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对层间隔震体系地震响应的参数灵敏度研究,其目的在于定量评估各种不确定因素对结构响应的影响程度,从而获得不确定性参数对体系的影响规律。基于层间隔震体系两质点简化模型,建立了以基底剪力方差最小为优化目标的参数优化方法,采用NSGA-Ⅱ优化得到层间隔震体系在不同质量比下的最优频率比和最优阻尼比;考虑层间隔震体系物理参数的随机性,分别分析了层间隔震体系在平稳随机激励下随机结构绝对加速度响应、相对位移响应的参数灵敏度。对随机参数灵敏度和变异系数的分析,从另一层面解释了不同层间隔震体系的运动机理,并得到结构不同随机物理参数对结构响应的影响大小,提供了随机参量变化对体系响应的重要性排序,为调整结构体系参数、控制响应提供依据,同时为层间隔震体系响应灵敏度的进一步研究奠定基础。
The purpose of this study is to quantitatively evaluate the influence of various uncertainties on the structural response and to obtain the influence of the uncertainty parameters on the system. Based on the simplified model of two-point seismic isolation system, a parametric optimization method is proposed to minimize the variance of base shear. The optimal frequency ratio and optimal damping of the seismic isolation system at different mass ratios are obtained by NSGA-Ⅱ optimization Considering the randomness of the physical parameters of the layered seismic isolation system, the parameter sensitivity of the random seismic response and the relative displacement response of the layered seismic isolation system under steady random excitation are analyzed respectively. The analysis of the sensitivity and coefficient of variation of random parameters explains the motion mechanism of seismic isolation systems with different layers from another level and obtains the influence of different random physical parameters on the structural response and provides the importance of the change of random variables to the system response Sorting, to adjust the structural system parameters to provide a basis for controlling the response, while laying the foundation for further study of the response sensitivity of the layer isolation system.