Effect of elevated temperatures on axial compressive performance of concrete⁃filled GFRP tube columns

doi:10.19491/j.issn.1001-9278.2025.07.010

Abstract

Abstract:

This study examined the effects of elevated temperatures （20⁃220°C） on the axial compressive behavior of concrete⁃filled glass fiber reinforced polymer （GFRP） tubular columns. Experimental investigations were conducted on GFRP tubes， concrete cubes， and composite columns with two different specifications， subjected to heating durations of 2 and 4 hours. The study evaluated circumferential tensile properties of GFRP tubes， compressive strength of concrete， and their combined influence on column performance. Results indicated that at ambient temperature， GFRP confinement enhanced the ultimate bearing capacity of concrete columns by 4.75 times compared to unconfined specimens. However， elevated temperatures significantly degraded the mechanical compatibility between GFRP tubes and concrete， leading to progressive reductions in both ultimate bearing capacity and strain. At 220 ℃， the bearing capacity decreased by 18.73 % （2⁃hour exposure） and 20.21 % （4⁃hour exposure）. Temperature elevation proved more detrimental to axial performance than exposure duration， highlighting the importance of thermal considerations in GFRP⁃confined concrete column design.

Key words: concrete?filled GFRP tube column, elevated temperature, axial compressive performance, ultimate compressive capacity, confinement effect

CLC Number:

TQ327.1

GAO Yonghong, HE Jiale, JIN Qingping. Effect of elevated temperatures on axial compressive performance of concrete⁃filled GFRP tube columns[J]. China Plastics, 2025, 39(7): 56-62.

Figures/Tables 14

Fig.1. Shape and size of the specimen

Fig.2. GFRP tube separation disc loading specimen and equipment

Fig.3. GFRP tube axial compression specimen

Fig.4. Load test schematics and devices

Fig.5. Comparison of the appearance of CFGFT column after elevated temperatures

Fig.6. Damage pattern of CFGFT column after elevated temperatures

Fig.7. GFRP tube circumferential tensile strength

Fig.8. GFRP tube axial compressive strength

Fig.9. Tensile stress⁃strain curves of GFRP tube

Fig.10. Axial compressive stress⁃strain curves of GFRP tube

Fig.11. Compressive strength of concrete

Fig.12. Mean values of ultimate bearing capacity of specimens

Fig.13. Load⁃strain curves of CFGFT columns at different heating temperatures

Fig.14. Load⁃limit strain averages

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