Static Test and Seismic Dynamic Response of an Innovative 3D Seismic Isolation System
Publication: Journal of Structural Engineering
Volume 144, Issue 12
Abstract
Seismic isolation is an efficient strategy to protect structures from the effects of moderate to severe earthquake shaking. Conventional isolation devices can reduce the structural response in horizontal directions only; however, three-dimensional (3D) ground motions have been observed in earthquake records. In this paper, an innovative 3D seismic isolator is proposed. A new kind of asymmetric oblique hysteretic model is illustrated, and a quasistatic compression test of a model device using three lead rubber bearings (LRBs) is conducted. The test results and theoretical model results match well. A significant asymmetric property is observed in the hysteretic curves. The proposed hysteretic model can efficiently simulate the vertical mechanical behavior of a 3D seismic isolation system. The effects of different parameters are highlighted based on the theoretical mechanical model. The inclination angle, friction coefficient, and second shape factor of the inclined LRBs strongly influence the vertical behavior of the proposed device. A dynamic response analysis of the substructure of a nuclear power plant (NPP) is conducted. The hysteretic curves have the shape of an asymmetric quadrangle; this shape is similar to that observed in the test results. The vertical acceleration response of the vertical isolation structure is reduced by 33% compared with that of a fixed-base structure and reduced by 58% compared with that of a horizontal isolation structure. The proposed 3D isolator can sufficiently isolate the seismic input.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51478257), Natural Science Foundation of Shanghai (Grant No. 15ZR1416200), and Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20133108110024). The authors also want to acknowledge the Shanghai Nuclear Engineering Research & Design Institute Co., Ltd. for providing the ground motions used in this project.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Nov 30, 2016
Accepted: May 8, 2018
Published online: Sep 19, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 19, 2019
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