Limitations of plastic bending resistance for composite beams deviated from strain-limitation

Schäfer, Markus; Zhang, Qingjie; Braun, M. P.; Banfi, Mike

doi:10.1016/j.jcsr.2021.106562

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…By means of a simple model in a technological format proposed by Ruiz et al [72] for the non-linear calculation of structural SFRC compressive elements, the expression of R is calculated (deduced from a data base created with uniaxial compression tests on SFRC cylindrical specimens). Applying the Response Surface Methodology to a new database created with three-point flexural tests on SFRC notched prisms, values of R associated with resistant classes defined by Eurocode 2 draft (Table L.1 at Annex L) are calculated.…”

Section: Discussionmentioning

confidence: 99%

“…Disregarding the effective contribution of the fibres in compression when designing structural elements may lead to a waste of the capabilities of the material. For instance, additional ductility and toughness in compression may facilitate that steel elements in composite sections can work at their limits [71,72]. Besides, as flexural and compressive behaviours of SFRC are interconnected, it follows that proper classification of SFRC requires establishing a link between the compression and flexural strength classes, which is not done in the current normative [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Compressive behavior of steel-fiber reinforced concrete in Annex L of new Eurocode 2

Ruiz¹,

Rosa²,

Poveda³

et al. 2022

hya

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This paper describes the model for the compressive stress-strain behavior of steel fiber-reinforced concrete (SFRC) in Annex L of the new Eurocode 2 (version 2022-05, EC2), developed within CEN TC250/SC2/WG1/TG2 – Fiber reinforced concrete. The model uses functions obtained from correlations with an extensive database comprised of 197 well-documented SFRC compressive tests and 484 flexural tests. We detailedly explain the model and derive the strain values for the parabola-rectangle model for ULS of SFRC in Annex L. In addition, we also use the model and the correlations with the database to provide a link between the compressive and the flexural performance classes in EC2, which allows a complete definition of any particular SFRC. Likewise, we derive parabola-rectangle strain values for each flexural performance class, which is mainly advantageous for the stronger flexural classes. Finally, we give an example showing the enhancement in strength and ductility of a composite steel-SFRC section endorsed with the new model, which results of 15% and 100%, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compressive behavior of steel-fiber reinforced concrete in Annex L of new Eurocode 2

Ruiz¹,

Rosa²,

Poveda³

et al. 2022

hya

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“…A systematic review of strain-limited resistance for composite beam sections is given by Schäfer [9], Schäfer et al [4,10], and Zhang [11]. The described phenomenon depends on diff erent eff ects such as the position of the plastic neutral axis, material strength, and geometry of the cross-section that all impact the rotation capacity.…”

Section: Introduction and Motivation For The Studymentioning

confidence: 99%

“…to prEN1993-1-14 [8] Spannungs-Dehnungs-Diagramm für Beton nach prEN1992-1-1 [7] und für Baustahl nach prEN1993-1-14 [8] Fig. 3 Stress distribution for plastic and strain-limited resistance for a composite slim-fl oor section [10] by SL.com Spannungsverteilung basierend auf der dehnungsbegrenzten und vollplastischen Momenttragfähigkeit für den Querschnitt nach [10], berechnet mit SL.com SFRC on composite structures. As starting point has been chosen fi ller beam deck cross-sections, since this typology is well defi ned concerning its geometry as well as its application.…”

Section: Introduction and Motivation For The Studyunclassified

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Steel‐fibre reinforced concrete in composite structures as a mean to increase resistance and ductility – Outlook in a new generation of composite structures

et al. 2022

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Steel‐fibre reinforced concrete is a well‐known material used for decades for industrial floorings, shotcrete, or other specific applications. Its use is now spreading in structural applications as a complement or a substitute for conventional bar‐reinforced concrete since the normative framework is ready to provide design approaches for several concrete applications. Nevertheless, some adaptations are needed for implementing steel‐fibre reinforced concrete in the design approach for steel‐concrete composite structures whereby complementary aspects need to be considered. In this field, besides the increase of tensile properties and durability of the concrete member, a very important contribution may be given by the increase of the concrete ductility in compression. This property is conferred by the steel fibres which provide a confinement effect increasing the plastic damage that the concrete matrix can absorb. If this property is widely accepted, its benefits are limited for the design of conventional concrete sections. Conversely, for composite sections, the possibility to reach higher strains in compression means ensuring full exploitation of the strength capacity of structural steel. Besides reaching an optimisation of already in‐use cross‐sections, this new material combination enhances the use of higher structural steel strengths in composite structures.

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European Code Developments

2023

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The second generation of Eurocode 4 has been developed through several project teams that report to CEN TC250 Subcommittee 4 (CEN/TC250/SC4) ‘Design of composite steel and concrete structures’, which is chaired by Dr Graham Couchman. Given that work on the revised version of Eurocode 4 is nearing completion, this paper presents a selection of the changes that will be included, together with some of the technical challenges that needed to be overcome. Finally, further enhancements that might be considered worthy for inclusion within future editions of this standard are presented.

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Limitations of plastic bending resistance for composite beams deviated from strain-limitation

Cited by 5 publications

References 2 publications

Compressive behavior of steel-fiber reinforced concrete in Annex L of new Eurocode 2

Compressive behavior of steel-fiber reinforced concrete in Annex L of new Eurocode 2

Steel‐fibre reinforced concrete in composite structures as a mean to increase resistance and ductility – Outlook in a new generation of composite structures

European Code Developments

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