Besondere Aspekte bei der Verwendung von Gitterträger‐Elementdecken zur Herstellung punktgestützter Flachdecken

Held, Markus; Welsch, Torsten

doi:10.1002/bate.201110024

Cited by 3 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the advantages in the ultima limit state are almost not applied at all, even though international research has been pe formed [21][22][23][24]. Much of the research for the ultimate limit state was conducted in Ge many (e.g., [1,[25][26][27]), where the design of semi-precast slabs with lattice girders follow technical approvals, which are based on Eurocode 2 [28] in combination with the Nation Annex of Germany [29]. In the ultimate limit state, lattice girders are used as shear, inte face shear, and punching shear reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Interface Shear Fatigue of Semi-Precast Slabs with Lattice Girders

et al. 2021

View full text Add to dashboard Cite

Due to their high cost efficiency and flexibility, semi-precast concrete slabs with lattice girders are widely used in constructions all over the world. Prefabricated concrete slabs, combined with in situ concrete topping, exhibit a quasi-monolithic structural behavior in which lattice girders serve as vertical shear reinforcement and ensure the transfer of longitudinal shear within the interface, acting in combination with concrete-to-concrete bonding mechanisms. To be applicable in industrial and bridge construction, semi-precast slabs need to have sufficient resistance against fatigue failure. To improve and expand the limits of application, theoretical and experimental investigations are conducted at the Institute of Structural Concrete (IMB), RWTH Aachen University. To investigate the fatigue behavior of lattice girders, small size tests with lattice girder diagonals were carried out. These test results have been used to derive an S–N curve (S: stress, N: number of load cycles) for lattice girders for a more refined fatigue design. Subsequently, the fatigue behavior of semi-precast slabs with lattice girders was investigated by fatigue tests on single-span slab segments. The fatigue design regulations of lattice girders according to technical approvals can generally be confirmed by this test program; however, they tend to be conservative. The use of the derived S–N curve leads to significantly improved agreement of fatigue behavior observed in tests and design expressions.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigations on Interface Shear Fatigue of Semi-Precast Slabs with Lattice Girders

et al. 2021

View full text Add to dashboard Cite

show abstract

Zur konstruktiven Durchbildung des Decke‐Stütze‐Knotens in Flachdecken aus Elementplatten

et al. 2016

View full text Add to dashboard Cite

Aufgrund des hohen Vorfertigungsgrads gewinnen Elementplatten auch in Flachdecken zunehmend an Bedeutung. Wegen der hohen Querkraft‐ und Momentenbeanspruchung im Bereich des Decke‐Stütze‐Knotens ist dessen konstruktive Durchbildung von sicherheitsrelevanter Bedeutung. In der Praxis wird der Abstand der Elementplatten zur Stütze unterschiedlich ausgeführt. In Anlehnung an die in Zulassungen von verschiedenen Durchstanzbewehrungssystemen geforderte Mindestbreite der Fuge zwischen den Elementplatten von 4 cm wird auch der Abstand zwischen Elementplatte und Stützenanschnitt teilweise so groß gewählt. Eine solche Bauausführung hat den Vorteil, dass Abmessungs‐ und Lagetoleranzen ausgeglichen werden können. Nachteilig ist jedoch die zusätzlich erforderliche Abschalung der Fuge nach unten. Daher wird in der Praxis ein Heranführen der Elementplatte bis direkt an die Stütze bevorzugt.Anhand einer systematischen Versuchsserie mit speziellen Gitterträgern als Durchstanzbewehrung wurde zwischenzeitlich nachgewiesen, dass kleinere Abstände zwischen Elementplatte und Stütze die Durchstanztragfähigkeit nicht abmindern. Zur Bestätigung dieses Zusammenhangs auch für andere Durchstanzbewehrungssysteme wurden am Institut für Massivbau der RWTH Aachen zwei Durchstanzversuche mit Doppelkopfankern und speziellen Gitterträgern als Durchstanzbewehrung durchgeführt. Die Elementplatten wurden direkt bis an die Stützenkante geführt. Um Montageungenauigkeiten zu berücksichtigen, wurden die vorgefertigten Stützen zusätzlich zu hoch betoniert. Der Vergleich der Versuchsergebnisse mit denen jeweiliger Referenzversuche erlaubt Empfehlungen zur konstruktiven Durchbildung des Decke‐Stütze‐Knotens bei der Verwendung von Elementplatten in Flachdecken.Construction of slab‐column‐connections in semi‐precast flat slabsDue to the high degree of prefabrication, semi‐precast flat slabs are gaining importance. In this context, the construction of the slab‐column‐connection has a safety‐related significance. In daily engineering practice, the joint widths between semi‐precast slabs as well as the joint widths between semi‐precast slabs and the column's vicinity is constructed differently. The European Technical Approvals of different punching shear reinforcement systems limit the minimum joint width between semi‐precast elements to 4 cm. Following these provisions, the joint widths between semi‐precast slabs and the column's vicinity is constructed with 4 cm in some cases. An advantage of this approach is the possibility to adjust dimensional and positional tolerances at construction site. However, a disadvantage is the additional formwork for the joint from the soffit.A systematic test series with special lattice girders as punching shear reinforcement showed no reduction of the punching shear resistance for smaller joint widths between semi‐precast slabs and the column's vicinity. To confirm these test results, two punching shear tests with double headed studs and lattice girders as punching shear reinforcement were conducted at Institute of Structural Concrete (RWTH Aachen). In the tests, the influence of the joint width between semi‐precast slabs and the column's vicinity as well as the influence of column height tolerances were investigated. Based on the results of the tests, this article gives recommendations for the construction of slab‐column‐connections in semi‐precast flat slabs.

show abstract

Zur Geschichte der Stahlbetonflachdecke

Welsch

Held

2012

Beton und Stahlbetonbau

View full text Add to dashboard Cite

show abstract

Besondere Aspekte bei der Verwendung von Gitterträger‐Elementdecken zur Herstellung punktgestützter Flachdecken

Cited by 3 publications

References 1 publication

Investigations on Interface Shear Fatigue of Semi-Precast Slabs with Lattice Girders

Investigations on Interface Shear Fatigue of Semi-Precast Slabs with Lattice Girders

Zur konstruktiven Durchbildung des Decke‐Stütze‐Knotens in Flachdecken aus Elementplatten

Zur Geschichte der Stahlbetonflachdecke

Contact Info

Product

Resources

About