Theoretical prediction of the punching shear strength of concrete flat slabs under in-plane tensile forces

Fernández, Pablo García; Bernat, Antonio Ricardo Marí; Oller, Eva

doi:10.1016/j.engstruct.2020.111632

Cited by 9 publications

(7 citation statements)

References 17 publications

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“…Under axial tensile stress, the depth of the compression block is reduced, the cracks are widened, and the angle of inclination of the struts is increased, thus decreasing cotθ. Consequently, the shear strength decreases, as concluded by D. Fernandez et al [55], and Marí et al [56] for beams and by P. Fernandez et al, [57] for punching in slabs subjected to in plane tension forces. According to MASM and CCCM models the depth of the neutral axis can be estimated as:…”

Section: Does An Axial Compression Force Influence the Shear Strength...mentioning

confidence: 68%

Questions on Shear Behavior of Structural Concrete and Answers Provided by Mechanical Models. The Challenge of Performance-Based Shear Design

Bernat¹

2023

hya

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The shear behavior and strength of reinforced and prestressed concrete structures is difficult to predict due to the complex resistant mechanisms that are mobilized and the different types of failure that can occur. This has given rise to many of the simplified formulations previously developed for shear calculation being empirical in nature, which lack a clear theoretical basis and they do not provide qualitative information on structural behavior. Therefore, performance-based design becomes difficult using such types of formulations. In this paper, some questions about shear behavior and design are raised, apparently without an immediate answer from the performance point of view, and possible answers based on structural mechanics are provided. The physical phenomena that determine the shear behavior, the resistant mechanisms that are developed, the fundamental parameters that govern them, to what extent they influence and how they are contemplated in some simplified formulations are analyzed. The importance of mechanical models is raised and some examples of how these models can be naturally adapted to multiple project situations, evaluation and reinforcement of existing structures are shown.

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Section: Does An Axial Compression Force Influence the Shear Strength...mentioning

confidence: 68%

Questions on Shear Behavior of Structural Concrete and Answers Provided by Mechanical Models. The Challenge of Performance-Based Shear Design

Bernat¹

2023

hya

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“…Only slab A6 presented a cracking pattern that seems to be a transition between shear and punching‐shear failure, since the crack parallel to the support quickly turns and partially surrounds the loading plate. Negative influence of in‐plane tensile forces on the punching‐shear strength of two‐way slabs have been reported, 17,18 and this may have been the case of slab A6. However, as shown in Figure 10 and Table 6, the load‐deflection behavior and the ultimate load of this slab were in accordance with the rest of results obtained.…”

Section: Resultsmentioning

confidence: 99%

“…To conclude, within the last few years, thanks to all the research carried out, a couple of theoretical models to predict the punching-shear strength of two-way slabs subjected to in-plane uniaxial or biaxial tension have been presented. 17,18 Both models coincide in the importance of the amount of reinforcement parallel to the external tension. If the tensile stresses are high enough to cause concrete cracking, low reinforcement ratios may lead to a big loss of the punching-shear capacity caused by premature yielding of part of the reinforcement.…”

Section: Previous Research Workmentioning

confidence: 91%

“…To conclude, within the last few years, thanks to all the research carried out, a couple of theoretical models to predict the punching‐shear strength of two‐way slabs subjected to in‐plane uniaxial or biaxial tension have been presented 17,18 . Both models coincide in the importance of the amount of reinforcement parallel to the external tension.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the shear strength of one‐way reinforced concrete (RC) slabs subjected to concentrated loads and in‐plane transverse axial tension

Fernández

Bernat

Oller

2021

Structural Concrete

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This paper presents the results of an experimental campaign carried out to investigate the effects of in-plane transverse tensile forces on the shear strength of linearly supported one-way reinforced concrete (RC) slabs without shear reinforcement subjected to concentrated loads. A total of 5 half scale slabs (1650 Â 1650 Â 120 mm), subjected simultaneously to different levels of in-plane tensile forces and a concentrated load were tested up to failure. The clear shear span to effective depth ratio a v /d was equal to 3 in all tests, to minimize the effects of the direct transmission of the load to the closest support, the so called arching action.As observed, the shear strength barely decreases with increasing values of the tensile force applied, even for values of the external force that cracked the concrete cross-section of the slabs in the direction perpendicular to the span. These observations may indicate that the shear-flexural behavior in the spanning direction is not significantly affected by the membrane forces in the transverse direction.

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“…The theoretical formula is related to the tensile strength of the concrete retaining wall, and the Kalmykov formula and the traditional theoretical formula are related to the compressive strength of the concrete retaining wall. From the literature [30], we can take σ = 10S t .…”

Section: Relationship Between Thickness Of Concrete Retaining Wall An...mentioning

confidence: 99%

A Method for Determining the Safe Thickness of Concrete Retaining Walls Based on Slab Structure Theory

Liu

Chen

et al. 2022

Applied Sciences

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The safe thickness of concrete retaining walls for curtain grouting on tunnel faces is an essential factor related to tunnel safety and grouting effects. In this research, the concrete retaining wall was simplified into a standard rectangular slab structure. The Rankine active earth pressure theory and the plastic hinge theory were used to analyze the lateral force of the concrete retaining wall. By deriving the safety-thickness equation of the concrete retaining wall, a quantitative criterion that can display the mechanism of the concrete retaining wall was obtained. The traditional empirical formula and Kalmykov formula had a particular connection with the method in this paper in determining the safe thickness of the concrete retaining wall. This was negatively related to the compressive (tensile) strength of the concrete and the groundwater level and positively associated with the buried depth of the tunnel. The conversion relationship between the traditional empirical formula and the theoretical formula was established, and the exact solution formula for the value of safety coefficient K0 was given. Finally, the rationality of the theoretical formula was verified by a field test, in novel work that provides a reference for similar projects.

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Theoretical prediction of the punching shear strength of concrete flat slabs under in-plane tensile forces

Cited by 9 publications

References 17 publications

Questions on Shear Behavior of Structural Concrete and Answers Provided by Mechanical Models. The Challenge of Performance-Based Shear Design

Questions on Shear Behavior of Structural Concrete and Answers Provided by Mechanical Models. The Challenge of Performance-Based Shear Design

Experimental investigation of the shear strength of one‐way reinforced concrete (RC) slabs subjected to concentrated loads and in‐plane transverse axial tension

A Method for Determining the Safe Thickness of Concrete Retaining Walls Based on Slab Structure Theory

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