Verformungen von Stahl‐ und Spannbetonträgern mit großen Stegöffnungen

Dreßen, Tobias; Claßen, Martin

doi:10.1002/best.201300011

Cited by 11 publications

(9 citation statements)

References 5 publications

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“…Such concrete slabs can be arranged, for example, as chords of long-span floor slab systems with integrated building services [10], [11], [12], [13], [14], [15] or in slender composite constructions with high-or ultrahigh-strength concrete [16], [17], [18]. The geometry of these innovative dowels differs from the dowel geometry discussed in [6], which primarily addresses the requirements of engineering structures.…”

Section: Test Specimen Production and Materials Propertiesmentioning

confidence: 99%

Shear behaviour of composite dowels in transversely cracked concrete

Claßen

Herbrand

2015

Structural Concrete

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In steel-concrete composite girders, innovative composite dowels can be used to transfer the shear forces between the concrete slab and the steel section. Today, composite IntroductionComposite dowels are efficient, innovative shear connectors consisting of interlocking steel and concrete dowels for use in filigree composite beams (Fig. 1). The steel dowels are produced by oxygen cutting in which the cutting torch burns regular recesses into a steel plate or the web of a steel section in a continuous pass. In the composite connection, the steel dowels embedded vertically and the interstitial concrete dowels ensure an interlocking structural connection. The use of composite dowels yields very economical solutions, especially in composite sections with single-flange steel beams, since the relatively ineffective cross-sectional area of the structural steel near the plastic neutral axis is reduced [1]. Today, composite dowels are predominately used in engineering structures such as prefabricated composite bridges [2]. However, due to their ease of manufacture, excellent loadbearing and deformation properties and suitability for slender concrete slabs, these dowels are being applied more than ever in building construction as well, e.g. in integrated composite floor sys-The design of conventional shear connectors is addressed in EN 1994-1-1 [5], where approaches for determining the shear capacity of headed studs are given. EN 1994-1-1 allows for the use of alternative shear connectors other than headed studs if distinctive qualities in terms of shear and deformation behaviour are met. In conjunction with EN 1994-1-1, the design of composite dowels with puzzle-or clothoid-shaped geometry under predominantly static and cyclic loading can be carried out according to a general technical approval [6], which was certified by the DIBt in May 2013.If the concrete slab of a composite beam is exposed to tensile stresses in the longitudinal direction, transverse cracking occurs; for example, cracking can arise in the region of the interior supports of a continuous composite beam. In EN 1994-1-1, as well as in the general technical approval [6], the impact of transverse cracking on the static shear capacity of the shear connectors (headed studs as well as composite dowels) is neglected. Indeed, the effect of transverse cracks and longitudinal tension in the concrete slab on the structural behaviour of composite dowels has not yet been systematically studied. In the few known shear tests under longitudinal tension in concrete slabs [7], [8], no significant deterioration of the dowel's loadbearing capacity due to transverse cracking has been observed. In [7] it is assumed that a local pressure field in the concrete dowel resulting from the transferred dowel force leads to closure of the transverse cracks. According to [7], this crack closure yields a reduced stiffness in the shear connector, but without a significant decrease in shear capacity. However, the small database of usable experiments does not allow for a definitive asse...

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Section: Test Specimen Production and Materials Propertiesmentioning

confidence: 99%

Shear behaviour of composite dowels in transversely cracked concrete

Claßen

Herbrand

2015

Structural Concrete

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“…Baustoffbedarf, Herstellung und Rückbau von De-ckenkonstruktionen bergen ein großes Ressourceneinsparpotenzial [3]. Darüber hinaus beeinflusst die Planung der Deckenkonstruktion (Spannweite, Auflagerung, Rastermaß) die Flexibilität des Gebäudes in entscheidender Weise ( [4], [5], [6]). Insbesondere Deckenkonstruktionen in Stahl-und Stahlverbundbauweise können aufgrund ihrer filigranen Querschnitte, ihrer hohen Tragfähigkeiten und der realisierbaren Spannweiten einen wichtigen Beitrag zum Bau flexibler Geschossbauten leisten [7].…”

