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@PHDTHESIS{Ungermann:1021316,
author = {Ungermann, Jan},
othercontributors = {Hegger, Josef and Claßen, Martin and Vollum, Robert Lars},
title = {{P}unching shear behaviour of slabs with unbalanced
moments},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-09575},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, Rheinisch-Westfälische Technische
Hochschule Aachen, 2025},
abstract = {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.},
cin = {311610},
ddc = {624},
cid = {$I:(DE-82)311610_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-09575},
url = {https://publications.rwth-aachen.de/record/1021316},
}
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