The sliding isolation technology has been widely recognized as an efficient seismic protection method for either new buildings or retrofitted buildings. In recent years, the application and research on sliding isolators have grown dramatically. However, the design method for advanced sliding isolators, as the fundamental of the sliding isolator application, has not been discussed nor developed en masse. Therefore, this study proposes a performance-based design method for the polynomial friction pendulum isolator (PFPI), which is one of the most advanced adaptive sliding isolators. The proposed design method is able to accommodate pre-selected multiple seismic performance objectives that are corresponding to multi-levels of seismic forces. In this study, two types of PFPIs are generated by the proposed design method: 1) PFPI with softening-hardening behavior (PFPI-SH), 2) PFPI with hardening-hardening behavior (PFPI-HH). The two designed PFPIs are further implemented on a designated structure, and then the seismic performances of the structure isolated by the PFPI-SH and PFPI-HH are assessed and compared with the same structure isolated by conventional sliding isolator, i.e., friction pendulum system (FPS) isolator. The employed assessment methods include the incremental intensity-based and probability-based assessment. To verify feasibility of the proposed design, the PFPIs were analyzed under the DBE and MCE level ground motions. The analysis results show that PFPI-SH and PFPI-HH are able to satisfy the prescribed multiple objectives under both the DBE and MCE. In the probability-based assessment, as compared to the FPS isolator, the PFPI-SH shows better performance in reducing the isolator displacement by having a failure probability about 20% lower than that of the FPS isolator, while the performance of the PFPI-HH is close to that of the FPS. The structures with the three types of the isolators bear the similar failure probability in small to medium earthquakes, when the superstructure and isolation layer were simultaneously examined, while in large earthquake intensity, the failure probability of the whole isolated structure will be dominated by the isolator performance.

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