Bidirectional Cyclic Loading Performance of a Prefabricated Self-Centering Metallic-Damped Steel Column Base
Publication: Journal of Structural Engineering
Volume 150, Issue 10
Abstract
A prefabricated seismic-resilient steel column base capable of accommodating bidirectional loading, enabling fast onsite construction and causing minimal disturbance to building function, is proposed. The column base consists of a lower circular column segment embedded in foundation, an upper box column segment placed above ground floor, four buckling-restrained steel plates (BRPs) as energy-dissipating devices to connect the column segments, and a pretensioned high-strength steel rod anchored between the column segments to secure self-centering. The upper column segment is supported on the lower one via a pair of circular base plates with protruded fillet edges to allow upper column rocking in any direction, and they are pretensioned in shop as a prefabricated column to expedite onsite construction. Theoretical models of the proposed column base under unidirectional and bidirectional seismic loading are developed, and design criteria for different seismic intensity levels are presented. A cyclic test program of a full-scale column specimen with the proposed configuration subjected to one unidirectional and three bidirectional loading phases is introduced. Global and local responses of the specimen are discussed, and test results confirmed effectiveness of the column base providing sufficient rigidity under service level earthquakes, repeatable hysteresis under bidirectional loading, avoiding rupture of the BRPs under series of strong earthquakes, and achieving self-centering, low-damage, and rapid postearthquake recovery. The theoretical models and design criteria to achieve the expected performance under bidirectional loading are validated.
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Data Availability Statement
Data will be made available on reasonable request.
Acknowledgments
Financial support by the National Natural Science Foundation of China (Grant Nos. 52178481, 52308503, and 51778244), Guangdong Basic and Applied Basic Research Foundation (Grant Nos. 2023B1515040012 and 2021B1515020057), and Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology (Grant No. 2021B1212040003) is greatly acknowledged.
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Published In
Journal of Structural Engineering
Volume 150 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jan 3, 2024
Accepted: Apr 24, 2024
Published online: Aug 2, 2024
Published in print: Oct 1, 2024
Discussion open until: Jan 2, 2025
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