Numerical Study of Flexural Behavior of Post-Tensioned Concrete-Filled Fiber-Reinforced Polymer Tube Beam

Numerical Study of Flexural Behavior of Post-Tensioned Concrete-Filled Fiber-Reinforced Polymer Tube Beam

AbstractConcrete-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 v...

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Bibliographic Details
Published in:Practice periodical on structural design and construction Vol. 29; no. 4
Main Authors: Radie, Edoniyas Birhanu, Urgessa, Girum, Mohammed, Tesfaye Alemu
Format: Journal Article
Language:English
Published: New York American Society of Civil Engineers 01-11-2024
Subjects:
Concrete
Concrete properties
Curved beams
Energy absorption
Fiber reinforced concretes
Fiber reinforced polymers
High strength concretes
Nonlinear response
Post-tensioned concrete
Post-tensioning
Software
Stiffness
Technical Papers
Tendons
Tubes
Ultimate loads
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Summary:AbstractConcrete-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 (Kpre), and post-yielding stiffness (Kpos) 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.
ISSN:1084-0680
1943-5576
DOI:10.1061/PPSCFX.SCENG-1475