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Kraftübertragung in Biegeschubrissen von Betonbauteilen
Citation Link: https://doi.org/10.15480/882.16763
Publikationstyp
Doctoral Thesis
Date Issued
2026
Sprache
English
Author(s)
Advisor
Referee
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2025-05-16
Institute
TORE-DOI
First published in
Number in series
22
Volume
22
Citation
Schriftenreihe des Instituts für Massivbau der TUHH 22: (2025)
Publisher DOI
Publisher
Shaker Verlag
ISBN
978-3-8191-0386-5
Peer Reviewed
true
To investigate the kinematics of critical shear cracks and the shear force component from aggregate interlock, tests were conducted on single-span concrete beams with rectangular and T-beam cross-sections under concentrated loads close to the support. The concrete compressive strength, the reinforcement ratio and the maximum aggregate size varied in the experiments. Digital Image Correlation (DIC) was used to precisely capture the deformation and cracking behavior of the beams and allowed the determination of shear and normal stresses within the cracks. Established aggregate interlock models, such as those from Walraven, Gambarova and Li, were applied as a basis for further analysis. It was found that in most cases the contribution of aggregate interlock to load transfer is relatively minor. Visual and photogrammetric inspection of the crack surfaces revealed that, despite the normal-strength concrete, a considerable proportion of the aggregates fractured in the crack plane. The crack kinematics showed that there were no geometric contact points between the aggregates and the cement matrix.
Additional investigations were conducted using non-linear FE simulations. The shear force components were calculated, which were comparable in size to those observed in the tests. Finally, the basic assumptions of Walraven’s aggregate interlock model were realistically simulated and evaluated. Significant discrepancies between the results of the FE-simulations and the simplifications of the aggregate interlock model were seen. Various indicators suggested that aggregate interlock serves a negligible role in shear force transfer, both in beams with and without shear reinforcement.
Additional investigations were conducted using non-linear FE simulations. The shear force components were calculated, which were comparable in size to those observed in the tests. Finally, the basic assumptions of Walraven’s aggregate interlock model were realistically simulated and evaluated. Significant discrepancies between the results of the FE-simulations and the simplifications of the aggregate interlock model were seen. Various indicators suggested that aggregate interlock serves a negligible role in shear force transfer, both in beams with and without shear reinforcement.
Subjects
reinforced concrete; shear
shear resistance
aggregate interlock
nonlinear FEA
DDC Class
624.1: Structural Engineering
518: Numerical Analysis
Publication version
publishedVersion
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