In areas of civil engineering, the resilient friction base isolator (R-FBI) system has been used due to its enhanced isolation performance under seismic excitations. However, because nonlinear behavior of the R-FBI should be reflected in seismic design, effective stiffness (K_eff) of the R-FBI is uniformly applied at both peak ground acceleration (PGA) of 0.08 g and 0.154 g which use a multimodal response spectrum (RS) method analysis. For rational seismic design of bridges, it should be required to evaluate the dynamics of the R-FBI from in-field tests and to improve the seismic design procedure based on the performance level of the bridges. The objective of this study is to evaluate the dynamics of the R-FBI and to suggest the performance-based seismic design method for cable-supported bridges with the R-FBI. From the comparison between the experiments’ results and modal shape analyses, the modal shape analyses using primary (K_u) or infinite stiffness (fixed end) showed a great agreement with the experimental results compared to the application of K_eff in the shape analysis. Additionally, the RS or nonlinear time history method analyses by the PGA levels should be applied by reflecting the dynamic characteristics of the R-FBI for the reasonable and efficient seismic design.

中文翻译：

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弹性摩擦基础隔震系统对基于斜拉桥的基于性能的抗震设计方法的改进

在土木工程领域，已使用弹性摩擦基础隔离器（R-FBI）系统，因为它在地震激励下具有增强的隔离性能。但是，由于应在抗震设计中反映R-FBI的非线性行为，因此有效刚度（K _eff使用多峰响应谱（RS）方法分析，在0.08 g和0.154 g的峰值地面加速度（PGA）上均匀施加R-FBI的）。为了进行合理的桥梁抗震设计，应通过现场测试评估R-FBI的动力，并根据桥梁的性能水平改进抗震设计程序。这项研究的目的是评估R-FBI的动力，并提出基于性能的抗震设计方法，用于带有R-FBI的索桥。从实验结果与模态形状分析之间的比较来看，与使用K _eff的应用相比，使用主刚度（K _u）或无限刚度（固定端）的模态形状分析与实验结果非常吻合在形状分析中。此外，应通过反映R-FBI的动态特性来应用PGA级别的RS或非线性时程分析方法，以进行合理，有效的地震设计。