Punching shear strength of reinforced concrete slabs with plastic void formers

Valivonis, Juozas; Skuturna, Tomas; Daugevičius, Mykolas; Šneideris, Arnoldas

doi:10.1016/j.conbuildmat.2017.04.057

Cited by 35 publications

(16 citation statements)

References 16 publications

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“…In this paper, for different ratios of axial load acting on the beam to Euler buckling load, analytical solutions and frequency factors are evaluated. It is shown that the results obtained by VIM method in this paper are in compliance with the differential transform method (DTM) results for fixed-pinned case [10][11][12][13][14]. Also, homotopy perturbation method (HPM) was applied for free vibration of a beam on elastic foundation by Ozturk and Coskun [15].…”

Section: Introductionsupporting

confidence: 70%

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The Comparison of Punching Shear Capacity in Solid and Void Two-Way Slabs on Soil Substrate in Relation to Spring Stiffness Changes

Azizian

Lotfollahi-Yaghin

Behravesh

2020

IJE

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This study aims to investigate punching shear in solid and void slabs as well as simulated soil and spring models as distributed loads on the mentioned slabs. To this end, the slabs were tested using the nonlinear finite element analysis under static loading to assess their failure in terms of the final load and cracking patterns on the soil substrate and spring. For this purpose, a 3D finite element analysis was performed based on the element size, mesh, and concrete characteristic modeling. In Finite Element Software ABAQUS 6.19, the nonlinear behavior of brittle materials was defined based on the concrete damaged plasticity (CDP) model. Next, the results of the numerical analysis of the slabs were calibrated and validated based on a comparison with experimental specimens on a soil substrate. At the end, by optimizing the spring constant and obtaining the soil spring constant, the results of the numerical analysis of the slabs on the spring support were compared to the experimental results, which showed the calibrated models correctly predicted the punching cutting response of the slabs.

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Section: Introductionsupporting

confidence: 70%

“…Table 3 lists the mechanical features of the test slab bars. The bars located at the bottom and top substrates were 8 mm in width [12].…”

Section: Specimens and Materialsmentioning

confidence: 99%

The Comparison of Punching Shear Capacity in Solid and Void Two-Way Slabs on Soil Substrate in Relation to Spring Stiffness Changes

Azizian

Lotfollahi-Yaghin

Behravesh

2020

IJE

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“…In research context, some authors have limited this solid concrete area to a cross type configuration, by also using shear reinforcement in these concrete solid zones. 7 By testing lightweight type slabs with this concrete solid cross type configuration, as well as slabs with lightweight components in their total area, they verified that the first type of slabs has presented a punching capacity 18% higher than the one registered in the second type slab. 7 Held and Pfeffer 4 tested six BD slabs without solid concrete zones around the vertical supporting elements and without punching reinforcement.…”

Section: Introductionmentioning

confidence: 80%

“…7 By testing lightweight type slabs with this concrete solid cross type configuration, as well as slabs with lightweight components in their total area, they verified that the first type of slabs has presented a punching capacity 18% higher than the one registered in the second type slab. 7 Held and Pfeffer 4 tested six BD slabs without solid concrete zones around the vertical supporting elements and without punching reinforcement. This experimental program was composed by two series of three slab prototypes, one with slab's dimensions of 2,500 × 2,500 × 240 mm 3 , and the other of 2,500 × 2,500 × 450 mm 3 , made by concrete of average compressive strength of 30 and 40 MPa, respectively.…”

Section: Introductionmentioning

confidence: 80%

“…In floor plates with void formers, a certain area around their vertical structural supports does not include lightweight components in order to guarantee the required punching capacity. In research context, some authors have limited this solid concrete area to a cross type configuration, by also using shear reinforcement in these concrete solid zones . By testing lightweight type slabs with this concrete solid cross type configuration, as well as slabs with lightweight components in their total area, they verified that the first type of slabs has presented a punching capacity 18% higher than the one registered in the second type slab …”

Section: Introductionmentioning

confidence: 99%

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Punching behavior of BubbleDeck type reinforced concrete slabs

Nicácio

Barros

Melo

2019

Structural Concrete

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The BubbleDeck type slab (BD) is a reinforced concrete (RC) flat slab that includes recycled plastic hollow spheres (RPHS) in its core for decreasing its dead weight. However, punching capacity of BD slabs can be a critical aspect, thereby this work is devoted to assess experimentally its punching behavior. An experimental program composed of four real scale prototypes, representative of RC flat slabs in punching loading conditions, was carried out. Two of these slabs are of BD type, while the other two do not include the RPHS system, herein denominated as RC solid slab (SS). The test results show that all the tested slabs failed in punching after the occurrence of yield initiation of the flexural reinforcement. The punching capacity and the deflection at failure of BD type slab has decreased up to 14% and up to 44%, respectively, when compared to the corresponding SS type slab. A relatively small ductility index was obtained (between 1.51 and 2.65). In BD type slabs, the punching failure surface had tendency to propagate through the RPHS, at an inclination angle of about 45°.

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An investigation of punching shear in flat slabs with spherical voids using the finite element method

Schimanowski,

Campos Filho,

Lazzari

et al. 2024

Structural Concrete

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Flat slabs with voids allow for the reduction of the structure's self‐weight by removing concrete from regions of the cross‐section subjected to low stresses. However, the presence of voids impacts the behavior of these structures, especially under punching loads, and few studies have assessed the impact of different parameters on voided slabs. Thus, this study validated numerical modeling developed in the ANSYS software, using the finite element method, based on 17 experimental slabs from the literature. The numerical simulation indicated a good approximation of the deformation behavior of the structure, as well as a similar mode of failure. Once validated, the model evaluated different parameters in spherical voided slabs. The results showed significant impacts on the rupture load, ductility, or stiffness when varying the void's presence, position, diameter, concrete properties, slab thickness, flexural reinforcement ratio, and shear reinforcement. In voided slabs, the critical situation occurred when inserting the spheres in a region very close to the column, which reduced the rupture load by about half, when compared to a solid slab.

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Punching shear strength of reinforced concrete slabs with plastic void formers

Cited by 35 publications

References 16 publications

The Comparison of Punching Shear Capacity in Solid and Void Two-Way Slabs on Soil Substrate in Relation to Spring Stiffness Changes

The Comparison of Punching Shear Capacity in Solid and Void Two-Way Slabs on Soil Substrate in Relation to Spring Stiffness Changes

Punching behavior of BubbleDeck type reinforced concrete slabs

An investigation of punching shear in flat slabs with spherical voids using the finite element method

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