Assessment of shear strength of reinforced concrete beams without shear reinforcement: A comparative study between codes of practice and artificial neural network

Jayasinghe, Thushara; Gunawardena, Tharaka; Mendis, Priyan

doi:10.1016/j.cscm.2022.e01102

Cited by 14 publications

(7 citation statements)

References 22 publications

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“…The shear resistance computed using ACI 318-19 [42] matched best with experimental V c of OPC beams. In the available literature, the studies reported that V c computed using ACI 318- 19 [42] was closer to the experimental shear resistance of OPC beams having a/d ratios between 2.4 and 8.1 [59,60].…”

Section: Opc Beamsmentioning

confidence: 78%

Shear Behavior of Geopolymer Concrete Slender Beams

et al. 2023

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This study investigates the shear behavior of slender steel-reinforced geopolymer concrete (GPC) beams with the shear span to effective depth ratio (a/d) of 4.5 and 5.0. To investigate the effect of shear reinforcement, two ordinary Portland cement concrete (OPC) beams and two GPC beams without shear reinforcement, and two OPC beams and two GPC beams reinforced with shear stirrups were cast. All beams were 150 mm wide and 225 mm deep with lengths of 1770 mm (a/d=4.5) and 1950 mm (a/d=5). The beams were tested under a three-point bending test. The experimental results showed that OPC and GPC beams without and with shear reinforcements exhibited similar crack propagation and failure mechanism. The midspan deflections of GPC beams were greater than OPC beams. The normalized shear resistance of OPC and GPC beams with a/d ratio 4.5 was greater than 4% and 30%, respectively, than beams with a/d ratio 5. OPC beams showed a greater decrease in shear resistance with an increasing a/d ratio compared to GPC beams. The shear resistances computed using empirical relationships available in various OPC design codes including AC1-318-14, AC1-318-19, fib-10 and JSCE-07 underestimated the experimental shear resistance of both OPC and GPC beams. In addition, the environmental assessment of OPC and GPC beams exhibited that GPC beams emit about 34% lower embodied CO2 emissions than OPC beams.

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Section: Opc Beamsmentioning

confidence: 78%

Shear Behavior of Geopolymer Concrete Slender Beams

et al. 2023

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“…This is because the shear strength equation used in ACI-318-19 [40] considers the size effect and influence of the flexural reinforcement ratio. Jayasinghe et al [73] and Aguilar et al [74] also reported that ACI-318-19 [40] predicts the shear strength of OPCCB specimens with high accuracy for a/d ratios of 2.4-8.1. Hu and Wu [30] reported that ACI 318-14 [41] underestimated the shear strength of OPCCB with increasing a/d ratios of 1.9, 2.5, and 3.1 by 25%, 29%, and 19%, respectively.…”

Section: Ordinary Portland Cement Concrete Beamsmentioning

confidence: 99%

Experimental and Analytical Investigations on Shear Performance of Ambient-Cured Reinforced Geopolymer Concrete Beams

Abdullah,

Qazi,

Khan

et al. 2024

Buildings

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Geopolymer concrete (GPC) has emerged as a sustainable alternative to ordinary Portland cement concrete (OPCC) as GPC significantly reduces embodied carbon dioxide emissions. This study compared the shear behavior of reinforced OPCC beams and GPC beams of the same cross-section and compressive strength. The study tested nine beams under three-point bending to evaluate the effects of concrete type and shear span on the shear strength. The results showed that OPCC and GPC beams exhibited relatively similar reduction rates in the shear strength with increasing a/d ratios, while the failure mode shifted from shear in OPCC beams to shear-flexure in GPC beams. The maximum deflection of GPC beams significantly increased with increasing a/d ratios. Moreover, empirical shear strength equations, intended for OPCC beams in various design codes, underestimated the shear strength of GPC beams by about 11.0-26.9% at the a/d ratio of 4.3 but significantly underestimated the shear strengths of GPC beams by 77% at lower a/d ratios of 1.6 and 2.9. Therefore, modifications are proposed to the existing design OPCC shear strength equations to significantly improve the prediction accuracy for the shear strength of GPC beams.

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“…It will be shown below that the dowel effect in the case studied in this paper is very small. More recent work includes other variables such as the influence of time-dependent effects [16], the influence of time dependent effects plus corrosion [17], the influence of the slenderness of the cross section [18], the effect of axial forces [19], while others are trying to apply artificial intelligence to predict shear resistance [20], [21].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Distribution of Shear Forces Between Resisting Mechanisms in an RC Element Without Stirrups

Pérez Caldentey

2023

hya

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This paper explores how the shear force distributes itself among the three main shear resistance mechanisms: shear resistance of the uncracked compressed chord, aggregate interlock, and dowel effect. Today’s dominating shear models, the critical crack theory (Muttoni et al. [1]) and the compression field theory (Collins et al. [2]) maintain that the main shear-resisting mechanism is aggregate interlock, while more recent studies (Marí et al. [3]), maintain that the main resistance mechanism is the shear resistance on the uncracked compression chord. In this paper FEM modelling is used to study a test carried out at the Universidad Politécnica de Madrid (UPM) to try to assign the shear force to the different shear mechanisms for different loading steps and elucidate what finally causes the failure of the structure. The results show that as load is increased the relative part of the shear force taken by the uncracked compressed chord increases until finally shear failure is reached when the principal tensile stress in the area located close to the load but towards the support reaches the tensile resistance of concrete, generating a crack that precipitates the failure of the beam.

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Assessment of shear strength of reinforced concrete beams without shear reinforcement: A comparative study between codes of practice and artificial neural network

Cited by 14 publications

References 22 publications

Shear Behavior of Geopolymer Concrete Slender Beams

Shear Behavior of Geopolymer Concrete Slender Beams

Experimental and Analytical Investigations on Shear Performance of Ambient-Cured Reinforced Geopolymer Concrete Beams

A Study on the Distribution of Shear Forces Between Resisting Mechanisms in an RC Element Without Stirrups

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