近场脉冲型地震动下层间隔震的非线性反应与隔震层限位分析

发布时间：2018-04-18 22:05

本文选题：近场脉冲型地震动 + 层间隔震　；参考：《应用基础与工程科学学报》2015年06期

【摘要】：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.
[Abstract]:The lower structure of the isolation layer is similar to the seismic system. It is easy to produce elastic-plastic deformation under the near-field pulsed ground motion, and the isolation layer is prone to excessive deformation, resulting in the toppling collapse of its superstructure.This paper presents a method of simulating near-field pulse-type ground motion by superposing equivalent pulses with the actual near-field non-pulse earthquake as the base wave.The dynamic response characteristics and parameters (pulse type, pulse participation coefficient) of LRB interlayer isolated structures under near-field pulsed ground motions and conventional ground motions (far-field or near-field non-pulsed ground motions) are studied.The effect of pulse period on nonlinear response of isolated structure and maximum deformation of isolation layer.In this paper, a viscous damper is added to the isolation layer to form an interlaminar mixture of LRB and viscous damper to protect the isolation layer, and the law of parameter optimization of the viscous damper is analyzed.The results show that compared with conventional ground motion, the nonlinear response and the maximum deformation of isolated layer of LRB structure under near-field pulsed ground motion are significantly increased, and the pulse type and pulse participation coefficient of near-field earthquake are obtained.Pulse period and PGV/PGA have great influence on the nonlinear response of LRB interstory isolated structure, the deformation of the isolation layer exceeds the allowable deformation of the isolation support, and by setting the viscous damper with appropriate parameters,Interstory mixed isolation can effectively reduce the nonlinear response and the deformation of the isolation layer, avoid the failure of the isolation support and lead to the toppling collapse of the superstructure.
【作者单位】：福建工程学院土木工程学院;湖南大学土木工程学院;福州大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378124,51108083) 福建省自然科学基金资助项目(2013J01169) 福建省教育厅项目(JK2012035) 福建工程学院科研项目(GY-Z11069)
【分类号】：TU352.12

【参考文献】