Effects of inherent characteristics of both isolation system (IS) and superstructure on seismic performances of aseismically base-isolated buildings subjected to near- and far-field ground motions are investigated through extensive numerical analyses. ISs considered are friction pendulum system (FPS) and high-damping laminated rubber bearing (HRB), as the most practical ISs. Superstructures are 3-, 7-, and 11-story buildings with steel and reinforced concrete moment-resisting and braced frames. Seven isolation strategies are practically designed by the ISs, using three target displacements and two coefficients of friction. Eighty-four structural models are created for the 12 superstructures isolated by the two ISs. 1176 nonlinear time history analyses are carried out on the two-dimensional models of the isolated buildings subjected to seven near-field and seven far-field ground motions. Base shears, story displacements, and story accelerations are studied as the performance criteria. It is shown that the effectiveness of aseismic base isolation depends significantly on inherent mass, stiffness, and damping of the structure. The effect of isolation damping is more than mass and stiffness of the superstructure. The effectiveness of aseismic base isolation with the design strategies controlled by target displacement increases by increase in the inherent mass and stiffness of the superstructure, while facing reduction due to inherent increase in the isolation damping. The effects are similar in near- and far-field ground motions. Seismic performances of FPS are less sensitive to the effects of inherent structural characteristics. With the conditions and parameters set in this study, it is found that FPS performs better than HRB, specifically in near-field excitations.

中文翻译：

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固有结构特征对抗震隔震建筑抗震性能的影响

通过广泛的数值分析，研究了隔震系统 (IS) 和上部结构的固有特性对承受近场和远场地震动的抗震基础隔震建筑物的抗震性能的影响。考虑的 IS 是摩擦摆系统 (FPS) 和高阻尼层压橡胶轴承 (HRB)，作为最实用的 IS。上层建筑是 3 层、7 层和 11 层的建筑，采用钢和钢筋混凝土抗弯和支撑框架。IS 实际上设计了七种隔离策略，使用三个目标位移和两个摩擦系数。为由两个 IS 隔离的 12 个上层建筑创建了 84 个结构模型。对受7次近场和7次远场地震动作用的孤立建筑物二维模型进行了1176次非线性时程分析。基础剪力、楼层位移和楼层加速度被作为性能标准进行研究。结果表明，抗震基础隔离的有效性在很大程度上取决于结构的固有质量、刚度和阻尼。隔离阻尼的影响不仅仅是上部结构的质量和刚度。由目标位移控制的设计策略的抗震基础隔离的有效性随着上部结构的固有质量和刚度的增加而增加，同时由于隔离阻尼的固有增加而面临降低。近场和远场地面运动的效果相似。FPS 的抗震性能对固有结构特征的影响不太敏感。根据本研究中设置的条件和参数，发现 FPS 的性能优于 HRB，特别是在近场激发中。