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Creep parameters of GFRP reinforced concrete beams
Glass Fiber Reinforced Polymer (GFRP) reinforcement is currently used instead of traditional steel reinforcement in concrete structures. At the same time, rheological properties of GFRP reinforcement, which also determine service life, reliability, and sustainability of structure, are studied insufficiently. Creep rupture factor for GFRP rods prescribed by current design guidelines is rather conservative. Besides rather strict requirements for achievement of serviceability limit state mentioned documents put additional limits on calculation for long-term load. Taken factors significantly decrease design values of reinforcement characteristics. The purpose of this article is to investigate the stress strain state of concrete beams reinforced with GFRP during long-term four-point bending. Article describes methods and results of experimental research for strain and deflection growth in time, crack formation and residual strength of beams designed to achieve flexural behavior. 6 beams (3 series) with GFRP 6 and 14 mm in diameter were exposed under constant loads for 175-200 days. After exposure for 175-200 days all beams were tested by short-term four-point load to achieve flexural failure in cross section. Result of this work, presented in tables and figures, describes creep parameters (ratio of creep deflection) of the concrete beams reinforced with GFRP. Deflection of a beam considering the creep was obtained based on test results.
Creep parameters of GFRP reinforced concrete beams
Glass Fiber Reinforced Polymer (GFRP) reinforcement is currently used instead of traditional steel reinforcement in concrete structures. At the same time, rheological properties of GFRP reinforcement, which also determine service life, reliability, and sustainability of structure, are studied insufficiently. Creep rupture factor for GFRP rods prescribed by current design guidelines is rather conservative. Besides rather strict requirements for achievement of serviceability limit state mentioned documents put additional limits on calculation for long-term load. Taken factors significantly decrease design values of reinforcement characteristics. The purpose of this article is to investigate the stress strain state of concrete beams reinforced with GFRP during long-term four-point bending. Article describes methods and results of experimental research for strain and deflection growth in time, crack formation and residual strength of beams designed to achieve flexural behavior. 6 beams (3 series) with GFRP 6 and 14 mm in diameter were exposed under constant loads for 175-200 days. After exposure for 175-200 days all beams were tested by short-term four-point load to achieve flexural failure in cross section. Result of this work, presented in tables and figures, describes creep parameters (ratio of creep deflection) of the concrete beams reinforced with GFRP. Deflection of a beam considering the creep was obtained based on test results.
Creep parameters of GFRP reinforced concrete beams
Kaksuha, Vladimir (author) / Gorbunov, Igor (author) / Akimov, Pavel (editor) / Tusnin, Alexander (editor) / Vatin, Nikolai (editor) / Doroshenko, Anna (editor)
CONSTRUCTION: THE FORMATION OF LIVING ENVIRONMENT: FORM-2022 ; 2022 ; Moscow, Russian Federation
AIP Conference Proceedings ; 2791
2023-08-02
8 pages
Conference paper
Electronic Resource
English
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