Nonlinear Finite Element Analysis of Punching Shear Strength of Eccentrically Loaded RC Flat Slabs with Opening

Živković, Smilja; Bešević, Miroslav; Purčar, Martina Vojnić; Kozarić, Ljiljana

doi:10.1007/s12205-019-0075-5

Cited by 16 publications

(4 citation statements)

References 13 publications

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“…Moreover, flat slab-column systems generally minimize the floor height causing lower total building height and offering clearer space and lower material cost due to the absence of additional structural elements such as beams and column capitals. Consequently, an extensive study on the design and construction technologies of flat slab-column systems has been performed, providing solid design methods, technical codes, and efficient tools [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…It was stated that the results were in good agreement with the finite element analysis results. After a detailed literature review to determine the maximum punching bearing strength values of opening two-way reinforced concrete slabs within the scope of the study, Živković et al [5]; Pinto et al [6]; Augustin et al [7]; Lourenço et al [8]; Bompa and Onet [19]; Oukaili and Salman [20]; Durucan and Anil [21]; Ha et al [22]; Ilbegyan et al [23]; Abduljaleel et al [24]; Silva et al [25]; Balomenos et al [26]; Liberati et al [27]; Kormosova et al [28] have been found. After a comprehensive literature review, the limited number of studies listed above were found, examining the effects of openings on the maximum bearing capacity of two-way reinforced concrete slabs under punching loading.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Many researchers in Brazil and abroad have studied the influence of openings close to columns in reinforced concrete flat slabs. [3][4][5][6][7][8][9][10][11][12][13][14] Although the structural system of flat slabs is widely applied in structural projects, the models proposed by the codes and normative prescriptions have limited experimental observations. 8 The current design codes for punching shear account for the effect of openings on the slab's ultimate capacity based on size and location, by reducing the critical/control perimeter.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it induces greater shear stresses, and the openings make it difficult for the flexural and shear reinforcement to be placed more efficiently. Many researchers in Brazil and abroad have studied the influence of openings close to columns in reinforced concrete flat slabs 3–14 …”

Section: Introductionmentioning

confidence: 99%

Nonlinear analysis of the impact of openings on punching shear strength

Vieira,

Díaz,

Marques

et al. 2023

Structural Concrete

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Reinforced concrete flat slab projects usually require openings close to the columns for electrical and hydraulic installations. Since such openings reduce the punching shear of slabs, a comprehensive study is needed. In this paper, numerical models of slabs tested in literature were elaborated upon, using the commercial software in finite elements DIANA. The physical nonlinearity of the materials was considered. After the calibration and validation of the numerical parameters related to concrete and reinforcement, 62 numerical models were created for performing a parametric analysis. The numerical analysis aimed to study the effect of openings close to the columns and verify the punching resistance reduction. In this parametric study, the main variables were the compressive strength of the concrete, the bending reinforcement ratio, the number of openings, and the distance from the openings to the column's face. Finally, the numerical results obtained were compared with the punching strength values provided by the main structural design codes, viz., NBR 6118 (2014), Eurocode 2 (2004), ACI 318 (2019), fib Model Code (2010), and the next generation of Eurocode 2, which are constantly questioned in academic papers regarding their safety.

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Numerical analysis on flat slabs with openings and SHEAR reinforcement

Costa,

Pereira,

Ruas

et al. 2024

Structural Concrete

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The present study aims to parameterize the numerical models of flat slabs based on five experimental prototypes developed previously. The analyzed slabs had dimensions of 1800 mm × 1800 mm and a thickness of 130 mm. Two slabs did not have openings, and three slabs had stud‐type shear reinforcement. Subsequently, five new slab models were selected with position variations and several openings, with a fixed diameter of 75 mm and without shear reinforcement. After calibration of the models, the following results were obtained: the numerical rupture load approached at least 90% of the experimental rupture load, and the rupture modes and cracking patterns were similar to those observed in the experimental models. When it is impossible to move the column openings vertically, it is more beneficial to position them at the corners of the column rather than close to the same face of the column. Thus, it was possible to numerically analyze the effects of the position and number of openings in flat slabs.

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Nonlinear Finite Element Analysis of Punching Shear Strength of Eccentrically Loaded RC Flat Slabs with Opening

Cited by 16 publications

References 13 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

Nonlinear analysis of the impact of openings on punching shear strength

Numerical analysis on flat slabs with openings and SHEAR reinforcement

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