Verbunddübelleisten unter kombinierter Schub-Zug-Beanspruchung im gerissenen Beton/Composite dowels in cracked concrete under combined shear and tensile loads

Christou, George; Wolters, Kevin; Broschart, Yannick

doi:10.37544/0005-6650-2019-06-62

Cited by 8 publications

(6 citation statements)

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“…Furthermore, the calculation of the longitudinal shear-resistance in the current German approval does not consider the influence of concrete cracks. In past research projects [20,[22][23][24], however, a significant reduction of the load-bearing capacity was observed as a consequence of transversal cracks in the concrete slab. In building construction, transversal cracks above central supports of continuous beams, longitudinal cracks above the composite dowels from transversal bending as well as crack formation due to constraining loads in statically indeterminate systems occur.…”

Section: Generalmentioning

confidence: 94%

“…In [29], a load introduction construction with varying angles was used to carry out single-push-out tests under combined shear-and tensile-loads. This test setup was used to expand the experimental database within the research project (figure 3, [20]). The influence of the reinforcement arrangement, which had previously been identified as decisive, was systematically investigated.…”

Section: Shear-tension-resistance Of Composite Dowelsmentioning

confidence: 99%

“…Furthermore, the influence of transversal cracks was systematically investigated in pure tension-and interacting shear-tension-tests. Both the materials used and the measuring techniques are documented in detail in [20].…”

Section: Shear-tension-resistance Of Composite Dowelsmentioning

confidence: 99%

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Development of a Consistent Design Concept for Composite Dowels

et al. 2023

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Composite dowels are an economically and technically reasonable alternative to the conventional shear connectors, the headed studs. However, their competitiveness is limited by the fact that they are only approved nationally and for a limited period of time, whereas headed studs are firmly anchored in European regulations. Numerous investigations, performed on a national and international level for decades, were necessary in order to enable an integration of composite dowels into the European standards. This paper summarizes the extensive investigations on the influence of cracked concrete, of tensile and combined shear‐tensile loads as well as of composite dowel positions close to the surface on the load‐bearing behaviour of composite dowels. Based on these and former investigations, a consistent design concept for composite dowels was developed, which will also be presented within this paper and shall form the basis for the introduction into European standardization.

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Section: Generalmentioning

confidence: 94%

Section: Shear-tension-resistance Of Composite Dowelsmentioning

confidence: 99%

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Development of a Consistent Design Concept for Composite Dowels

et al. 2023

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“…In addition, an integration into the European standardization process via a so-called Technical Specification (CEN TS) is currently being sought in order to enable the use of composite dowels in building and bridge construction in the long term. In addition to the existing design concept of longitudinal shear resistance, approaches for the resistance of composite dowels in cracked concrete [3], [4], under tensile or mixed shear-tensile loads [5], [6] as well as under edge influences [7], [8] are currently being developed.…”

Section: Introductionmentioning

confidence: 99%

Crack propagation and residual load‐bearing behavior of composite dowels – effects on the global behavior of composite girders under cyclic loading

Wolters¹,

Christou²,

Feldmann³

2021

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Fatigue of a composite girder according to Eurocode 4 is carried out on the decisive shear connector. It is not taken into account that the composite girder is an internally highly statically indeterminate system in which the failure of a dowel does not necessarily lead to the failure of the girder. This applies in particular to composite dowels which are characterised by a crack propagation phase with a high residual load‐bearing capacity of a damaged dowel. In own small part and girder tests as well as numerical studies, numerous positive load‐bearing effects could be identified in composite girders with composite dowels, which increase the lifetime of the girder. In case of an initial crack in a steel dowel, followed by crack propagation, the stiffness degradation of the damaged connector leads to a redistribution of forces. The lifetime of a girder is limited by the residual capacity of the composite joint or by a global failure with increasing partial connection. A global safety concept for composite girders taking into account the crack development and residual strength of the dowels as well as the redistribution of forces within the composite joint holds an enormous economic potential. This article shows how these effects can be taken into account.

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“…As an alternative, composite dowels can be used with the rules given in a German technical approval [1]. Existing investigations under monotonic [2], [3], [4], [5], [6], [7], [8], [9], [10], [11] and cyclic loading [12], [13], [14], [15], [16] and regulations on composite dowels include various failure modes of the structure. Specifically, if the position of the composite dowels is close to the concrete surface, as to be seen in Figure 1, an additional failure mode can occur in which the concrete cover at the edge of the concrete slab spalls (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Development of a new design approach for composite dowels positioned close to the concrete surface

Broschart¹,

Kurz²,

Wolters³

et al. 2021

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Composite dowels as shear connectors between steel profiles and concrete sections have been investigated for decades. The long‐term aim is to implement a consistent design concept within Eurocode 4 ‐ covering both, the fields of bridge and building construction. Especially in building construction, where the concrete slabs are dimensioned increasingly slimmer in contrast to bridge construction, the composite dowels are positioned unavoidably close to free concrete surfaces. This causes additional failure modes, leading to the overall failure of the structure, which have not been entirely investigated yet. At University of Kaiserslautern more than 30 push‐out tests were performed within a joint research project in cooperation with RWTH Aachen University. These tests were focused on the resistance of composite dowels close to the concrete surface in dependence of varying influence parameters. Some results showed a significant reduction in shear strength and deformation capacity, mostly accompanied by the spalling of the concrete cover. Simultaneously, numerical simulations were calibrated and utilized to get a deeper understanding of the load transfer mechanisms and to interpolate between existing experimental results. On the basis of experimental measurements and numerical simulations a load transfer model was developed with a corresponding design approach to calculate the theoretical resistance.

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Verbunddübelleisten unter kombinierter Schub-Zug-Beanspruchung im gerissenen Beton/Composite dowels in cracked concrete under combined shear and tensile loads

Cited by 8 publications

References 0 publications

Development of a Consistent Design Concept for Composite Dowels

Development of a Consistent Design Concept for Composite Dowels

Crack propagation and residual load‐bearing behavior of composite dowels – effects on the global behavior of composite girders under cyclic loading

Development of a new design approach for composite dowels positioned close to the concrete surface

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