Control of Secondary Systems Response in a Base-Isolated Building under Tridirectional Ground Motion
Publication: Practice Periodical on Structural Design and Construction
Volume 27, Issue 1
Abstract
The studies on the seismic control of a secondary system (S-system) in the base-isolated primary system under multicomponent earthquake is scanty. In this study, an S-system response mounted on a floor of a three-dimensional (3D) base-isolated building is investigated under three component earthquake. The main objective of the study is to examine the response reductions of the S-system in all three directions, including the vertical direction, in which the building is not isolated. For the purpose of the study, two 6-story 3D building models, one base isolated and the other nonisolated, are analyzed. The S-system consists of a single portal frame with a mass at its center. The nonlinear time history analysis of both building models is carried out for three component ground motion, using commercial software SAP 2000, in order to study the control of response of the S-system. The nature, peak ground acceleration (PGA), and component ratios of the earthquake are varied to perform the parametric study. The findings of the study show that significant reduction in the lateral displacement and acceleration of the S-system is achieved by base isolating the building. In addition, the S-system’s vertical responses are reduced despite the isolation being ineffective in the vertical direction.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Practice Periodical on Structural Design and Construction
Volume 27 • Issue 1 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 10, 2021
Accepted: Aug 11, 2021
Published online: Sep 30, 2021
Published in print: Feb 1, 2022
Discussion open until: Feb 28, 2022
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