Punching shear strength of waffle flat slabs with opening adjacent to elongated columns

Aguiar, Amaury Jose Oliveira de; Oliveira, Dênio Ramam Carvalho de; Reis, Luciano; Nzambi, Aaron

doi:10.1016/j.engstruct.2021.112641

Cited by 12 publications

(9 citation statements)

References 11 publications

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“…However, after extensive research in the literature, very few studies using a similar approach have been found. Aguiar et al [45] proposed to correct the slab without opening capacity by multiplying it by a coefficient in the equation they developed using a similar approach to the authors. When the correction coefficients are examined, it is seen that only the cmax column maximum width and the bo effective punching circumference are included in the correction coefficient.…”

Section: Proposed Equationmentioning

confidence: 99%

Empirical Punching Shear Capacity Equation for Reinforced Concrete Two-way Slabs with Openings

Köroğlu,

Anil,

Hatem

2024

Period. Polytech. Civil Eng.

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This study proposes a new equation to estimate the punching shear capacity of Two Way Reinforced Concrete Flat Slab Column (TRFSC) connections with openings. The TRFSC connections with openings in the literature were simulated using the finite element modeling technique. Then, the test results were used to calibrate and verify the finite element model. Next, the number of test data was artificially increased using the finite element model to cover a wide range of critical perimeters. Finally, the effects of several parameters such as the size of the openings in the reinforced concrete slabs, their position, and distance concerning the column on which the punching loading is applied on the variation of punching shear load capacity of TRFSC connections with openings were observed, the results showed that the proposed equation generally gave better results than the several current code equations. For the study used in the verification of the finite element model, it was observed that the ratios of the punching capacity values calculated using the experimental results and the regulations varied between 0.79 and 0.92 on average, and the regulations gave results that were not on the safe side for TRFSC connections with openings. However, with the nonlinear correction coefficient proposed in this study, the ratios of the experimental results and analytically calculated capacity values were calculated as 1.10 on average, and the standard deviation and variant values decreased much more.

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Section: Proposed Equationmentioning

confidence: 99%

Empirical Punching Shear Capacity Equation for Reinforced Concrete Two-way Slabs with Openings

Köroğlu,

Anil,

Hatem

2024

Period. Polytech. Civil Eng.

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“…The viscosity parameter value chosen was 0.00001 in such a way as to decrease the sensitivity of the results to the viscoplastic regularization in ABAQUS/Standard (implicit integration). However, in the literature, the values applied to vary significantly: between 0.00001 and 0.05, for instance [14,17,[55][56][57]. In practice, a viscosity parameter is a numerical tool used in the CDP model to improve convergence and eventually increase the speed of the simulation through the damping of the crack propagation through the numerical models.…”

Section: Plasticity Parametersmentioning

confidence: 99%

“…In the last years, guidelines for NLFEA were developed that focused on using total strain fixed and rotating cracking models [68][69][70][71][72][73]. Nevertheless, the modeling choices using the Concrete Damaged Plasticity Model were not fully covered and were generally varied significantly between different publications [13,39,55,56]. In this study, we discussed the effect of these modeling choices of the CDP to predict the ultimate capacity of slabs failing in one-way shear and punching shear.…”

Section: Recommendations For Nlfea Using the Cdpmentioning

confidence: 99%

NLFEA of one-way slabs in transition between shear and punching: Recommendations for modeling

Sousa¹,

Lantsoght²,

Genikomsou³

et al. 2023

Engineering Structures

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“…In reinforced concrete flat slab buildings, the slab-column connections are often subject to horizontal and vertical forces and unbalanced bending moments. The punching shear failure of slab-column connections subjected to concentric loads is a crucial design aspect, and it has been the subject of study by several authors [1][2][3][4][5][6][7][8][9][10]. The application of eccentric loads, generated by different distances between columns, by unequal loads applied to the slab panel, or by the incidence of horizontal loads on the structures, results in a non-uniform distribution of shear stresses around the column, which can, in many cases, diminish the load-carrying capacity of the slab-column connection.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of the Punching Shear Strength of Flat Slabs Subjected to Balanced and Unbalanced Moments

Mendes,

Mesquita,

Ferreira

et al. 2024

Buildings

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In reinforced concrete flat slab buildings, the transference of unbalanced moments in the slab–column connections usually results from the asymmetry of spans, vertical loads, and horizontal forces from the wind. The punching strength of the slab–column connections can limit the load-carrying capacity of the structure in these cases, leading to structural collapse. The design code provisions are still based on empirical or semi-empirical equations; as the punching shear failure mechanisms are complex, and the ultimate strength is affected by several parameters. In this context, this paper presents the results of the computational investigation of the mechanical behaviour of flat slabs subjected to balanced and unbalanced moments using numerical Finite Element models. The numerical models were calibrated and accurately reproduced the behaviour and the punching resistance for concentric and eccentric loading. Furthermore, a parametric study was conducted to evaluate the mechanical behaviour of flat slabs under different load eccentricities, confirming that the increase in the unbalanced moment negatively impacts the load-carrying capacity of the slab–column connection. Furthermore, it was observed that all computational results obtained from models with unbalanced bending moments were higher than those estimated by the design codes.

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Punching shear strength of waffle flat slabs with opening adjacent to elongated columns

Cited by 12 publications

References 11 publications

Empirical Punching Shear Capacity Equation for Reinforced Concrete Two-way Slabs with Openings

Empirical Punching Shear Capacity Equation for Reinforced Concrete Two-way Slabs with Openings

NLFEA of one-way slabs in transition between shear and punching: Recommendations for modeling

Numerical Evaluation of the Punching Shear Strength of Flat Slabs Subjected to Balanced and Unbalanced Moments

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