基于NSGA-Ⅱ的巨-子结构层间隔震体系优化分析  

Optimization analysis of mega-substructure inter-story isolation system based on NSGA-Ⅱ algorithm

作　　者：刘良坤[1] 谭平[1] 李祥秀[2] 张颖[1] 周福霖[1,2] 

机构地区：[1]广州大学工程抗震研究中心,广东广州510405 [2]北京工业大学建筑工程学院,北京100124

出　　处：《地震工程与工程振动》2013年第6期187-193,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家973项目(2011CB013606);国家基金委面上项目(51208129);国家教育部新世纪人才项目(NCET-11-0914);国家教育部博士点基金项目(20104410110002);广州市羊城学者科技计划项目(10A032D)

摘　　要：对巨-子结构中子结构采用层间隔震策略,形成巨-子结构层间隔震体系。建立了该新型隔震体系的分析模型与运动方程,采用复模态方法在随机域内推导了该体系的随机地震响应方差。基于NSGA-Ⅱ算法提出了巨-子结构层间隔震体系参数优化流程,仿真分析表明了该优化设计方法的准确性与高效性。对巨-子结构层间隔震体系的进一步研究表明,随子结构质量比增大,其减震工作机理也相应地从调谐转化为耗能隔震。此外,时程分析也表明巨-子结构采用层间隔震策略后,主结构和子结构的地震响应均得到了较好的控制,且体系的输入能、动能、变形能和主结构自身耗能均有较大程度的下降。The paper proposes a mega-substructure inter-story isolation system, in which the substructure is de- signed to be isolated from the mega-structure by flexible isolators. A simplified analytical model of the mega-sub- structure inter-story isolation system is developed, and the governing equation of the new inter-story isolation system is formulated. Complex mode analysis method is used to derive the random response of mega-substructure inter-story isolation system. An optimal procedure for mega-substructure inter-story isolation system is put forward on the basis of NSGA algorithms. Numerical simulation shows that the proposed optimal procedure for the new isolation system is accurate and efficient. Further research shows that with increase in substructure mass, its work mechanism is changed from tuned vibration absorber, energy dissipation to seismic isolation. Time history analysis of the mega- substructure inter-story isolation system shows that both drift of primary structure and absolute acceleration of sub- structure are attenuated significantly. In contrast with traditional mega-substructure, input energy, kinetic energy, dissipated energy and deformation energy in mega-substructure inter-story isolation system are greatly reduced.

关 键 词：巨-子结构 层间隔震体系 NSGA-1Ⅱ 复模态 随机振动 优化分析 

分 类 号：TU311[建筑科学—结构工程] TU352.12