Seismic Performance of Concrete-Encased CFST Piers: Analysis
Publication: Journal of Bridge Engineering
Volume 23, Issue 1
Abstract
The analytical behavior of concrete-encased concrete-filled steel tubular (CFST) piers under cyclic lateral loading is reported in this paper. A finite-element analysis (FEA) model is developed to investigate the cyclic behavior of such composite piers. Comparisons are made between measured and predicted results on failure modes and load versus displacement relationships. It is found that the proposed FEA model can reproduce the experimental results with reasonable accuracy. Full-range load-displacement relationships, contact stresses between the steel tube and concrete, contact stresses between the restricted region and the outer concrete, and comparisons on different members are analyzed using the verified FEA model. Parametric analysis is conducted to investigate the influence of various parameters on load-displacement (P-Δ) envelope curves. The parameters include the material strength, the steel ratio of inner CFST, the wall thickness to sectional width ratio, the longitudinal reinforcement ratio, and the axial load level. Finally, a simplified hysteretic model for the P-Δ relationship of a concrete-encased CFST pier is proposed.
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Acknowledgments
The research reported in this paper is part of the Project 51378290 supported by the National Natural Science Foundation of China (NSFC). The financial support is highly appreciated.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 1 • January 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Oct 16, 2016
Accepted: Jul 12, 2017
Published online: Nov 1, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 1, 2018
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