A numerical study on flexural behavior of biaxial voided slabs containing steel cages

Khouzani, Mohsen Amoushahi; Zeynalian, Mehran; Hashemi, Mahmoud; Mostofinejad, Davood; Farahbod, Farhang; Shahadifar, Mohsen

doi:10.1016/j.jobe.2021.103382

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…2 Cross sections and reinforcement details of the slabs in Group S-N (distances in cm and rebar dimensions in mm) Fig. 1 Group S-N slabs mentioned above, it was stated that the results from the analytical models were compatible with the experimental results [18,25,29,32].…”

Section: Analytical Modelling Using Finite Element Methodsmentioning

confidence: 63%

“…values are transferred from node to node and the type of the analysis method affects the results. Since many researchers modeled the reinforced concrete slabs using ABAQUS software which considers Explicit Dynamic Analysis (EDA) [18,25,29,32], same software and technique was utilized in this study. There are some behavioral problems during the modeling process of reinforced concrete members such as dynamic effects, non-linear behavior, plastic deformations and contact uncertainty [45,46].…”

Section: Analytical Modelling Using Finite Element Methodsmentioning

confidence: 99%

“…In addition, compression reinforcement was stated to have an insignificant effect on the moment capacity. Therefore, although it is given for the solid members, ACI318-19 [66] and Eurocode 2 [60] was stated to be utilized to calculate the moment capacity of the voided slabs [23,32]. Contrarily, Lee et al [67] indicated that cracking moment predictions made in ACI318-19 [66] were nonconservative for voided slabs.…”

Section: Recommended Moment Capacitymentioning

confidence: 99%

“…The other technique to reduce the weight is to create intentional voids in the cross-section of the slabs. Several void shapes; donut [18][19][20], spherical [21][22][23][24][25][26][27][28], cuboid [1 and 28-31], ellipsoidal [27,32,33], flat void [21] etc. were used and several configurations (discrete void, continuous void etc.)…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Voids on Flexural Capacity of Reinforced Concrete Slabs

Kıpçak

Erdil

Karaşin

2023

Period. Polytech. Civil Eng.

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The voided reinforced concrete slab system is mainly produced with polyester foam placed mostly at the bottom of the slab. The aim of the voids is to reduce the weight of the slab. In this paper behavior of the voided reinforced concrete slabs in which voids placed at the mid-height of the slab cross-section, is examined analytically. A series of models were created to come up with a lightweight slab. Two distinct slab models were analyzed using the ABAQUS software. In the first group, slabs had three layers, in which bottom and top layers were of solid reinforced concrete, but the mid layer was of voided unreinforced concrete. In the second layer, in order to increase the contact between top and bottom layers of the slab, crossties were utilized, and the mid layer was reinforced accordingly. Since all the layers were 5 cm thick, the total thickness of the slabs were 15 cm. Slabs were 100 cm wide and 200 cm long. They were simulated the three-point bending test. Concrete damaged plasticity material model (CDPM) for concrete and elastoplastic material model for steel was selected. From the results it was found that moment capacity decreased with the increase in the volume of the voids. There was a sudden decrease in strength after reaching the yield strength in voided slab without a crosstie. In addition, crossties enabled the reduction of the weight of the slabs without significant decrease in moment capacity.

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Section: Analytical Modelling Using Finite Element Methodsmentioning

confidence: 63%

Section: Analytical Modelling Using Finite Element Methodsmentioning

confidence: 99%

Section: Recommended Moment Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Voids on Flexural Capacity of Reinforced Concrete Slabs

Kıpçak

Erdil

Karaşin

2023

Period. Polytech. Civil Eng.

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“…The concrete in the top area of the slab forms the compression block necessary for flexural resistance. Additionally, the concrete in the tension zone of the slab needs to bond with reinforcement to enhance the effectiveness of the reinforcement for flexural resistance [2][3][4]. The flanges at the top and bottom of the section are preserved, as high stresses can be generated there.…”

Section: Introductionmentioning

confidence: 99%

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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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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A numerical study on flexural behavior of biaxial voided slabs containing steel cages

Cited by 5 publications

References 9 publications

The Effect of Voids on Flexural Capacity of Reinforced Concrete Slabs

The Effect of Voids on Flexural Capacity of Reinforced Concrete Slabs

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

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

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