Steel-fibre reinforced concrete in compo-site structures as a mean to increase re-sistance and ductility

in Stahlbau (2022), 91(12), 801-811

Steel-fibre reinforced concrete is a well-known material used for decades for industrial floorings, shot-crete, or other specific applications. Its use is now spreading in structural applications as a ... [more ▼]

Steel-fibre reinforced concrete is a well-known material used for decades for industrial floorings, shot-crete, 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 struc-tures 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 in-crease of the concrete ductility in compression. This property is conferred by the steel fibres which pro-vide a confinement effect increasing the plastic damage that the concrete matrix can absorb. If this prop-erty is widely accepted, its benefits are limited for the design of conventional concrete sections. Con-versely, 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 optimization of already in-use cross-sections, this new material combination enhances the use of higher structural steel strengths in composite structures. [less ▲]

Rotation capacity of composite joints for slim-floor beams

in Stahlbau (2019), 88(7), 675--684

The analysis of a composite beam-to-column structure requires knowledge about, on the one hand, the behaviour of beams and columns and, on the other, the joints between such elements. For beam-to-column ... [more ▼]

The analysis of a composite beam-to-column structure requires knowledge about, on the one hand, the behaviour of beams and columns and, on the other, the joints between such elements. For beam-to-column joints, for example, the lack of appropriate design rules forces structural engineers to model joints as pinned, despite the fact that a certain joint rigidity and bending resistance is available because of the upper reinforced concrete slab. In this context, a research program with experimental and numerical investigations was initiated at the University of Luxembourg [1]. This aim of this research was to identify the influence of two major joint components – the reinforced concrete slab and the steelwork connection – on the behaviour of composite joints under a hogging bending moment. Eight experimental tests were performed on... [less ▲]

Chancen und Herausforderungen für Stahl-Verbundkonstruktionen im modernen Geschossbau

in Stahlbau (2019), 88(7),

Aus dem Trend der Urbanisierung und dem Anstieg von Investitionen in den Wirtschaftszentren Europas resultiert ein rasantes Wachstum. Damit einher geht eine immense Nachfrage nach entsprechenden ... [more ▼]

Aus dem Trend der Urbanisierung und dem Anstieg von Investitionen in den Wirtschaftszentren Europas resultiert ein rasantes Wachstum. Damit einher geht eine immense Nachfrage nach entsprechenden Nutzflächen sowie der zugehörigen Infrastruktur. In den großen Ballungsgebieten, den Hotspots der Wirtschaft, wird der Bedarf an Mehrgeschossbauten und Hochhäusern stark ansteigen.Dabei stellen sich neue Herausforderungen. Die Bauindustrie muss sich mit zukunftsorientierten Bauweisen unter Einbeziehung des Klimaschutzes und insbesondere der Ressourceneffizienz ernsthaft auseinandersetzen und neue Ansätze jenseits traditioneller Bauweisen finden. Da ca. 33 % des gesamten Rohstoffverbrauchs mit der Bauwirtschaft verbunden sind, müssen nachhaltige, effiziente und marktfähige Bautechnologien in den Fokus gerückt werden. Darüber hinaus gewinnt die Optimierung der Baustellenorganisation und Logistik sowie industrieller Vorfertigung vermehrt an Bedeutung... [less ▲]

Entwicklung der Slim-Floor-Bauweise in Europa

in Stahlbau (2019), 88(2019)(7),

Slim-floor or also called shallow floor construction represents innovative composite beam systems for multi-storey buildings. These are rolled or welded steel profiles fully or partially integrated into ... [more ▼]

Slim-floor or also called shallow floor construction represents innovative composite beam systems for multi-storey buildings. These are rolled or welded steel profiles fully or partially integrated into the concrete slab. This construction method constitutes one of the most recent developments in steel-concrete composite construction and has become increasingly important in the last two decades. In this article, the construction method is explained as well as its development. [less ▲]

Symbiose aus Stahl und Stein

in Stahlbau (2016), Stahlbau 85(Heft 10), 659-669

The real estate project KONS encountered a two and a half year process of demolition of an existing building and construction of a new building complex in a central, urban location of Luxembourg City ... [more ▼]

The real estate project KONS encountered a two and a half year process of demolition of an existing building and construction of a new building complex in a central, urban location of Luxembourg City opposite of the main railway station. Thereby the ambitious specifications of the investor as well as the requirements of the local authorities could be met only through a comprehensive and intelligent planning process. The complex interrelation between logistics and construction management processes, detailing and overall economic assessment found the solution of steel-composite design highly performant and efficient in every aspect. [less ▲]

