Ultimate Strength and Design of Reinforced Concrete Beams under Bending and Shear

Grob, Josef; Thürlimann, Bruno

doi:10.1007/978-3-0348-5337-8_1

Cited by 10 publications

(10 citation statements)

References 5 publications

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“…The problem of shear in reinforced concrete was extensively studied for about a century [1] and it was suggested [1,2] that the extension of plasticity theory would be one of the most important advances in understanding shear in reinforced concrete. The plastic theory was first applied to shear in reinforced concrete structures by research groups in Denmark [3] and Zurich [4]. Design philosophy for shear in reinforced concrete beams using plasticity theory comprises two branches: the truss analogy and the kinematic approach.…”

Section: Introductionmentioning

confidence: 99%

Application of plasticity theory to reinforced concrete deep beams: a review

Ashour

Yang

2008

Magazine of Concrete Research

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This paper reviews the application of the plasticity theory to reinforced concrete deep beams. Both the truss analogy and mechanism approach were employed to predict the capacity of reinforced concrete deep beams. In addition, most current codes of practice, for example Eurocode 1992 and ACI 318-05, recommend the strut-and-tie model for designing reinforced concrete deep beams. Compared with methods based on empirical or semi-empirical equations, the strut-and-tie model and mechanism analyses are more rational, adequately accurate and sufficiently simple for estimating the load capacity of reinforced concrete deep beams. However, there is a problem of selecting the effectiveness factor of concrete as reflected in the wide range of values reported in the literature for deep beams.

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Section: Introductionmentioning

confidence: 99%

Application of plasticity theory to reinforced concrete deep beams: a review

Ashour

Yang

2008

Magazine of Concrete Research

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“…A refined approach based on a MTA is the Modified Compression Field Theory, 36,37 which considers also the potential sliding along cracks (disengagement of aggregate interlock 38 ). An alternative approach to the MTA are the variable truss angle (VTA) models, 7,8,39,40 based on the limit analysis. In the VTA approach, the inclination of the compression field (θ σ in Figure 2b) is directly selected by the designer to determine the required amount of shear reinforcement.…”

mentioning

confidence: 99%

Influence of amount of shear reinforcement and its post‐yield response on the shear resistance of reinforced concrete members

Monney

Ruiz

Muttoni

2022

Structural Concrete

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The minimum amount of shear reinforcement to be provided in reinforced concrete members has been a topic of debate and research for decades without reaching a consensus. Defining such values is however instrumental to build in an economic manner and to safely ensure the applicability of the models used for design or assessment. This paper presents the results of an investigation addressed at the activation and contribution of shear reinforcement to the resistance, particularly when low amounts are arranged. The research comprises an experimental part, where 10 tests are performed on full-scale beams with varying amounts of shear reinforcement and different mechanical properties of the reinforcement. The tests were instrumented with refined measurement techniques such as digital image correlation and fiber-optic measurements, allowing for a detailed tracking of the strains in the concrete and the reinforcement. The results of the program clearly show that the transition from strain localization with a single shear crack to distributed cracking is influenced by both the ratio of shear reinforcement and its post-yield response. The results are confirmed by the analysis of a comprehensive database of 236 specimens collected from the literature, where the influence of the different parameters is analyzed. Finally, it is discussed how such findings can be implemented into codes of practice, explaining the recent changes introduced in prEN 1992-1-1:2021 (draft for the 2nd generation of Eurocode 2) and fib MC2020.

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“…8 In the presence of transverse reinforcement, the angle between the struts and the ties can be reduced, but it is suggested not to reduce the angles below 20 to 25 degrees. This limit is grounded 26 on the fact that, otherwise, the state of strains of the member become rather incompatible (with tension in the reinforcement and compression strains in the concrete developing at a low angle) requiring large tensile strains as well as crack widths to develop, which potentially reduces the value of coefficient η ε below the conventional thresholds (0.6 in this case). This is the reason why, for flat angles of the compression field, analyses based on elastic-plastic material properties accounting for cracking lead to more accurate results.…”

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confidence: 99%