Energy absorption of reinforced concrete deep beams strengthened with CFRP sheet

Panjehpour, Mohammad; Ali, Abang Abdullah Abang; Aznieta, Farah Nora

doi:10.12989/scs.2014.16.5.481

Cited by 14 publications

(2 citation statements)

References 20 publications

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“…However, the maximum bond length and stress flow model still fail to receive enough recognition for pre/post-reinforced deep T-beams. In this context, the shear strengthening methodology [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] will be stressed for deep T-beams in the following sections.…”

Section: Introductionmentioning

confidence: 99%

Shear Strengthening of Deep T-Section RC Beams with CFRP Bars

et al. 2021

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Deep T-section beams have been widely used in engineering structures due to their high bearing capacity, high construction efficiency and economic benefits, while the current beam design theory can hardly interpret reasonably the mechanical behaviors of deep beams. The performance features of the deep T-beam were investigated, involving in strain distribution and principal stress trace using experimental tests. Different near surface mounted (NSM) reinforcement schemes were proposed for deep T-beams aiming at improving the shear capacity. The results show that the behaviors of deep T-beams dissatisfy the assumption of plane cross-section, and the ‘strut-and-tie’ model is applicable in such structures. The reinforcement systems can significantly relieve the strain concentration, mid-span deflection and crack width in deep T-beams, consequently improving the shear capacity range from 45 to 65%. The scheme is preferential for the reinforcement of deep T-beams when the applied angles, positions and lengths of CFRP bars are optimized based on the ‘strut-and-tie’ model.

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Section: Introductionmentioning

confidence: 99%

Shear Strengthening of Deep T-Section RC Beams with CFRP Bars

et al. 2021

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“…The latest research conducted on RC deep beam has investigated and compared the cracking moment and rupture modulus in deep beams [ 24 ]. The effect of carbon fiber-reinforced polymer (CFRP) strengthening on energy absorption of deep beam has been currently investigated [ 25 ]. Application of STM for CFRP strengthened deep beams has been also researched [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Refinement of Strut-and-Tie Model for Reinforced Concrete Deep Beams

Panjehpour

Chai

Voo³

2015

PLoS ONE

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Deep beams are commonly used in tall buildings, offshore structures, and foundations. According to many codes and standards, strut-and-tie model (STM) is recommended as a rational approach for deep beam analyses. This research focuses on the STM recommended by ACI 318-11 and AASHTO LRFD and uses experimental results to modify the strut effectiveness factor in STM for reinforced concrete (RC) deep beams. This study aims to refine STM through the strut effectiveness factor and increase result accuracy. Six RC deep beams with different shear span to effective-depth ratios (a/d) of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00 were experimentally tested under a four-point bending set-up. The ultimate shear strength of deep beams obtained from non-linear finite element modeling and STM recommended by ACI 318-11 as well as AASHTO LRFD (2012) were compared with the experimental results. An empirical equation was proposed to modify the principal tensile strain value in the bottle-shaped strut of deep beams. The equation of the strut effectiveness factor from AASHTTO LRFD was then modified through the aforementioned empirical equation. An investigation on the failure mode and crack propagation in RC deep beams subjected to load was also conducted.

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Characteristics of experimental ductility energy index of hybrid-CFRP reinforced concrete deep beams

Hason¹,

Hanoon

Saleem

et al. 2021

SN Appl. Sci.

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Although the ductility energy ratio ($$\mu_{E}$$ μ E ) of the reinforced concrete beam has been the topic of numerous study purposes and critical inquiry for the last decades, narrow consideration, especially in terms of reinforced concrete deep beams (RCDBs), is conducted to examine the ductility energy of hybrid-RC deep beams with various CFRP configurations. Growing the ductility of RCDB by CFRP reinforcement is significant in terms of shear resistance. Therefore, the objective herein is to explore the consequence of CFRP configurations (full side warped, 45° and 90° side stripes) on the ductility energy of RCDBs per two values of the shear span over depth proportion ($$a/d$$ a / d ) of 1.0 and 1.75, and shear reinforcement ratios ($$\rho_{v}$$ ρ v ) of 0.0% and 0.4%. The experimental testing program included 12 RCDBs, three ordinaries (unstrengthen), and nine retrofitted with several CFRP configurations. The results show that the CFRP strengthened beams is presented a higher degree of increase in terms of mid-span deflection with respect to conventional beams. The ductility energy index ($$\mu_{E}$$ μ E ) increases with the increase of the shear reinforcement ratio ($$\rho_{v}$$ ρ v ). The dissipated energy demonstrated by strengthening beam with CFRP is from 45 to 80%, and it was higher than those of reference RCDBs. The energy absorption of RCDBs is improved due to the attendance of CFRP configurations of about 15% and 51% for $$a/d$$ a / d proportion of 1.0 and 1.75, respectively, and for $$\rho_{v}$$ ρ v of 0% and 0.4% are about 15% and 86% consecutively.

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Energy absorption of reinforced concrete deep beams strengthened with CFRP sheet

Cited by 14 publications

References 20 publications

Shear Strengthening of Deep T-Section RC Beams with CFRP Bars

Shear Strengthening of Deep T-Section RC Beams with CFRP Bars

Refinement of Strut-and-Tie Model for Reinforced Concrete Deep Beams

Characteristics of experimental ductility energy index of hybrid-CFRP reinforced concrete deep beams

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