CFRP strengthening efficiency on enhancement punching shear resistance of RC bubbled slabs with openings

Oukaili, Nazar; Merie, Hammad

doi:10.1016/j.cscm.2021.e00641

Cited by 6 publications

(8 citation statements)

References 9 publications

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“…These gauges were placed at the previously designated locations in both orthogonal directions. Additional information on the test's setup and instrumentation may be found in [48,49].…”

Section: Description Of Tested Specimens Test Setup and Instrumentationmentioning

confidence: 99%

“…The average of three tests was recorded as ( f ′ c ). The range of the concrete compressive strengths ( f ′ c ) was 25.7 to 29.5 MPa [49]. The tested slabs were reinforced with mild steel bars of varying sizes.…”

Section: Concrete and Reinforcement Materialsmentioning

confidence: 99%

“…The mechanical properties of the steel bars that were used in this experimental program were evaluated in compliance with ASTM A615 [51]. Additional information on the mechanical properties of the concrete and steel may be found in [48,49].…”

Section: Concrete and Reinforcement Materialsmentioning

confidence: 99%

“…Nonetheless, studies indicate that a punching shear failure in solid flat slabs happens when severe tangential squeezing, caused by global flexural curvature, distresses the compression concrete fibers close to the column region [12,38,54,55]. Incorporating the flange's impact into compression improves accuracy and reduces the disparities between experimental and numerical results [11,19,21,24,49,56]. Valivonis…”

Section: Generalmentioning

confidence: 99%

“…A numerical investigation was carried out to support this concept theoretically. The finite element program ANSYS was utilized to simulate the experimental slabs and generate the stress distribution in all regions of the tested biaxial voided slabs during the loading process until they failed [49]. A dense mesh was created using the SOLID-65 According to the results shown in Figure 5, all tested slabs experienced cracks that extended beyond the section that was (2d) from the borders of the column during the failure stage.…”

Section: Design Recommendationsmentioning

confidence: 99%

See 4 more Smart Citations

Reduced Volume Approach to Evaluate Biaxial Bubbled Slabs’ Resistance to Punching Shear

Oukaili,

Merie,

Allawi

et al. 2024

Buildings

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The bubbled slab, a type of reinforced concrete (RC) slab with plastic voids, is an innovative design that employs a biaxial distribution of voiding formers within the slab to reduce the slab’s self-weight while preserving a load-carrying capacity that is approximately comparable to that of solid slabs. This paper presents a new approach for figuring out the effective critical shear perimeter of voided slabs using the reduced-volume concept of concrete. This approach aims to reduce the coefficient of variation of the current design standards, namely the ACI 318-19 and Eurocode 2, for assessing the slabs’ resistance to punching shear. Our experimental program investigated the impact of voiding former patterns and the location of an opening near a column on the punching shear resistance of biaxial hollow slabs. The factors under consideration included the opening’s size, location, and distance from the loaded area, as well as the voiding formers’ placement concerning the critical shear boundaries. The results of experiments on 10 full-scale, 2000 × 2000 × 230 mm, reinforced concrete biaxial voided slabs with an opening are presented in this study. Two design expressions were used to estimate the biaxial hollow slabs’ shear strength. These expressions take into account the reduced volume of concrete and the distribution of voiding formers up to the section 4d from the periphery of the column. The proposed approach to determine the effective punching shear perimeter has the lowest coefficient of variation among the methods suggested by these standards. This indicates the validity of our proposed expressions. The coefficient of variation of the proposed expressions does not exceed 0.057.

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“…These gauges were placed at the previously designated locations in both orthogonal directions. Additional information on the test's setup and instrumentation may be found in [48,49].…”

Section: Description Of Tested Specimens Test Setup and Instrumentationmentioning

confidence: 99%

Section: Concrete and Reinforcement Materialsmentioning

confidence: 99%

Section: Concrete and Reinforcement Materialsmentioning

confidence: 99%

Section: Generalmentioning

confidence: 99%

Section: Design Recommendationsmentioning

confidence: 99%

See 3 more Smart Citations

Reduced Volume Approach to Evaluate Biaxial Bubbled Slabs’ Resistance to Punching Shear

Oukaili,

Merie,

Allawi

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

Experimental Analysis of Bubble Deck Slab and Its Application for Sustainability in the Ecology Dimension

Akın¹,

Preethi²,

Vignesh³

2023

Lecture Notes in Civil Engineering

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Effect of openings on simply supported reinforced concrete skew slabs using finite element method

2023

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Reinforced concrete skew slabs are commonly used in bridges due to space constraints in motorways and in congested urban areas. Such slabs also often need to contain openings for architectural requirements or services, and this study seeks to determine the effect of these openings on the strength of the skew slabs. The finite element method was used to analyze 13 cases of slabs with skew angles of 45°. The first and second cases were used to validate the results with experimental work. Other cases studied the effect of the position and shape of openings on the strength of the skew slabs under both one-point and four-point loading conditions. The study also showed that the worst location for the opening was near the obtuse corners since this is where most of the load is transferred. With respect to the shape of openings, three different shapes with the same area were used: skew, circle, and square shapes. It was found that the effect of the opening shape depends on how many steel reinforcements are removed, as well as the appearance of negative cracking brought on as a result of the opening. Overall, the square shape introduces the smallest reduction in the skew slab strength compared with a slab with no opening. Accordingly, the study recommends that the strength of skew slabs can best be maintained if square openings are employed near the acute corners, alongside negative steel reinforcement to avoid cracking.

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CFRP strengthening efficiency on enhancement punching shear resistance of RC bubbled slabs with openings

Cited by 6 publications

References 9 publications

Reduced Volume Approach to Evaluate Biaxial Bubbled Slabs’ Resistance to Punching Shear

Reduced Volume Approach to Evaluate Biaxial Bubbled Slabs’ Resistance to Punching Shear

Experimental Analysis of Bubble Deck Slab and Its Application for Sustainability in the Ecology Dimension

Effect of openings on simply supported reinforced concrete skew slabs using finite element method

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