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层间隔震结构在近场脉冲型强震作用下,隔震层易发生过大变形,导致隔震层上部结构倾覆失稳.提出隔震层限位保护系统,进行软碰撞限位.采用Kelvin碰撞模型建立限位保护系统的力学模型与带限位层间隔震的力学模型,推导带限位层间隔震的动力方程.对比分析有、无限位保护系统的层间隔震结构的动力响应,分析限位弹簧的不同预留距离、不同限位刚度对隔震层最大变形和层间弹塑性位移的影响.探讨带限位的层间隔震结构在超越预估强烈地震时的碰撞反应.结果表明:隔震层限位保护系统不影响层间隔震结构在多遇地震下的减震效果,且能有效限制隔震层在强烈地震下的最大变形,避免隔震支座破坏而导致上部结构倾覆失稳;限位弹簧的不同预留距离、不同限位刚度对隔震层最大变形与隔震结构层间弹塑性位移产生很大影响;在超越预估的强烈地震作用下,限位保护系统亦能限制了隔震层最大变形,使隔震结构破坏模式由隔震层瞬间破坏转变为隔震结构塑性破坏.
Seismic layered earthquake structure under the action of near-field pulsed strong earthquakes, earthquake isolation layer prone to excessive deformation, resulting in the overturning instability of the upper part of the isolation layer. Isolation layer limit protection system, soft collision limit. Kelvin The collision model was used to establish the mechanical model of the limit protection system and the mechanical model with spacing of the spacing layer. The dynamic equations with the spacing of the spacing layer were deduced. The dynamic responses of the layered isolation structure with the infinite protection system were compared and analyzed. The effects of different reserve distances and different limit stiffnesses of limit springs on the maximum deformation and elastic-plastic displacement of the seismic isolation layer. The collision response of the layered earthquake-isolated structure with limit position when exceeding the predicted strong earthquake is discussed. The results show that : Isolation layer limit protection system does not affect the seismic isolation effect of layered structures under multiple earthquakes, and can effectively limit the maximum deformation of seismic isolation layer under strong earthquakes, and avoid the destruction of seismic isolation bearings and cause the overturning of superstructures. Instability; different reserved distances and different limit stiffnesses of limit springs have a great influence on the maximum deformation of the isolation layer and the elastic-plastic displacement between layers of the isolation structure; the limit is limited by strong earthquakes beyond the prediction. The protection system can also limit the maximum deformation of the seismic isolation layer, so that the failure mode of the isolation structure is changed from the instantaneous failure of the isolation layer to the plastic failure of the isolation structure.