Shear Strength Models for Reinforced Concrete Slender Beams: Comparative Analysis and Parametric Evaluation

Ma, Cailong; Guo, Zheyi; Wang, Wenhu; Qin, Yongjun

doi:10.3390/buildings13010037

Cited by 7 publications

(3 citation statements)

References 61 publications

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“…The "size effect in shear" is often defined in literature as the decrease in shear capacity of reinforced concrete beams with the increase in a member depth. Such definition was demonstrated in several papers [10][11][12][13][14][15][16][17][18][19]. To illustrate the size effect in shear, test results obtained by Bažant and Kazemi [11] are presented in Figure 2.…”

Section: Introductionmentioning

confidence: 77%

Numerical Analysis of Cracking Processes in RC Beams without Transverse Reinforcement

Smarzewski

Słowik

2023

Processes

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The procedure of FEM calculations was presented in the paper. The numerical calculations concerned a simulation of crack distribution and propagation in concrete beams reinforced longitudinally without shear reinforcement. The analysis of the obtained FEM results showed different modes of failure in the beams when shear span-to-depth ratio was a/d = 2.5 and a/d = 1.8. In the analyzed beams, the ratio of longitudinal reinforcement and the mechanical properties of the steel bars were also changing parameters. The FEM results have showed that the shear failure of reinforced concrete beams without transverse reinforcement significantly depends on the ratio and yield strength of longitudinal steel bars. Furthermore, the results of numerical calculation for the beams of a/d = 2.5 were also juxtaposed with experiments performed by the author on two longitudinally reinforced concrete beams.

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Section: Introductionmentioning

confidence: 77%

Numerical Analysis of Cracking Processes in RC Beams without Transverse Reinforcement

Smarzewski

Słowik

2023

Processes

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“…Moreover, the difference in the experimental and analytical shear strengths decreased with an increase in a/d ratio from 1.6 to 4.3. Ma et al [72] also reported a large difference in the experimental and analytical shear strengths of OPCCB specimens estimated using ACI 318-19 [40] and JSCE 2007 [43] at lower a/d ratios and the difference between experimental and analytical shear strengths were decreased with an increase in a/d ratio from 2.5 to 7.5. Buildings 2024, 14, x FOR PEER REVIEW 17 of 24…”

Section: Analytical Results and Discussionmentioning

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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“…The existing shear strength formulas of RC beams can be classified into five categories based on mechanisms and methodologies including; empirical models, semi-empirical models, mechanics-based approaches, probabilistic models and machine learning-based models (Ma et al, 2023). Zsutty (1968) developed empirical models that incorporated f c , ρ and a/d as parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of width-to-depth and effective length-to-depth ratio on shear strength of reinforced concrete slender beams without shear reinforcement: comparative analysis

Adamu,

Aure,

Mohammed

2024

MMMS

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PurposeFrom the factors that affect shear strength of reinforced concrete (RC) beams, the study examines the effect of controversial parameters, width-to-depth (b/d) and effective length-to-depth (leff/d) ratio on shear strength of RC slender beams.Design/methodology/approachThe researchers utilized a database of 676 experimental test results from ACI-DAfStb database, Conducted regression analysis to examine relationship between b/d and leff/d ratios and shear strength, compare and analyze sensitivity to changes in b/d and leff/d ratios for the selected 12 shear models for RC beams.FindingsIncreasing b/d ratio enhanced shear strength until b/d ˜ 3, but further increases had limited impact and increasing leff/d ratio resulted in decreased shear strength. From comparative analysis, the models provided by various design standards were found to be safe, with EC-2 and JSCE models being conservative. From considered research models, Campione and Arslan models were conservative, while Kim and White model were observed to be unsafe. Sensitivity analysis indicated ACI318-19, JSCE, CEB-FIP-90 and Arslan models were sensitive to changes in b/d and leff/d ratios. National code models generally captured shear strength characteristics well. Certain models suggested a constant/decreasing b/d effect despite observed shear strength enhancement. Most models indicated improved shear strength with an increasing leff/d ratio, contrary to experimental findings while TS500 and Hwang models aligned with experimental results.Research limitations/implicationsThe study's limitations include the dependence on the available database, which may not encompass all possible experimental scenarios. Further research should aim to expand the database and investigate additional parameters that may influence shear strength in RC beams.Practical implicationsThe findings of this study have practical implications for the design and analysis of RC beams by suggesting that the width-to-depth and length-to-depth ratios should be carefully considered to optimize shear strength. The identified models can assist engineers in selecting appropriate shear strength prediction models based on specific design scenarios.Social implicationsThe study contributes to the advancement of knowledge in the field of reinforced concrete beam design, which has implications for the safety and reliability of structural systems. By understanding the factors influencing shear strength, engineers can design more efficient and robust structures, ensuring the safety of buildings and infrastructure.Originality/valueThis study provides valuable insights into the influence of the width-to-depth and effective length-to-depth ratios on shear strength in reinforced concrete beams. It contributes to the understanding of these factors and their impact on shear strength, addressing the lack of consensus among researchers. The comparative analysis of shear models and the sensitivity analyses add value by identifying the models that align better with experimental observations. The study emphasizes the need for accurate models that account for these factors and highlights the importance of further research to refine and develop improved predictive models.

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Shear Strength Models for Reinforced Concrete Slender Beams: Comparative Analysis and Parametric Evaluation

Cited by 7 publications

References 61 publications

Numerical Analysis of Cracking Processes in RC Beams without Transverse Reinforcement

Numerical Analysis of Cracking Processes in RC Beams without Transverse Reinforcement

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

Influence of width-to-depth and effective length-to-depth ratio on shear strength of reinforced concrete slender beams without shear reinforcement: comparative analysis

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