Experimental and numerical study on the cracking behavior and flexural strength of RC shallow beams with rectangular opening and varying length

Daniel, J. Jebasingh

doi:10.1016/j.istruc.2022.04.040

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…The size and location of the opening significantly affect the structural behavior of RC beams. Numerous studies have been conducted on RC beams with different opening shapes, sizes, and locations [3][4][5][6][7][8][9][10][11]. They reported that openings in the shear zone reduce RC beams' stiffness and load-carrying capacity more than that in the flexure zone.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Shear Capacity of RC Beams with Web Openings in Shear Zones Using Pre-Stressed Fe-SMA Bars: Numerical Study

et al. 2023

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Openings in the shear span can significantly affect the structural behavior of reinforced concrete (RC) beams, particularly in terms of shear capacity and crack propagation. This paper aims to investigate the feasibility of strengthening the web opening in the shear zone of RC beams by using iron-based shape memory alloy (Fe-SMA) bars, providing valuable insights for structural engineers and researchers. Numerical analysis with ABAQUS/CAE 2020 software was employed in the current study. The research was divided into six groups of beams with web openings of different lengths (150, 300, and 450 mm), prestressing levels (0%, 30%, and 60%), and reinforcement diameters (14, 18, and 22 mm) of Fe-SMA bars. The results show that the presence of web openings can cause a significant reduction in the cracking and ultimate loads of the beams, with reductions ranging from 11% to 50% and 36% to 48%, respectively. However, by adding pre-stressed Fe-SMA bars around small web openings (100 × 150 mm), the shear capacity of the beam is restored, and the beam exhibits behavior similar to solid beams. Additionally, activating the Fe-SMA bars by 30% and 60% resulted in almost similar cracking loads but improved load-carrying capacity of the beam with small openings by 12% and 9%, respectively, compared to the solid beam. The technique proposed for enhancing shear strength is most effective for beams with small (100 × 150 mm) and medium (100 × 300 mm) web openings as it can restore both the beam’s shear strength and stiffness. However, for beams with larger web openings (100 × 450 mm), the use of activated Fe-SMA beams can recover almost 90% of the solid beam’s shear capacity. Furthermore, reinforcing small openings with Fe-SMA bars of different diameters enhances beam shear capacity and stiffness, while for larger openings, higher Fe-SMA reinforcement ratios could potentially restore the beam’s full strength and stiffness. This study emphasizes the importance of strengthening web openings in RC beams, particularly in shear zones, and provides significant insights into how to strengthen beams with web openings, thereby contributing to developing safer structures. However, further laboratory experiments are recommended to validate, complement and extend the findings of this numerical study.

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Section: Introductionmentioning

confidence: 99%

“…Plenty of studies reported different classifications of web openings in RC beams in terms of size, shape, location, and execution time [6]. Somes et al considered the circular opening as "large" when its diameter exceeds 25% of the total beam depth [14].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Shear Capacity of RC Beams with Web Openings in Shear Zones Using Pre-Stressed Fe-SMA Bars: Numerical Study

et al. 2023

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Experimental and numerical investigation of bending performance of prestressed purlins having different longitudinal web opening

Aksoylu,

Özkılıç,

Çeledir

et al. 2024

Structures

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Shallow and Wide RC Beams, Definition, Capacity and Structural Behavior – Gap Study

Soliman,

Mansour,

Ebid

et al. 2023

TOCIEJ

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Wide beam, shallow beam, and banded beam are almost equivalent terms for beams with limited depth and large width. They are often embedded in ribbed slabs to facilitate the formwork. The contribution of web reinforcement in the shear capacity of this type of beam is still a gray area, and all design codes neglected this contribution. The aim of this research is to introduce a general overview of this topic and detect the unstudied gaps in this topic. Nine design codes and about forty previous researches were collected, summarized, analyzed, classified, and mapped with respect to the considered parameters, utilized methodologies, recorded observations, and concluded outcomes to detect further research opportunities. The results indicated that design codes have no unified definition for the shallow or wide beams; most of them neglected the contribution of the shear reinforcement. On the other hand, the analysis of the collected research considering 32 points of the study showed that only 19 points are well studied; it also indicated an extreme shortage in both theoretical studies (using “Finite Element Method” FEM) and predictive models (mathematically using “Artificial Intelligence” AI) for the shear capacity besides the effect of creep and cyclic loading, especially for beams with web openings.

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Experimental and numerical study on the cracking behavior and flexural strength of RC shallow beams with rectangular opening and varying length

Cited by 4 publications

References 5 publications

Enhancing the Shear Capacity of RC Beams with Web Openings in Shear Zones Using Pre-Stressed Fe-SMA Bars: Numerical Study

Enhancing the Shear Capacity of RC Beams with Web Openings in Shear Zones Using Pre-Stressed Fe-SMA Bars: Numerical Study

Experimental and numerical investigation of bending performance of prestressed purlins having different longitudinal web opening

Shallow and Wide RC Beams, Definition, Capacity and Structural Behavior – Gap Study

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