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%0 Thesis
%A Ungermann, Jan
%T Punching shear behaviour of slabs with unbalanced moments
%I Rheinisch-Westfälische Technische Hochschule Aachen
%V Dissertation
%C Aachen
%M RWTH-2025-09575
%P 1 Online-Ressource : Illustrationen
%D 2025
%Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
%Z Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025
%X Punching shear describes the failure of flat slabs and footings under a combined loading of concentrated shear force and high bending stress. The influence of unbalanced moments due to load eccentricities, which typically occur in both flat slabs and footings, on the punching shear behaviour remains largely unexplored, particularly for footings. As the current punching shear models have been derived primarily from tests on flat slabs, not only the load eccentricity, but also the differences between slender flat slabs and compact footings must be considered in the modelling approaches. In the light of growing demands for sustainability and material efficiency, a realistic and safe punching design for footings and flat slabs is of increasing importance, which is why the accurate consideration of load eccentricities is the central tenet of this study. The influence of unbalanced moments is analysed through own experimental investigations on the eccentric punching shear behaviour of footings without shear reinforcement. When the punching cone forms incompletely with increasing load eccentricity, deformations increase disproportionately. By analysing the rigid body rotations, local rotational and translational deformations of the slab are determined sector-wise and serve as basis for deriving an extended kinematic punching shear model. Innovative multiaxial strain measurements confirm the formation of the compression ring at the higher loaded side of the column and the resulting triaxial stress state. The observed failure and redistribution mechanisms for concentrically and eccentrically loaded footings are used for the development of the Eccentric Punching Shear Response Theory. The proposed kinematic punching shear model for slabs without shear reinforcement allows, for the first time, to realistically predict the eccentric punching shear behaviour of flat slabs and footings. The introduced sector-based approach allows the differentiated determination of the local load-deformation behaviour of all sectors as well as the description of the rigid body rotations of the slab. The final stage of this study entails the validation of the kinematic punching shear model for concentric and eccentric loading. This is followed by the subsequent derivation of a new approach to account for unbalanced moments. Database analyses and comparisons with different design approaches confirm the efficiency of the developed approach. Consequently, it is concluded that, in conjunction with the forthcoming Eurocode 2, the goal of a safe yet economical punching shear design is fulfilled.
%F PUB:(DE-HGF)11
%9 Dissertation / PhD Thesis
%R 10.18154/RWTH-2025-09575
%U https://publications.rwth-aachen.de/record/1021316