Size Effect on Compressive Strength of GFRP-Confined Concrete Columns: Numerical Simulation
Publication: Journal of Composites for Construction
Volume 24, Issue 5
Abstract
The available researches on concrete columns confined with fiber-reinforced polymer (FRP) laminates have not comprehensively addressed the size effect. In this study, a three-dimensional mesoscale simulation approach that can consider concrete heterogeneities was established to explore the size effect of glass FRP (GFRP)-confined concrete columns under axial compression. The influence of constraint ratio and cross-sectional type on the failure of columns was investigated. In addition, the effect of lateral constraint on the nominal compressive strength and the corresponding size effect was quantitatively studied. The simulation results indicate that structural size has a significant influence on the nominal compressive strength of GFRP-confined concrete columns. For the present circular columns, size effect on nominal compressive strength is weakened or even suppressed as the FRP constraint ratio increases. For square columns, the presence of GFRP cannot suppress the size effect on compressive strength, since it cannot provide sufficient constraints. Furthermore, a size effect formula that can quantitatively describe the influence of lateral constraint on the size effect of GFRP-wrapped circular concrete columns was developed. Good agreement between the theoretical results and the simulation results as well as the available test results confirms the rationality of the developed size effect law (SEL).
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (No. 51822801) and the National Key Basic Research and Development Program of China (No. 2018YFC1504302). Their support is gratefully acknowledged.
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Journal of Composites for Construction
Volume 24 • Issue 5 • October 2020
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© 2020 American Society of Civil Engineers.
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Received: Mar 11, 2019
Accepted: Feb 11, 2020
Published online: Jun 17, 2020
Published in print: Oct 1, 2020
Discussion open until: Nov 17, 2020
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