Elliptical FRP–Concrete–Steel Double-Skin Tubular Columns: Axial Behavior, Interaction Mechanism, and Modeling
Publication: Journal of Composites for Construction
Volume 26, Issue 6
Abstract
The elliptical FRP–concrete–steel double-skin tubular column (DSTC) is a promising compression member due to its favorable mechanical performance and constructability. To provide insights into the interaction mechanism of the individual parts (i.e., elliptical FRP tube, elliptical steel tube, and sandwiched concrete), the compressive behavior of elliptical DSTC stub columns was systematically studied and compared with two types of reference specimens, including FRP-confined solid concrete (FCSC) and FRP-confined hollow concrete (FCHC) specimens. Based on a comparative investigation on the compressive performance and dilation properties of concrete cores in different column forms, a three-stage interaction mechanism in elliptical DSTC was clarified: unconfined stage, transition stage, and hardening stage. The confined concrete strength in elliptical DSTC increased by 20%–55% compared with the corresponding elliptical FCSC with the same column dimension and FRP confinement level. The possible reason is that the less-effective confinement zone in elliptical FCSC was replaced by a hollow steel tube. The existing model could not be directly adopted to predict the behavior of elliptical DSTC using high-strength concrete.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (51978126 and 51778102).
Notation
The following symbols are used in this paper:
- a
- half of major axis length of concrete;
- Ac
- cross-sectional area of concrete;
- as
- half of major axis length of steel tube;
- b
- half of minor axis length of concrete;
- bs
- half of minor axis length of steel tube;
- Ef
- elastic modulus of FRP;
- compressive strength of confined concrete;
- compressive strength of unconfined concrete;
- kɛ
- FRP efficiency factor;
- Nco
- axial resistance of unconfined concrete;
- Ns
- axial resistance of hollow steel tube;
- Nu
- axial resistance of DSTC column;
- tf
- nominal thickness of FRP;
- ts
- thickness of steel tube;
- ɛco
- axial strain at the peak stress of unconfined concrete;
- ɛcu
- ultimate axial strain of confined concrete;
- ɛf
- ultimate tensile strain of FRP;
- ɛh,max
- maximum hoop strain of FRP;
- ɛh,rup
- hoop rupture strain of FRP;
- ρf
- FRP volumetric ratio;
- ρk
- confinement stiffness ratio; and
- ϕa
- void area ratio.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 6 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Feb 15, 2022
Accepted: Jul 24, 2022
Published online: Oct 10, 2022
Published in print: Dec 1, 2022
Discussion open until: Mar 10, 2023
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