【摘要】 通过建立层间隔震体系的两质点简化分析模型与多质点动力时程分析模型,提出层间隔震体系隔震层参数优化设计的方法,系统地研究了层间隔震体系当隔震层位置变化时其相应的减震工作机理,结果表明随着隔震层位置下移,层间隔震体系减震机理由TMD调谐逐步过渡为隔震耗能,在结构动力特性上体现为前两阶模态质量参与系数的比例发生变化。最后通过某10层框架结构的仿真分析,验证了层间隔震体系在控制地震下反应的有效性,并发现隔震层位置越低减震效果越明显,隔震层的阻尼能够有效地抑制隔震层下部子结构的反应。更多还原

【Abstract】 A story isolation system is modeled by a simple theoretical two degree of freedom model and a multi-degree of freedom model of dynamic response analysis,respectively.A procedure is proposed for optimal design of isolator parameters of a story isolation system.The control mechanism of the story isolation system is systematically investigated for various isolation levels.The results demonstrate that the working mechanism of the story isolation system changes from frequency modulation to energy dissipation when the isolation level is from the roof to the bottom of the structure,while the ratios of the first two modal mass participation factors are quite different.A 10-story frame structure is employed in a numerical example to investigate the effectiveness of the story isolation on seismic response reduction,and the results indicate that the story isolation system with lower isolation level may achieve a higher level of response reduction and the seismic response of the substructure below the isolation level may be well attenuated by increasing the damping of the isolation level.更多还原