Section: Introductionunclassified

Integriertes Deckensystem für den Stahl‐ und Verbundbau

et al. 2018

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Im Rahmen des AiF-Forschungsvorhabens 18658 N [1] wurde das integrierte Stahl-Verbunddeckensystem InaDeck [2] hinsichtlich seiner Praxisreife weiterentwickelt. Das Deckensystem als Ausgangsbasis zeichnet sich durch große Spannweiten und die im Deckenhohlraum integrierte Gebäudetechnik aus. Im Rahmen des Forschungsprojektes wurden einerseits die einzelnen Deckenelemente hinsichtlich Tragfähigkeit, Wirtschaftlichkeit und Ressourceninanspruchnahme optimiert, andererseits wurde die Einbindung des Deckensystems in das Gesamttragwerk entwickelt. Das Tragverhalten der optimierten Deckenelemente wurde in experimentellen und theoretischen Untersuchungen erforscht. Hierbei wurden einerseits die lokalen Tragmechanismen der Verbundmittel im Stegöffnungsbereich und andererseits die Einflüsse einer kombinierten Quer-und Längsbiegebeanspruchung im Deckenelement untersucht. Zudem wurde das Schwingungsverhalten der leichten Verbunddecke analysiert. Dieser Artikel fasst die wesentlichen Ergebnisse des Forschungsvorhabens zusammen. Stichworte: Verbunddecke; Verbundträger, filigraner; Stegöffnung; Verbunddübelleiste An integrated steel composite floor slab system. Within the scope of the AiF research project 18658 N [1] the integrated composite floor slab system InaDeck [2] is developed further concerning the practical application. The floor slab system is characterized by large spans and integrated building services. In order to lead this integrated floor slab to practical suitability on the one hand the floor slab elements are optimized with regard to their structural behaviour, their economic efficiency and their resource utilization, on the other hand the integration of the slab system into the overall supporting structure of the building are developed. The structural behaviour of the optimized floor slab elements is explored in experimental and theoretical investigations.Here, on the one hand the local mechanisms of the shear connectors in the region of web openings are examined on the other hand the effects of a combined lateral and longitudinal bending stress in the slab element are tested. Moreover, the vibration behaviour of the lightweight composite slab is analysed. The article summarized the essential results of the research project.

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“…a), pry‐out failure (b) and vertical concrete splitting (c) can occur, whereas the steel dowel may fail due to combined shear and bending stresses (d) . Besides their use in building construction (), where they are mainly exposed to static loading, composite dowels are particularly prevalent in engineering structures and bridge construction (), where the cyclic traffic loads may cause fatigue processes in the composite connection. The few existing studies documented in the literature () have dealt mainly with the fatigue processes of the steel dowel, whereas the concrete fatigue behaviour has been disregarded.…”

Section: Introductionmentioning

confidence: 99%

Concrete fatigue in composite dowels

Claßen

Gallwoszus

2016

Structural Concrete

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In modern bridge construction, steel‐concrete composite structures with composite dowels are being built more than ever, especially for small and medium spans. In contrast to headed studs, in which initial steel cracks occur after only a few load cycles [1], [2], the lifetime of composite dowels is characterized by the compression of the multi‐axially stressed concrete in front of the composite dowel. Here, plastic compression strains occur in the concrete and accumulate over load cycles, leading to a cyclic increase in relative displacements in the connection. Certain proportions of these relative displacements, called inelastic slip, remain in the connection, even after the loading is relieved. The inelastic slip changes the characteristics of the static dowel curve. The initially rigid connection degrades over its lifetime, leading to redistributions of internal forces, which may be critical for fatigue design. In order to consider the degradation of the composite connection, a cyclic dowel curve can be used, which may be developed from the static dowel curve by introducing the inelastic slip. This paper presents the results of cyclic shear tests on different composite dowel geometries. The effect of load‐dependent parameters (upper load level and load range) was investigated. Furthermore, an engineering model for determining the cyclic dowel curve is presented, which was developed based on the results of experimental and numerical investigations.

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Verformungen von Stahl‐ und Spannbetonträgern mit großen Stegöffnungen

Cited by 11 publications

References 5 publications

Shear behaviour of composite dowels in transversely cracked concrete

Shear behaviour of composite dowels in transversely cracked concrete

Integriertes Deckensystem für den Stahl‐ und Verbundbau

Concrete fatigue in composite dowels

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