Durchstanzen bei Ermüdungsbeanspruchung

Furche, Johannes; Bauermeister, Ulrich; Kummerow, Andreas

doi:10.1002/best.201900012

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…For fatigue design, S-Ncurves for different lattice girder types have been developed. 4,5 However, more investigations are still missing for the improvement of the design concept since the current design approach for shear fatigue leads to high shear reinforcement ratios and thus to uneconomical results. To analyze the behavior under cyclic loading, initially, a closer look at the structural behavior of semi-precast slabs under monotonic loading is necessary.…”

Section: Introductionmentioning

confidence: 99%

“…Semi‐precast slabs can generally be used for both monotonic and cyclic loading. For fatigue design, S ‐ N ‐curves for different lattice girder types have been developed 4,5 . However, more investigations are still missing for the improvement of the design concept since the current design approach for shear fatigue leads to high shear reinforcement ratios and thus to uneconomical results.…”

Section: Introductionmentioning

confidence: 99%

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Shear and interface shear of semi‐precast slabs with lattice girders under monotonic loading

Hegger

2023

Structural Concrete

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Semi-precast slabs, where lattice girders serve both as reinforcement in the construction and in the final state, are characterized by a high flexibility and cost efficiency. Due to their technical and economic advantages, they are widely employed in constructions all over the world. In Germany, for example, they are used in about 70% of all floor slabs. To address this economic potential and to improve the design concept for shear and interface shear, theoretical and experimental investigations were conducted at the Institute of Structural Concrete (IMB), RWTH Aachen University. In addition to presenting the general structural behavior of the 16 tests, particular attention is paid to the increase in shear and interface shear resistance at the inner support of continuous slabs and the positive influences of the investigated support detail. The findings illustrate further potential for optimization under monotonic loading, which will also have a positive effect on the fatigue behavior under cyclic loading.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shear and interface shear of semi‐precast slabs with lattice girders under monotonic loading

Hegger

2023

Structural Concrete

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“…Since the first semi-precast slabs with l tice girders were built in the 1960s, this construction method has been continuously d veloped and researched. In recent years, punching and fatigue design have been the ma areas of research for the use of lattice girders [30][31][32][33][34][35][36][37]. The S-N curves (S: stress, N: numb of load cycles) defined in [29] for profiled bars, which are either bent or welded, are n applicable for the fatigue design of lattice girders.…”

Section: Introductionmentioning

confidence: 99%

“…In order to extend the range of application by deriving S-N curves for lattice girders, small-size fatigue tests with lattice girder diagonals cast in concrete cubes have been conducted at the Institute of Structural Concrete (IMB), RWTH Aachen [43,56], using the procedure of the interactive method [57,58] (Figure 5b). This procedure had also been adapted to derive S-N curves for other lattice girder systems, e.g., in [36].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Ermüdungsnachweis für Elementdecken mit Gitterträgern

Furche¹,

Bauermeister²

2019

Beton und Stahlbetonbau

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Elementdecken aus vorgefertigten Stahlbetonplatten mit Gitterträgern und aufbetonierter Ortbetonschicht werden seit Jahren auch bei nicht vorwiegend ruhender Beanspruchung eingesetzt [1]. Die Anwendungs‐ und Bemessungsregeln hierzu wurden auf der Grundlage von Bauteilversuchen festgelegt. Erste ermüdungsbeanspruchte Verbundbauteile mit horizontaler Verbundfuge überstanden als Prüfkriterium zwei Millionen Lastwechsel ohne Versagen. Das Bemessungskonzept wurde für diese Lastwechselzahl formuliert. Inzwischen wurden sowohl Ermüdungsversuche an Elementdecken mit größerer Lastwechselzahl durchgeführt als auch Wöhlerlinien für Gitterträger als Verbundbewehrung und Schubbewehrung ermittelt. Das Bemessungskonzept in der allgemeinen bauaufsichtlichen Zulassung für Gitterträger wurde daher an das Bemessungskonzept des Eurocodes für Stahlbetonbauteile angepasst. Auf der Grundlage der neuen Zulassung lässt sich der Ermüdungswiderstand sowohl über einen Betriebsfestigkeitsnachweis als auch über eine äquivalente Spannungsschwingbreite nachweisen.

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Durchstanzen bei Ermüdungsbeanspruchung

Cited by 4 publications

References 3 publications

Shear and interface shear of semi‐precast slabs with lattice girders under monotonic loading

Shear and interface shear of semi‐precast slabs with lattice girders under monotonic loading

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

Ermüdungsnachweis für Elementdecken mit Gitterträgern

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