Polynomial friction pendulum isolators (PFPIs) for building floor isolation: An experimental and theoretical study
Polynomial friction pendulum isolators (PFPIs) for building floor isolation: An experimental and theoretical study
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DOI：
10.1016/j.engstruct.2013.06.016
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发表时间：
2013-11
影响因子：
5.5
通讯作者：
L. Lu;Tzu-Ying Lee;Shiang-Yu Juang;S. Yeh
中科院分区：
文献类型：
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作者：
L. Lu;Tzu-Ying Lee;Shiang-Yu Juang;S. Yeh
与结构基础隔震相比，楼层隔震是一种更经济有效的建筑结构中振动敏感设备的抗震保护手段。在这项研究中，一个多功能的地板隔震系统（FIS），由几个可变刚度的滑动隔震器，称为多项式摩擦摆隔震器（PFPI），提出了实验和数值研究。由于其可变刚度的性质，建议PFPI-FIS是能够实现多个设计目标。本文还演示了设计一个原型PFPI-FIS，满足所需的双重性能目标的两个级别的地震荷载的程序。振动台试验结果表明，该结构具有理想的变刚度滞回特性，实测响应与仿真响应吻合较好。此外，通过考虑10个地震动，代表不同的频谱内容的地震，原型PFPI-FIS在这些不同强度水平的地震动下的地震反应进行了广泛的模拟。仿真结果表明，PFPI-FIS的隔震性能符合指定的双重性能目标，即根据地震烈度和隔震器漂移产生加速度或位移控制。
Compared to structural base isolation, floor isolation is a more cost-effective and efficient means for seismic protection of vibration-sensitive equipment in a building structure. In this study, a multi-functional floor isolation system (FIS) that consists of several variable-stiffness sliding isolators, called polynomial friction pendulum isolators (PFPIs), is proposed and studied experimentally and numerically. Due to its variable-stiffness nature, the proposed PFPI-FIS is able to achieve multiple design objectives. This paper also demonstrates the procedure to design a prototype PFPI-FIS which meets the desired dual performance objectives for two-level seismic loads. The shaking table tests verify that the prototype system possesses the desired hysteretic property with variable stiffness, and the measured responses match very well with the simulated ones. Moreover, by considering ten ground motions that represent earthquakes with different spectral contents, the seismic responses of the prototype PFPI-FIS under these ground motions with different intensity level are simulated extensively. The simulated results demonstrate that the isolation performance of the PFPI-FIS does comply with the designated dual performance objectives, which yield either acceleration or displacement control depending on the earthquake intensity and isolator drift.