An experimental study on axial behavior of CFRP-strengthened RC rectangular columns with variable slenderness ratio
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ORIGINAL PAPER
An experimental study on axial behavior of CFRP‑strengthened RC rectangular columns with variable slenderness ratio Giridhar N. Narule1 · Abhay N. Bambole2 Received: 22 October 2019 / Accepted: 8 October 2020 © Springer Nature Switzerland AG 2020
Abstract In the construction industry, carbon fiber-reinforced polymer (CFRP) composites are widely used for retrofitting and rehabilitation of reinforced concrete (RC) rectangular columns to enrich the service life of structures. The CFRP-confined RC rectangular column with a variable slenderness ratio has limited design provisions in available design codes. The aim of the current experimental work is to explore the efficacy of slenderness ratio on the axial performance of CFRP compositeconfined rectangular columns having a constant cross-sectional area and steel reinforcement ratio. The experimental results clearly demonstrated that the yield strength, ultimate strength, and ductility of the RC column after CFRP confinement are significantly influenced by the variation in the slenderness ratio. The response of CFRP wrap, transverse and longitudinal reinforcements in the strengthening process of the RC rectangular column also remarkably varied for different slenderness ratios. Keywords Carbon fiber-reinforced polymer · Rectangular columns · Slenderness ratio · Axial behavior
Introduction The enhancement of ductility and strength due to the active lateral confinement is important in the case of CFRP-strengthened RC rectangular columns with a lower slenderness ratio. Although the CFRP confinement as a strengthening practice is very operative for short columns, designers are still tackling complications for the confining of RC rectangular columns with variable slenderness ratio due to the limited research and the absence of complete guiding principle and design code requirements. The effectiveness of slenderness ratio on the response of reinforced concrete columns with FRP wrap at yield and ultimate level were studied. Mirmiran et al. (2001) conducted tests on concrete-filled fiber-reinforced polymer tubes having slenderness ratios of 4, 11, 18, 22, 30, 34, and 36 and detected a considerable decrease in the load sustainability * Giridhar N. Narule [email protected] 1
Department of Civil Engineering, Vidya Pratishthans Kamalnayan Bajaj Institute of Engineering and Technology, Baramati, Pune 413 133, India
Department of Structural Engineering, Veermata Jijabai Technological Institute, Matunga, Mumbai 400 019, India
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of column with a rise in the proportion of slenderness. The CFFT columns were extra delicate to slenderness effectiveness due to lower stiffness and higher strength of used GFRP (Glass FRP) materials when compared to steel. Etman et al. (2002) studied the effects of strengthening of RC circular columns of 150-mm diameter as well as square columns of 150-mm side length with different slenderness ratios using CFRP wraps. They concluded that the increase in ductility due to wrapping with FRP fabric is more distinctive and higher with t
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