对隔震结构进行非线性时程分析,结果表明:附加负刚度的TID_NS结构可以同时降低上部结构层间位移、隔震层位移比和上部结构加速度,当附加负刚度比为-0.1时,TID_NS结构相对基础隔震结构可以降低结构动力响应约15%。
The zoning map of GB 18036—2015‘Seismic ground motion parameters zonation map of China’stipulates that the highest seismic intensity in China is 9 degrees,and it’s design peak ground acceleration is 0.4g.However,the response spectrum of some giant earthquakes even far exceeds the response spectrum corresponding to the highest earthquake intensity in China.In order to deal with huge earthquake disasters,it is necessary to explore novel shock-absorbing technologies that are more effective under the action of giant earthquakes.For this purpose,a tuned inerter damper with negative stiffness(TID_NS)is designed by combining the tuned inerter damper with the negative stiffness spring.This paper studies the optimal design and seismic performance of base-isolated TID_NS structures.Considering the nonlinear constitutive behavior of the isolation layer,the stochastic linearization technique is used to deal with the nonlinear term,and the Clough-Penzien power spectrum model is adopted.The LRB base isolation structure system is simplified to a two-degree-of-freedom system,and a TID_NS structure is added to the isolation layer,and then three different optimization strategies are proposed to explore the impact of different optimization strategies on the seismic performance under different additional negative stiffness ratios.Using artificial waves and Turkish M7.8 earthquake records as input ground motions,the nonlinear time-history analysis of the isolation structure is carried out respectively.The research results show that in theory,the TID_NS structure with additional negative stiffness can simultaneously reduce the inter-story displacement of the superstructure,the displacement ratio of the isolation layer,and the acceleration of the superstructure.When the additional negative stiffness ratio is-0.1,the TID_NS structure can reduce the structural dynamic response by about 15%compared to the basic isolation structure.
作者
胡广杰
叶昆
HU Guangjie;YE Kun(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第S02期41-50,共10页
Journal of Building Structures
基金
国家自然科学基金项目(52078234)。
作者简介
胡广杰,出生于1999年,男,硕士研究生,主要从事结构减隔震研究。email:guangjiehu@qq.com;通信作者:叶昆,出生于1977年,男,工学博士,教授,主要从事结构减隔震研究。email:kun.ye@hust.edu.cn
