Experimental investigation on the axial compressive behavior of GFRP-pipe-encased concrete columns with spiral reinforcement

doi:10.19936/j.cnki.2096-8000.20250628.001

Abstract

Abstract: This study aims to the axial compression performance of GFRP pipe spiral reinforcement composite confined concrete columns. A total of 29 specimens were fabricated and subjected to axial compression tests, with variations in concrete strength, yield strength of spiral reinforcement, stirrup ratio of spiral reinforcement, and longitudinal reinforcement ratio as parameters. The failure process of the specimens was observed, and the failure modes of different specimens were summarized. The load-displacement and load-strain curves were obtained. The influence of various parameters on the axial compression performance of specimens was investigated. The test results indicate that specimens fail due to the fracture of the GFRP tube, the crushing of the core concrete, or the breakage of the spiral reinforcement. Ultimate load-bearing capacity of GFRP tube spiral reinforced concrete columns increases with rising concrete strength, while their deformability diminishes. With increasing yield strength and stirrup ratio of spiral reinforcement, both the ultimate load-bearing capacity and shape-shifting capability of GFRP-pipe spiral reinforced concrete columns enhance. The longitudinal reinforcement ratio has minimal influence on these columns. GFRP pipe can enhance the axial compression peak stress of reinforced concrete columns by over 30%, and increase the ductility coefficient by over 90%. The addition of spiral reinforcement can increase the axial compressive peak stress of GFRP-pipe concrete columns by over 10%, and enhance its ductility by over 20%. Finally, a formula for calculating the axial compression bearing capacity of GFRP-pipe spiral reinforced composite confined concrete columns is proposed, and the calculated results closely align with the experimental findings.

Key words: GFRP tube, spiral reinforcement, confined concrete, high strength steel wire, bearing capacity

CLC Number:

TB332

JING Chenggui, WU Tong, ZHAO Lin, CHEN Zongping. Experimental investigation on the axial compressive behavior of GFRP-pipe-encased concrete columns with spiral reinforcement[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(6): 1-9.

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