Inter Storey Isolation (ISI) shows promise for seismic vibration control in relatively tall buildings. With proper design, an ISI system isolates the upper storey block (USB) and emulates the effect of a nonconventional Tuned Mass Damper (TMD) on the Lower Storey Block (LSB) to reduce the seismic responses considerably. The vulnerability of conventional Base Isolation (BI) under pulse type motions was reported in the past. This study demonstrates the adverse effect of pulse type motions on the performance of ISI systems. An inclusive set of building configurations and bearing typology for the ISI system are employed and are subjected to two suites of unidirectional pulse and non-pulse type ground motions pertaining to varying hazard levels. Extensive nonlinear dynamic analysis of the frame-ISI systems are carried out. Representative statistics of the pertinent responses from each suite are contrasted to demarcate the effect of pulse type motions. The pulse type motions are shown to degenerate the efficiency of an ISI system to significantly amplify the seismic demands (and associated uncertainties) by allowing transmission of low frequency components (reminiscent of pulse(s)) to the response time histories. Response-specific amplification factors for the demands are assessed. The FEMA suggested guideline is shown to severely underestimates the bearing displacements, which is potentially dangerous. This deficiency is addressed by suggesting a modification factor in the FEMA formulae. The influence of the pulse period, mass ratio, damping in the bearing and hazard levels on the amplification of demands are discussed. However, this investigation considers a limited number of framing systems and isolation bearings subjected to a limited number of ground motions, which may be expanded in future study.

层间隔离（ISI）显示了在相对较高的建筑物中进行地震振动控制的希望。通过适当的设计，ISI系统可以隔离上层积木（USB），并模拟下层积木（LSB）上非常规调谐质量阻尼器（TMD）的效果，从而显着降低地震响应。过去已经报道了在脉冲类型运动下常规基础隔离（BI）的脆弱性。这项研究证明了脉冲型运动对ISI系统性能的不利影响。ISI系统采用了一套完整的建筑配置和轴承类型，并且要经受与变化的危险等级有关的两套单向脉冲和非脉冲型地面运动。对框架ISI系统进行了广泛的非线性动力学分析。比较每个套件相关响应的代表性统计数据，以划定脉冲类型运动的影响。通过允许将低频分量（让人想起脉冲）传输到响应时间历史中，脉冲型运动显示出降低了ISI系统的效率，从而极大地放大了地震需求（以及相关的不确定性）。评估针对需求的响应特定放大因子。FEMA建议的指南显示严重低估了轴承的位移，这是潜在的危险。通过在FEMA公式中建议修改因子来解决此不足。讨论了脉冲周期，质量比，轴承阻尼和危险等级对需求放大的影响。然而，