Seismic Behavior and Design of Concrete-Filled Thin-Walled Steel Tube Column-to-Foundation Connections
Publication: Journal of Structural Engineering
Volume 147, Issue 6
Abstract
Thin-walled steel tubes are highly recommended to be used in concrete-filled steel tube (CFST) columns due to their economic benefits. However, the inherent difficulty of connections between the steel tube and foundation limits the application of thin-walled CFSTs. Four types of CFST column-to-foundation connections employing anchor bars to resist the bending moment are proposed, avoiding the insertion of the steel tube into the foundation. In this paper, the design method for the proposed column-to-foundation connections was first studied. Eight column-to-foundation connections for thin-walled CFST columns were tested under combined constant axial load and cyclic lateral load. The observed failure modes, load-displacement hysteresis curves, load-displacement skeleton curves, circumferential stiffness, energy-dissipation coefficient, and load-strain curves of steel tube were analyzed and presented. The experimental results and theoretical analyses indicated that properly designed connections possessed higher bending strength and better ductility than traditional embedded connections.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the financial support provided by the Scientific and Technological Innovation Foundation of Chongqing (CSTC2019YSZX-JSCXX0001) and the National Natural Science Foundation of China (51890902).
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 147 • Issue 6 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 23, 2019
Accepted: Feb 4, 2021
Published online: Apr 9, 2021
Published in print: Jun 1, 2021
Discussion open until: Sep 9, 2021
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