Durability Assessment of Hybrid Double-Skin Tubular Columns under Wet–Dry Cyclic Environments
Publication: Journal of Composites for Construction
Volume 28, Issue 5
Abstract
Hybrid fiber-reinforced polymer (FRP)–concrete–steel hybrid double-skin tubular columns (DSTCs) consist of an outer FRP tube, an inner steel tube, and a layer of concrete filled between the two tubes. Previous studies have demonstrated their structural performance compared with conventional concrete columns. However, their durability performance, particularly in aggressive environments, is not well understood. Therefore, this study aims to investigate the durability of hybrid DSTCs subjected to a wet–dry cyclic environment for up to 2 years. The time-dependent behaviors, including axial load–strain (axial and hoop) curves, ultimate load, and ultimate axial and hoop strains, are tested and discussed with regard to the aging time. The test results indicate that the ultimate load of hybrid DSTCs with a 6-mm glass fiber–reinforced polymer (GFRP) tube continuously increased by 15.1% after 2 years of exposure primarily owing to the increase in concrete strength. By contrast, the ultimate load of hybrid DSTCs with a 3-mm GFRP tube increased by 15.2% after 1 year of exposure and increased by 11.6% after 2 years of exposure. The results indicate that the reductions can be attributed to the degradation of the GFRP tubes, especially for a thinner GFRP tube. In addition, a design-oriented stress–strain model for concrete in DSTCs is verified against the test results.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published article.
Acknowledgments
The authors acknowledge the financial support received from the National Natural Science Foundation of China (52178277) and the Natural Science Foundation of Guangdong Province (No. 2021B1515020029).
Notation
The following symbols are used in this paper:
- Ac
- cross-sectional area of concrete;
- E2
- slope of the linear second portion of a stress–strain curve;
- Ec
- modulus of elasticity of unconfined concrete;
- Efrp
- modulus of elasticity of the GFRP tube;
- Esec
- secant modulus of unconfined concrete;
- compressive strength of unconfined concrete;
- compressive strength of confined concrete;
- PG
- load carried by the GFRP tube;
- Ps
- load carried by the steel tube;
- Pt
- load carried by the hybrid DSTC;
- R
- radius of the confined concrete;
- tfrp
- thickness of the GFRP tube;
- axial strain of the confined concrete;
- ultimate axial strain of the confined concrete;
- hoop rupture strain of the GFRP tube;
- axial strain at transition point (transition strain);
- strength enhancement ratio;
- ρk
- FRP confinement stiffness ratio;
- FRP rupture strain ratio;
- σc
- axial stress of confined concrete; and
- φ
- void ratio of a hybrid DSTC.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 28 • Issue 5 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 23, 2023
Accepted: May 8, 2024
Published online: Jul 8, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 8, 2024
ASCE Technical Topics:
- Axial loads
- Composite materials
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fiber reinforced composites
- Fiber reinforced polymer
- Fibers
- Glass fibers
- Hybrid methods
- Load tests
- Materials engineering
- Methodology (by type)
- Polymer
- Static loads
- Statics (mechanics)
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
- Synthetic materials
- Tests (by type)
- Tubes (structure)
- Ultimate loads
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