Uncertainty in the seismic performance of semi-active base isolation systems  

作　　者：Xiaoyue Wang Zhe Qu 

机构地区：[1]Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Hebei,065201,China

出　　处：《Earthquake Research Advances》2023年第2期62-70,共9页地震研究进展（英文）

基　　金：the Natural Science Foundation of China(grant number 52122811);the National Key Research and Development Program of China(grant number 2019YFE0112700).

摘　　要：In a conventional base isolation system,minimizing the seismic responses of the superstructure is always at the cost of increasing the isolator's response.The semi-active control of the isolator has been considered an effective solution to such a dilemma.It tunes the real-time properties of the isolator according to preset rules to further reduce the superstructure's seismic responses without increasing that of the isolator or vice versa.However,the number of ground motion records used to design and validate the controller,i.e.,the preset rules,in existing studies is usually very small and therefore is suspectable if it is adequate to address the significant uncertainty in the shaking of future earthquakes.This paper critically reviews the performance of the proportional-integralderivative(PID),linear-quadratic regulator(LQR),and fuzzy controllers in semi-active base isolation systems with magnetorheological(MR)dampers subjected to highly uncertain ground motion inputs through numerical simulations.The results show that the control performance of the controllers varies significantly with the increasing number of input records,suggesting the necessity of using at least 50 ground motion records to appropriately assess the performance uncertainty of semi-active base isolation systems.More importantly,the superior performance of the optimized controllers is not guaranteed if the system is subjected to ground motions that are new to the controller,even if the controller has been optimized for thousands of existing ground motions.It highlights the need of improving the adaptability of the semi-active systems for uncertain ground motion inputs.

关 键 词：Seismic isolation Semi-active control MR damper Control performance UNCERTAINTY 

分 类 号：TU435[建筑科学—岩土工程] TU352.12[建筑科学—土工工程]