Neuauflage DAfStb‐Richtlinie Stahlfaserbeton

Mark, Peter; Oettel, Vincent; Look, Katharina; Empelmann, Martin

doi:10.1002/best.202000065

Cited by 13 publications

(11 citation statements)

References 17 publications

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“…The modified approach can also be used for analyses and investigations of components reinforced with steel fibers in order to develop new design models or to further develop existing models (e.g., References 20–24). In older literature reporting on structural tests with steel fiber‐reinforced concrete, there is often insufficient or no information on the postcrack flexural tensile strength of the steel fiber‐reinforced concrete used.…”

Section: Discussionmentioning

confidence: 99%

Empirical approach for the residual flexural tensile strength of steel fiber‐reinforced concrete based on notched three‐point bending tests

Oettel

Schulz²,

Haist

2022

Structural Concrete

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When designing steel fiber-reinforced concrete, for example, according to Model Code 2010, the residual flexural strength values must be specified as fundamental properties. It is often difficult to establish the relationship between residual flexural strength values and the required dosage of steel fibers depending on the type of steel fibers and the concrete quality. For an estimation of the presumably necessary dosage of steel fibers, various empirical approaches exist for the approximate determination of the residual flexural strength values, which, however, are based on different tests and have been almost exclusively been derived on the basis of few or "own" test results of the respective institute. For this reason, the validity of the respective approximation approach is often limited. Using the bending beam database "Steel Fibre Reinforced Concrete", selected approaches were systematically analyzed and an improved approach for determining the residual flexural strength values of steel fiber-reinforced concrete was developed.

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Section: Discussionmentioning

confidence: 99%

Empirical approach for the residual flexural tensile strength of steel fiber‐reinforced concrete based on notched three‐point bending tests

Oettel

Schulz²,

Haist

2022

Structural Concrete

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“…Moreover, the respective design standardization framework is expanding, which is reflected in the current fib Model Code 2010 1 and the upcoming fib Model Code 2020, 2 the DAfStb "Richtlinie für Stahlfaserbeton" 3 with its most recent amendment 4 and, perhaps most importantly, in the inclusion of design provisions for SFRC in the upcoming edition of Eurocode-2. 5 The overall improvement of concrete load-bearing capacity for anchors with the inclusion of steel fiber reinforcement has been established in a series of publications for various SFRC recipes and different anchorage situations, such as for ultra-high strength concrete, 6,7 for large-sized anchors, 8 and for cast-in anchorage systems.…”

Section: Introductionmentioning

confidence: 99%

Hybrid assessment of fiber orientation influence on the load resistance of anchors in SFRC

Mellios,

Losse,

Spyridis

2023

Civil Engineering Design

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The consistent evolution of concrete has led to a variety of concrete types that enhance the material's versatility, cost‐efficiency and sustainability. Despite the rapid development and extensive research regarding steel fibre reinforced concrete (SFRC) in the last decades, there are still knowledge gaps on the material's resistance against locally applied tension loads on anchor bolts, as well as the interaction of possible non‐homogenous fibre orientations on the anchorage axisymmetric stress field. This aspect becomes particularly relevant since anchors are placed at the component boundaries, where fibres tend to align parallel to the external surface. Through an innovative experimental investigation on 64 single bonded anchors using layer‐casting concrete and a supporting set of non‐linear finite element simulations, this work aspires to exhibit the influence of controlled unidimensional fibre orientation on the load‐bearing capacity and behaviour of anchorages in SFRC.This article is protected by copyright. All rights reserved.

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“…Because of the increasing trend for the use of SFRC in several types of engineering structures, advanced knowledge and standardisation with respect to this material becomes essential. The increasing interest in design guidance for SFRC is reflected in, besides numerous scientific publications and dedicated conferences, the emerging guidelines and standards, e.g., in the fib Model Code 2010 and 2020 [2,3], the German standard DIN 1045 and the associated DAfStb-Richtlinie Stahlfaserbeton [4], the ACI 544.4 Guide to Design with Fiber-Reinforced Concrete [5] and, most importantly, in the inclusion of provisions for the design with SFRC in the next generation of Eurocode 2 [6]. The design with SFRC strongly depends on the properties of the fiber reinforcement, such as the dosage of the fibers (typically expressed in weight of fibers per total volume of concrete), the material (steel, natural, synthetic), the dimensions (length and cross-section) and the shape of the fibers (straight, crimped, hooked, etc.)…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Multi-Method Assessment of Steel Fiber Orientation in Concrete

et al. 2022

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Integration of fiber reinforcement in high-performance cementitious materials has become widely applied in many fields of construction. One of the most investigated advantages of steel fiber reinforced concrete (SFRC) is the deceleration of crack growth and hence its improved sustainability. Additional benefits are associated with its structural properties, as fibers can significantly increase the ductility and the tensile strength of concrete. In some applications it is even possible to entirely replace the conventional reinforcement, leading to significant logistical and environmental benefits. Fiber reinforcement can, however, have critical disadvantages and even hinder the performance of concrete, since it can induce an anisotropic material behavior of the mixture if the fibers are not appropriately oriented. For a safe use of SFRC in the future, reliable non-destructive testing (NDT) methods need to be identified to assess the fibers’ orientation in hardened concrete. In this study, ultrasonic material testing, electrical impedance testing, and X-ray computed tomography have been investigated for this purpose using specially produced samples with biased or random fiber orientations. We demonstrate the capabilities of each of these NDT techniques for fiber orientation measurements and draw conclusions based on these results about the most promising areas for future research and development.

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Neuauflage DAfStb‐Richtlinie Stahlfaserbeton

Cited by 13 publications

References 17 publications

Empirical approach for the residual flexural tensile strength of steel fiber‐reinforced concrete based on notched three‐point bending tests

Empirical approach for the residual flexural tensile strength of steel fiber‐reinforced concrete based on notched three‐point bending tests

Hybrid assessment of fiber orientation influence on the load resistance of anchors in SFRC

Non-Destructive Multi-Method Assessment of Steel Fiber Orientation in Concrete

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