Numerical Study of Flexural Behavior of Post-Tensioned Concrete-Filled Fiber-Reinforced Polymer Tube Beam
Publication: Practice Periodical on Structural Design and Construction
Volume 29, Issue 4
Abstract
Concrete-filled fiber tubes (CFFT) are gaining prominence as a feasible alternative to traditional materials for a variety of structural applications. However, research on structural performance of CFFT beams is still scarce. This paper presents a finite-element (FE) analysis of CFFT beams validated by experimental results from literature. Then, a parametric study investigating structural performance of post-tensioned (PT CFFT) beams was conducted using 34 FE models using ANSYS nonlinear FE software program. The parametric study results showed that both normal-strength concrete (NSC) and high-strength concrete (HSC) filled PT CFFT exhibit identical nonlinear responses. Increasing the prestressed and non-prestressed reinforcement ratio significantly improved the overall performance of PT CFFT beams. Placing the PT tendons at the bottom of PT CFFT beams enhanced the cracking, yielding, and ultimate load-carrying capacities by 7.98%, 12.32%, and 9.03% for NSC-filled PT CFFT beams, respectively. Doubling the axial stiffness of the tube laminate structure increased the ultimate load, energy absorption capacity (EAC), pre-yielding stiffness (), and post-yielding stiffness () by 18.5%, 12.15%, 9.21%, and 8.2%, respectively for NSC-filled PT CFFT beams. Beams with straight PT tendons exhibited increased cracking, yielding, and ultimate load capacity by 10.85%, 14.60%, and 13.58% more than those with curved-profile tendons. The ductility of PT CFFT beams is more sensitive to the amount of prestressed reinforcement ratio and concrete strength has a minimal effect on the structural performance of PT CFFT beams.
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Data Availability Statement
All necessary data are included in the published article.
Acknowledgments
The authors extend their heartfelt gratitude to Addis Ababa Science and Technology University (AASTU) for their invaluable support throughout this endeavor.
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Published In
Practice Periodical on Structural Design and Construction
Volume 29 • Issue 4 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 28, 2023
Accepted: Mar 19, 2024
Published online: Jun 28, 2024
Published in print: Nov 1, 2024
Discussion open until: Nov 28, 2024
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