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Trial investigates load capacity improvements in CFST arches using GFRP strength enhancement, suggesting effective construction methods.
To address a knowledge gap regarding the strengthening effects of different glass - fiber reinforced polymers (GFRP) wrapping methods on concrete - filled steel tube (CFST) arches, this study investigates the effects of GFRP on the in-plane load capacity of concrete-filled steel tube arches by five-point loading tests on arch rib specimens and corresponding finite element simulations. A total of one bare CFST arch and five GFRP-strengthened CFST arches were designed and tested under in-plane five-point loading. Moreover, the failure modes, load-deflection curves, and the effects of key parameters on load-bearing capacity were analyzed. The specific effects of concrete strength, steel’s yield strength, GFRP thickness, wrapping angles, and wrapping span on the ultimate load capacity of the structure were deeply analyzed through parametric study. The results reveal that wrapping GFRP significantly improves the load-bearing performance of CFST arches, and the bidirectional wrapping demonstrated the most substantial improvement, resulting in a 19% enhancement in loading capacity.
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Huang et al. (2026) studied this question.
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