A Simple Approach to Predict the Shear Capacity and Failure Mode of Fix-ended Reinforced Concrete Deep Beams based on Experimental Study

Arabzadeh, Abolfazl; Hizaji, Rouhollah

doi:10.5829/ije.2019.32.04a.03

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…Strut and tie models (STM) were proposed to evaluate the mode of failure and loading capacity of members [15,16]. The most recent study on RC portal frames subjected to lateral and cyclic loads was done by Gunasekaran and Choudhury [17].…”

Section: B Reinforced Cement Concretementioning

confidence: 99%

Stress-Strain Characteristics of Reactive Powder Concrete Under Cyclic Loading

Dhundasi¹,

Khadirnaikar²,

Momin

2022

IJE

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Reactive powder concrete (RPC) is a type of ultra-high strength cement composite material. It has advanced mechanical properties and shows high ductility characteristics. Many researches have shown that normal and high strength concrete fails under cyclic stresses at load level below its static capacity.In the present study, the mix design guidelines to produce high strength RPC is provided. RPC with compressive strength of 120, 130 and 140MPa was produced. The mechanical properties are obtained for hardened concrete. The present study focuses on the investigation of reactive powder concrete under uniaxial compressive cyclic loading. The investigation was carried out on cubical and cylindrical specimens. The behaviour of RPC under cylic loads is studied by obtaining the stress-strain characteristics under monotonic loading and cyclic loading. Three main types of tests were performed. Stress-strain envelope curve, common point curve and stability point curves were established under repeated load cycles. The limiting stress values required for design are provided. It was concluded that peak stress of the stability point curve could be regarded as the maximum permissible stress. A nonlinear analytical expression was proposed for the normalized stresses and strain which shows a precise fit with the experimental data. The expression will assist in predicting the cyclic response of concrete required for constructional applications.

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Section: B Reinforced Cement Concretementioning

confidence: 99%

Stress-Strain Characteristics of Reactive Powder Concrete Under Cyclic Loading

Dhundasi¹,

Khadirnaikar²,

Momin

2022

IJE

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“…Eyad et al [5], explored the impact of confining the strut region through the use of struts reinforcement, while Eyad et al [6], proposed an empirical formula for the strut efficiency factor (Bs) in RC deep beams, derived from a comprehensive analytical study based on the strut and tie model. Other researchers have numerically investigated main parameters influencing the behavior and shear capacity of RC deep beams [7,8]. Despite numerous experimental and numerical investigations into reinforced concrete deep beams, which have considered factors such as concrete compressive strength, (av/d) ratio, and reinforcement directions in relation to shear capacity, the current ACI 318R-5 [1] code and BS 8110 [9] codes still do not incorporate these factors comprehensively.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Empirical Modeling of Shear Strength Prediction in Reinforced Concrete Deep Beams

Sayhood,

Mohammed,

Hilo

et al. 2024

Preprint

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This paper presents a thorough investigation into the shear strength capacity of reinforced concrete deep beams, with a focus on improving predictive accuracy beyond existing code provisions. Analyzing 198 deep beams from 15 investigations, the study considers parameters such as concrete compressive strength (fc’), shear span to effective depth ratio (av/d), and reinforcement ratios (ρs, ρv, ρh ). Introducing a novel predictive model (Equation 7), the study rigorously evaluates it using nonlinear regression analysis and statistical metrics (MAE, RMSE, R2). The proposed model demonstrates a significant reduction in the coefficient of variation (COV) to 27.08%, surpassing existing codes' limitations. Comparative analyses highlight the model's robustness, revealing improved convergence of data points and minimal sensitivity to variations in key parameters. The findings suggest that the proposed model offers enhanced predictive accuracy across diverse scenarios, making it a valuable tool for structural engineers. This research contributes to advancing the understanding of shear strength in reinforced concrete deep beams, offering a reliable and versatile predictive model with implications for refining design methodologies and enhancing the safety and efficiency of structural systems.

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“…Shear failure is an undesirable mode of failure in reinforced concrete and usually occurs with a devastating consequence [1][2]. It is therefore a structural requirement that whenever the value of design shear stress exceeds the permissible shear stress of concrete, shear reinforcement must be provided [3][4].…”

Section: Introductionmentioning

confidence: 99%

Review of BS 8110, EC2, and the Improved EC2 shear resistance models for stirrup in reinforced concrete beams

Ayodeji¹,

Chinwuba²

2023

Res. Eng. Struct. Mater.

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The majority of beams used in construction have shear reinforcement provision. However, there exists a disparity in the results of the shear capacity guaranteed by the available shear design provisions. This is so because of the complex nature of the reinforced concrete shear mechanism. This study compares the BS 8110, EC2, and the Improved EC2 shear resistance models to ascertain the differences in their predictive ability when compared to experimental results. The EC2 is the most conservative at low level of shear reinforcement, i.e., shear reinforcement 𝜌 𝑤 𝑓 𝑦𝑤𝑚 ≤ 1.3 𝑀𝑃𝑎, and at 𝜌 𝑤 𝑓 𝑦𝑤𝑚 ≤ 2 𝑀𝑃𝑎 for mean value and design value predictions respectively. From the parametric trendline chart, the Improved EC2 predicts a higher shear capacity for lightly reinforced concrete beams than the EC2 shear model. A demerit point of 76 and 187 obtained respectively for the mean and design shear capacities of the BS 8110 shows that it is the most reliable of the three models in predicting the shear strength of stirrup-reinforced concrete beams.

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A Simple Approach to Predict the Shear Capacity and Failure Mode of Fix-ended Reinforced Concrete Deep Beams based on Experimental Study

Cited by 5 publications

References 12 publications

Stress-Strain Characteristics of Reactive Powder Concrete Under Cyclic Loading

Stress-Strain Characteristics of Reactive Powder Concrete Under Cyclic Loading

Comprehensive Empirical Modeling of Shear Strength Prediction in Reinforced Concrete Deep Beams

Review of BS 8110, EC2, and the Improved EC2 shear resistance models for stirrup in reinforced concrete beams

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