Flat Slabs in Eccentric Punching Shear: Experimental Database and Code Analysis

Vargas, Daniel; Lantsoght, Eva O. L.; Genikomsou, Aikaterini S.

doi:10.3390/buildings12122092

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Typically, connections between slabs and columns positioned at corners and edges experience moment transfer and eccentric loading. However, these scenarios have received less attention in research compared to internal slab-column connections subjected to concentric loads [9].…”

Section: Punching Shear Model Adopted In Aci 44011-22mentioning

confidence: 99%

“…The comparison was conducted using statistical measures, including average (Avg), standard deviation (SD), coefficient of variation (CoV), and absolute average error (AAE) of the experimentalto-predicted ratios (Vexp/Vpred). The AAE was calculated according to Equation (9). In addition, the number of specimens with Vexp/Vpred < 0.75 is reported.…”

Section: Assessment Of Design Provisionsmentioning

confidence: 99%

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Punching Shear of FRP-RC Slab–Column Connections: A Comprehensive Database

Almomani,

Alawadi,

Tarawneh

et al. 2024

J. Compos. Sci.

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Several design standards have been developed in the last two decades to estimate the punching capacity of two-way reinforced concrete (RC) slabs reinforced with fiber-reinforced polymer (FRP) reinforcement. FRP-RC design standards include the recently published ACI 440.11-22, CSA/S806-12, and JSCE-2007. These models are either based on empirical data or semi-empirical methods and calibrated using different databases. Additionally, these standards do not have provisions for connections with shear reinforcement. Therefore, a reliable worldwide database for developing and assessing the applicability of such provisions with test results is vital. This study presents a worldwide and up-to-date database for punching shear of FRP-RC slabs. The database includes 197 tested connections, comprising interior and edge connections, with and without shear reinforcement, and a wide range of materials and cross-sectional properties. The database was used to evaluate the accuracy of the mentioned standards in predicting the punching shear capacity. For connections without shear reinforcement, it was determined that the three design standards yielded similar performance with different conservatism levels. ACI 440.11-22 yielded the most conservative results, with average Vexp/Vpred ratios of 2.04 compared to 1.28 and 1.3 for other models. For connection with shear reinforcement, specimens with Evf> 100 GPa resulted in Vexp/Vpred ratios less than 1.0 for ACI and CSA standards.

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Section: Punching Shear Model Adopted In Aci 44011-22mentioning

confidence: 99%

Section: Assessment Of Design Provisionsmentioning

confidence: 99%

Punching Shear of FRP-RC Slab–Column Connections: A Comprehensive Database

Almomani,

Alawadi,

Tarawneh

et al. 2024

J. Compos. Sci.

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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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Flat slab‐edge column connections subjected to outward and inward eccentricity: Numerical modeling and comparison with codes

Sanabria Díaz,

de Albuquerque,

de Almeida

et al. 2024

Structural Concrete

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This study investigates the structural behavior of reinforced concrete (RC) flat slabs supported on edge columns and the influence of eccentricity direction on their punching shear strength. For this purpose, code provisions were compared based on the ultimate capacities of experimental tests reported in the literature. The comparison included the approaches provided by the current Eurocode 2, fib Model Code 2010 and the final draft of the second generation of Eurocode 2 (FprEC2). Then, a numerical investigation was conducted in which full‐scale slabs tested by Albuquerque et al. (2016) were simulated. Numerical analyses were carried out in the software Diana using a total strain‐based crack model to simulate the concrete nonlinear behavior. The input parameters for the simulations were obtained through a stochastic calibration approach to account for uncertainties related to the concrete properties. A reasonable agreement was found between the calibrated numerical models and the experimental results regarding load‐deflection curves and crack patterns. Furthermore, important differences were identified in the failure mode of edge column‐slab connections subjected to inward and outward eccentricities. Finally, additional simulations were carried out to obtain a full shear‐moment interaction diagram and investigate the shear distribution at the control perimeters around the column. The proposed method in FprEC2 exhibited a good estimation with a relatively low scatter of the punching resistance of flat slab‐edge column connections analyzed in this work.

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Flat Slabs in Eccentric Punching Shear: Experimental Database and Code Analysis

Cited by 7 publications

References 19 publications

Punching Shear of FRP-RC Slab–Column Connections: A Comprehensive Database

Punching Shear of FRP-RC Slab–Column Connections: A Comprehensive Database

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

Flat slab‐edge column connections subjected to outward and inward eccentricity: Numerical modeling and comparison with codes

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