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

Schmidt, Maximilian; Wieneke, Katrin; Claßen, Martin; Hegger, Josef

doi:10.3390/app112311196

Cited by 16 publications

(19 citation statements)

References 51 publications

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“…The positive influence of a reduced shear slenderness for continuous members compared to single-span members is not taken into account in current design concepts for semi-precast slabs [6][7][8][9] which usually have small and medium shear reinforcement ratios. The experimental investigations are an extension to the investigations of Hillebrand et al and Hegger and Wieneke, 5,25 where the fatigue behavior of small size tests and slab specimens was investigated. For the small size tests the welded nodes as a critical part of the lattice girder diagonal were cast in concrete cubes (Figure 3a).…”

Section: Shear Slendernessmentioning

confidence: 99%

“…The effectiveness of this work step was already demonstrated in the previous project. 5,25 For each prefabricated slab, the mean roughness depth R t was measured using the sand patch method according to Kaufmann, 28 which is the standard procedure for this case. Since this method is very userdependent and sometimes provides scattering results, an additional measurement was conducted using laser technology.…”

Section: Production Of the Test Specimensmentioning

confidence: 99%

“…Since a greased surface can no longer be measured properly, the surface was defined as very smooth for slabs EG19a and EG19b according to the test results of Hillebrand et al and Hegger and Wieneke. 5,25 Their roughness given in Figure 8a was measured before the grease was applied. An example of the roughened surface can be seen in Figure 8b.…”

Section: Production Of the Test Specimensmentioning

confidence: 99%

“…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%

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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: Shear Slendernessmentioning

confidence: 99%

Section: Production Of the Test Specimensmentioning

confidence: 99%

Section: Production Of the Test Specimensmentioning

confidence: 99%

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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“…Accurate prediction of fatigue life of concrete structures remains an unsolved issue that increasingly attracts the attention of the research community [1][2][3][4]. Deeper understanding of concrete fatigue is urgently needed to address the ecological and sociological challenge of the next decade, namely the trade-off between the high carbon footprint associated with the concrete construction sector on the one hand, and a world-wide increasing demand for transportation and energy infrastructure made of concrete on the other hand.…”

Section: Introductionmentioning

confidence: 99%

On the energy dissipation in confined concrete subjected to shear cyclic loading

Aguilar

Baktheer

Chudoba

2023

Proc Appl Math and Mech

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The establishment of a simple engineering rule for predicting the fatigue failure of concrete has been pursued over the past decades. An energetic approach to the matter seems to be an attractive option that many researchers have embraced. In the present work, the authors attempt to contribute to the establishment of such a rule. In particular, the energy dissipation of confined concrete subjected to shear cyclic loading is studied and quantified. For this purpose, a microplane fatigue model recently introduced by the authors, referred to as MS1, is used. It aims to capture the fundamental inelastic mechanisms driving the tri-axial stress redistribution within a material zone during the fatigue damage process in concrete. To this end, the fatigue damage evolution is linked to a measure of cumulative inelastic shear strain at the microplane level, reflecting the accumulation of fatigue damage due to internal shear/sliding between aggregates at subcritical pulsating load levels. To isolate the dissipative mechanism mentioned above, test configurations with dominant shear stress seem to be more appropriate. In the present work, a punch-through shear test (PTST) FE model is used to induce shear-dominated stresses and strains along the ligament of a specimen. Numerical studies are first presented to evaluate the behavior and energy dissipation at the elemental interface level. The interface is introduced in the MS1 microplane material model, which is capable of reproducing the concrete behavior under monotonic, cyclic, and fatigue loading with consistent set of material parameters. Quantification of the energy dissipation for each introduced dissipative mechanism is performed at each microplane and integrated via a well-established homogenization scheme to evaluate the macroscopic energy dissipation. Later, an analysis of the energy dissipation of the PTST process zone is performed for cyclic loading under two different subcritical cyclic load amplitudes.

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Neue Perspektiven auf das Querkrafttragverhalten von Stahlbetonbauteilen ohne Querkraftbewehrung

Schmidt,

Seemab,

Chudoba

et al. 2023

Beton und Stahlbetonbau

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Das Querkrafttragverhalten von Bauteilen ohne Querkraftbewehrung ist seit über 100 Jahren ein fester Bestandteil der Forschung im Massivbau. In den letzten Jahren sind verschiedene mechanische Querkraftmodelle entwickelt worden, die eine Vielzahl wichtiger Erkenntnisse über die Hintergründe des Querkrafttragverhaltens aufzeigen und in der Lage sind, physikalische Erklärungsansätze für das Querkraftversagen in Bauteilen ohne Schubbewehrung zu liefern. Diese Modelle bedürfen jedoch weiterer experimenteller Validierung. Hierbei spielen neue Messverfahren (z. B. digitale Bildkorrelation oder faseroptische Dehnungsmessung), die tiefere Einblicke in das Tragverhalten schubbeanspruchter Stahlbetonbauteile zulassen, eine entscheidende Rolle. Ausgehend von experimentellen Untersuchungen mit modernen Messverfahren wurde eine Software entwickelt, die eine automatisierte Erfassung der Rissbildung basierend auf der Finite‐Elemente‐Methode mit detaillierter Auswertung der Kinematik und der im Riss übertragenen Spannungen durchführt. In diesem Beitrag wird ein Überblick über verschiedene Auswertungsmethoden experimenteller Untersuchungen mit modernen Messverfahren gegeben, auf deren Basis eine vertiefte Bewertung neuer Modellansätze erfolgen kann.

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

Cited by 16 publications

References 51 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

On the energy dissipation in confined concrete subjected to shear cyclic loading

Neue Perspektiven auf das Querkrafttragverhalten von Stahlbetonbauteilen ohne Querkraftbewehrung

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