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通过建立层间隔震结构的两质点分析模型,考察了上、下部结构的质量比、频率比等参数对体系动力特性及地震反应的影响,探讨参数变化对隔震系统减震效果的影响规律。研究分析表明:随着隔震层位置的下移,结构一阶模态质量参与系数逐渐变大,体系减震机理由调谐质量阻尼器逐渐过渡为基础隔震;对上、下部结构响应的控制,存在最优频率比。最后通过对一个两质点结构的时程分析,验证了上述理论分析的正确性。
Through the establishment of the two-mass point analysis model of the layered isolation structure, the influence of the parameters such as mass ratio and frequency ratio of the upper and lower structures on the dynamic characteristics and seismic response of the system is investigated. The influence of the parameter variation on the damping effect of the isolation system is discussed. The research shows that the first-order modal mass participation coefficient of the structure gradually increases with the downward movement of the isolation layer, and the damping mechanism of the system gradually changes from the tuned mass damper to the base isolation. The control of the response of the upper and lower structures , There is an optimal frequency ratio. Finally, the correctness of the above theoretical analysis is verified by analyzing the time history of a two-mass point structure.