Schubtragfähigkeit und M-V Interaktion von Flachdecken mit integrierten hohlkastenförmigen Stahlprofilen - Ansatz eines hybriden Fachwerkmodells zur Querkraftbemessung

in Stahlbau (2015), 84. Jahrgang(Heft 4), 314-323

Shear resistance and M-V-Interaction of Slim-Floor-systems with integrated steel-box sections - Approach of a hybrid truss model for the shear design. Shallow-floor slabs with integrated steel profiles in ... [more ▼]

Shear resistance and M-V-Interaction of Slim-Floor-systems with integrated steel-box sections - Approach of a hybrid truss model for the shear design. Shallow-floor slabs with integrated steel profiles in composite behavior are mainly characterized by the slim design. Parallel to the traditional sections consisting of rolled profiles with an additional bottom plate also floor-slabs with integrated steel-box sections have gained widespread adoption in practice in the recent years. Because of the sheathing of the concrete by the steel section a hybrid truss model with a compression strut in the concrete section is developed, increasing the shear resistance of these sections. Due to the additional steel stresses resulting by the truss model, the relationship for the interaction between moment and vertical shear forces is to expand. [less ▲]

Zur Biegebemessung von Flachdecken in Verbundbauweise - Ergänzende Bemessungsregeln für Slim-Floor-Träger

in Stahlbau (2015), Jahrgang 84(Heft 4), 231-238

Due to the demand for sustainable buildings and slim constructions, composite slim-floor systems become more important. The present European Codes do not include complete design rules for shallow-floor ... [more ▼]

Due to the demand for sustainable buildings and slim constructions, composite slim-floor systems become more important. The present European Codes do not include complete design rules for shallow-floor beams. In the design, additional regulations have to be considered for ultimate limit state, serviceability limit state and fire design. In this paper the characteristics in erection state, for the cross section classification, the plastic moment resistance and the influence of transverse bending moments are presented. Apart from traditional sections consisting of rolled profiles also floor slabs with integrated steel box-sections have been considered. [less ▲]

Parking Belval-Université

in Stahlbau (2014), Stahlbau 83(Heft 3), 149-157

Transport policy in Luxembourg provides the realization of a dense network of public transport. Motorists, especially the large number of commuters from the neighbor countries, should already change close ... [more ▼]

Transport policy in Luxembourg provides the realization of a dense network of public transport. Motorists, especially the large number of commuters from the neighbor countries, should already change close to the borders to public traffic – especially to train. By that it is possible to relieve the national highways and also those in bordering regions. With the start into service of the new multi-storey car park Belval-Université in 2013, the first of a series of planned Park & Rail projects is realized. It is the most modern car park in Luxembourg and complies with high standards in architecture and traffic management systems. Together with the immediately adjacent train station, an intermodal platform with excellent transport links to the international financial center of Luxembourg City is created. [less ▲]

Untersuchungen über das Trag-und Dehnungsverhalten des Betongurtes bei Verbundanschlüssen

in Stahlbau (2009), 78(1), 35-41

Due to the rising cost pressures in the construction industry, it is particularly important to choose efficient design methods to achieve economic structures. The use of the plastic hinge theory may lead ... [more ▼]

Due to the rising cost pressures in the construction industry, it is particularly important to choose efficient design methods to achieve economic structures. The use of the plastic hinge theory may lead to good results within the steel and composite construction industry because cross section- and system reserves can almost fully used. This means for the normal composite beam a redistribution of the bending moment from the support section to the field section. This redistribution causes an increase of the rotation at the composite connection. The presented tests show the influence of the reinforcement (type of reinforcement and reinforcement ratio) to the rotation capacity of the connection. The increased rotation requirements of composite connections in the area of plastic hinges should already be take in to account at planning state. [less ▲]

Rechenbeispiel zum Statischen Nachweis von Verbundträgern mit verformbaren, teiltragfähigen Verbundanschlüssen

in Stahlbau (2005), 74(2), 134--141

Im Artikel „Zur Berücksichtigung von verformbaren, teiltragfähigen Verbundanschlüssen bei der Berechnung von Verbundträgern“ wurde ein Modell vorgestellt, welches es ermöglicht, aus versuchsgestützten ... [more ▼]

Im Artikel „Zur Berücksichtigung von verformbaren, teiltragfähigen Verbundanschlüssen bei der Berechnung von Verbundträgern“ wurde ein Modell vorgestellt, welches es ermöglicht, aus versuchsgestützten Daten eine bilineare Anschlusskurve für Verbundanschlüsse mit einer biegeweichen, teiltragfähigen Charakteristik zu ermitteln... [less ▲]