Arch action in reinforced concrete subjected to shear

Mak, Michele Win Tai; Lees, Janet M.

doi:10.1016/j.engstruct.2022.115096

Cited by 14 publications

(18 citation statements)

References 75 publications

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“…Van den Hoogen et al [71,72] performed a numerical study on Beeby's experiment and concluded that the cut-out prevented the development of critical shear cracks, but the benefits of this geometry would be lost if the cut-out interfered with the idealised diagonal struts. Recent experimental work by Mak and Lees [16] investigated the targeted removal of material in single mix shear critical beams subjected to three-point bending and the transition from beam action to arch action. The isolation of an internal triangular arch led to significant enhancements of the structural performance.…”

Section: Shear Resistance Of Reinforced Concrete Without Transverse R...mentioning

confidence: 99%

“…2. Dimensions of the specimens: prismatic reference volume and internal triangular truss [16]. Trapezoidal volumes of 'superfluous' material obtained as the difference between the two geometries.…”

Section: Experimental Programmementioning

confidence: 99%

“…A series of four novel functionally graded reinforced concrete specimens were fabricated and tested. The results were compared to those of four specimens made of a single concrete mix from a previous study by the Authors [16], which are hereby adopted as comparators. The analysis of the results therefore refers to 8 specimens in total.…”

Section: Experimental Programmementioning

confidence: 99%

“…For the different geometries under investigation, two amounts of longitudinal reinforcement were used. The functionally graded beams were then compared with single mix (Mix A) reference beams designed to fail in shear and specimens corresponding to an isolated triangular truss [16]. These two geometries represent the upper and lower bounds of progressive substitution or removal of material.…”

Section: Specimen Geometrymentioning

confidence: 99%

“…Firstly, transverse reinforcement is often not present in certain types of bridge components, tunnels, buildings and foundations [6][7][8][9][10][11]. Secondly the shear behaviour of reinforced concrete structures is not well understood and remains at the centre of academic debate [12][13][14][15][16]. Thirdly, these shear failures are mainly governed by the properties of the concrete, rather than those of the reinforcing steel so functional grading holds promise.…”

Section: Introductionmentioning

confidence: 99%

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Carbon reduction and strength enhancement in functionally graded reinforced concrete beams

Mak

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2023

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Section: Shear Resistance Of Reinforced Concrete Without Transverse R...mentioning

confidence: 99%

Section: Experimental Programmementioning

confidence: 99%

Section: Experimental Programmementioning

confidence: 99%

Section: Specimen Geometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon reduction and strength enhancement in functionally graded reinforced concrete beams

Mak

Lees

2023

Engineering Structures

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Experimental investigation of the shear behavior of steel fiber reinforced concrete slender beams without stirrups through crack kinematics and shear transfer mechanisms

Resende

Cardoso

2023

Structural Concrete

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This paper aims to contribute to a more rational understanding of the shear strength behavior of steel fiber‐reinforced concrete beams without stirrups. For this purpose, an experimental program comprising eight slender beams varying the fiber content and type, tested in three‐point bending configuration with a complete monitoring of the displacement fields of the failure span, was carried out. A detailed analysis of the shape and kinematics of the critical crack, associated with the investigation of the shear transfer mechanisms during the test given by mechanical models available in the literature, was performed. The theoretical–experimental analyzes proved to be a promising approach for quantifying the contribution of each relevant parameter to the shear capacity, such as the fiber concrete residual tensile response. The study, therefore, presents a contribution toward a rational and comprehensive methodology for the shear design of concrete members. The influence of shape and kinematics of the critical crack on the shear response is also reported and a theoretical explanation is provided to justify the fact that beams with the same characteristics have different cracking patterns but similar shear strength.

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Capacity assessment of uncorroded and corroded dapped‐end beams by NLFE and strut‐and‐tie based methods

Belletti,

Calcavecchia,

Ferretti

et al. 2024

Structural Concrete

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The verification of dapped‐end beams degraded by corrosion is a problem, especially for existing bridges in service. This paper proposes a nonlinear finite element (NLFE) modeling procedure and a simple strut‐and‐tie based procedure for predicting the response of dapped‐end beams subjected to chloride corrosion. Firstly, the finite element modeling strategy, based on the adoption of multilayer shell elements and the PARC_CL 2.1 crack model is described. Then, the degradation effects on concrete, rebars, and steel‐to‐concrete interaction are defined as a function of the propagation period of corrosion. In particular, the effects of corrosion on the reinforcement are modeled by applying a reduction of tensile strength that considers for both the reduction of cross‐section and the ultimate strain caused by pitting. Concrete splitting cracking due to volume expansion during rust formation is modeled by reducing the mechanical properties of concrete. Corrosion effects in steel‐to‐concrete interaction are modeled by applying a bond strength decay to the spring elements connecting corroded rebars—modeled with truss elements—and concrete multilayer shell elements. The proposed finite element procedure is used to study two scenarios based on different spatial distributions of corrosion‐prone areas. Subsequently, a simplified analytical approach based on the strut‐and‐corroded tie method—called S&CT method—is proposed and compared with the finite element outcomes. Finally, the validations of the two proposed methods are presented with respect to a corroded dapped‐end beam, showing that corrosion of rebars affects the resistance mechanisms of the dapped‐end beam, by reducing both resistance and ductility. The proposed simplified analytical S&CT method provides conservative and safe results compared to the numerical NLFE model and to experimental data.

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Arch action in reinforced concrete subjected to shear

Cited by 14 publications

References 75 publications

Carbon reduction and strength enhancement in functionally graded reinforced concrete beams

Carbon reduction and strength enhancement in functionally graded reinforced concrete beams

Experimental investigation of the shear behavior of steel fiber reinforced concrete slender beams without stirrups through crack kinematics and shear transfer mechanisms

Capacity assessment of uncorroded and corroded dapped‐end beams by NLFE and strut‐and‐tie based methods

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