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层间隔震的隔震层下部结构类似于抗震体系,其在近场脉冲型地震动下易产生弹塑性变形,且隔震层易发生过大变形,导致其上部结构倾覆失稳倒塌.提出以实际的近场非脉冲型地震为底波,叠加等效脉冲来模拟近场脉冲型地震动.研究在近场脉冲型地震动和常规地震动(远场或近场非脉冲地震动)作用下LRB层间隔震结构的动力反应特性与近场地震动特征参数(脉冲类型、脉冲参与系数、脉冲周期)对隔震结构非线性反应与隔震层最大变形的影响.提出在隔震层增设黏滞阻尼器,形成LRB与黏滞阻尼器相结合的层间混合隔震,对隔震层进行限位保护;并对黏滞阻尼器的参数优化规律进行了分析.结果表明:与常规地震动作用下相比,LRB层间隔震结构在近场脉冲型地震动下的非线性反应与隔震层最大变形均显著增加,近场地震的脉冲类型、脉冲参与系数、脉冲周期及PGV/PGA对LRB层间隔震结构的非线性响应有很大的影响,隔震层变形超越隔震支座容许变形;通过设置参数合适的黏滞阻尼器,层间混合隔震能有效降低非线性反应与隔震层变形,避免隔震支座破坏而导致上部结构倾覆失稳倒塌.
The lower part of the isolation structure is similar to the anti-seismic system, which is easy to produce elastic-plastic deformation under near-field impulsive ground motion and prone to over-deformation of the isolation layer, resulting in collapse of its superstructure collapse. The actual near-field and non-impulsive earthquakes are the bottom wave and the superposition of equivalent impulses to simulate the near-field impulsive ground motions.Researching the effects of near-field impulsive and conventional earthquakes (far-field or near-field non-impulsive earthquakes) Effects of Dynamic Response Characteristics of LRB Interlayer Seismic Structure and Characteristics of Near-field Ground Motion (Pulse Type, Pulse Coefficient, Pulse Period) on Nonlinear Response of Isolation Structure and Maximum Deformation of Seismic Isolation Layer. Dampers to form an interlaminar hybrid vibration isolation system with LRB and viscous dampers to limit the isolation of the isolation layer.And the parameters optimization of viscous dampers are analyzed.The results show that with the application of conventional seismic motion , The nonlinear response and the maximum deformation of the isolation layer of LRB interlaced seismic isolation structures in near-field impulsive ground motions are all significantly increased. The pulse types, pulse participation coefficients, pulse periods and PGV / Floor The nonlinear response of the seismic isolation structure has a great influence. The deformation of the seismic isolation layer exceeds the allowable deformation of the seismic isolation support. By setting the viscous damper with the appropriate parameters, the hybrid seismic isolation can effectively reduce the nonlinear response and the isolation layer Deformation, to avoid the destruction of isolation bearings and the collapse of the superstructure collapsed collapse.