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Querkrafttragverhalten von Stahlbeton-Fahrbahnplatten
Citation Link: https://doi.org/10.15480/882.2270
Publikationstyp
Doctoral Thesis
Date Issued
2019
Sprache
German
Author(s)
Advisor
Referee
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2019-04-10
Institut
TORE-DOI
TORE-URI
First published in
Number in series
18
Citation
Technische Universität Hamburg (2019)
Publisher
Shaker Verlag
The present work deals with the load-bearing behavior of reinforced concrete slabs. The focus
is on the load transfer of concentrated single or block loads, as they occur in bridge structures
in the form of wheel loads. However, the findings can also easily be applied to general cases of
concentrated block loads on reinforced concrete slabs.
In the previous research work on the bearing capacity in shear of reinforced concrete roadway
slabs it could be repeatedly stated that the shear bearing capacity of the slabs under single loads
is higher than the calculated resistance according to current design rules would expect. Nevertheless,
so far no increased bearing capacity could be derived. This discrepancy should be remedied
by the present work.
After an overview of the field of research and previously performed test series, the research
needs and open questions are derived. Based on this, the structural behavior of reinforced concrete
slabs under single loads is examined on the basis of large-scale model tests performed at
TUHH. From this, one can directly answer many open questions from previous research. In
addition, material-non-linear FE simulations are performed to investigate the load transfer of
the plates in more detail. The calculations are validated based on the real experiments.
It can be shown that the usual fixed relevant design section at the support region is not meaningful,
and that the shear forces should be determined close to the concentrated loads. However,
these are many times higher than the shear forces at the support of the slab.
A hands-on approach to determining the internal forces out of concentrated loads from linearelastic
FE calculations is presented and an approach to taking into account the increased load
bearing capacity of reinforced concrete slab structures based on the current design equation
according to EC2 is proposed. In doing so, the required level of safety in the case of modified
proof of the shear bearing capacity is demonstrated by means of a statistical database analysis
of selected tests on slabs.
It is explained how the direct load transfer of concentrated loads close to the support works
phenomenological, and how the failure mechanism of slabs under single loads is related to
punching. Finally, it will be shown how the fraction of the inclined compression strut from
bending Vccd should be evaluated on haunched slabs.
is on the load transfer of concentrated single or block loads, as they occur in bridge structures
in the form of wheel loads. However, the findings can also easily be applied to general cases of
concentrated block loads on reinforced concrete slabs.
In the previous research work on the bearing capacity in shear of reinforced concrete roadway
slabs it could be repeatedly stated that the shear bearing capacity of the slabs under single loads
is higher than the calculated resistance according to current design rules would expect. Nevertheless,
so far no increased bearing capacity could be derived. This discrepancy should be remedied
by the present work.
After an overview of the field of research and previously performed test series, the research
needs and open questions are derived. Based on this, the structural behavior of reinforced concrete
slabs under single loads is examined on the basis of large-scale model tests performed at
TUHH. From this, one can directly answer many open questions from previous research. In
addition, material-non-linear FE simulations are performed to investigate the load transfer of
the plates in more detail. The calculations are validated based on the real experiments.
It can be shown that the usual fixed relevant design section at the support region is not meaningful,
and that the shear forces should be determined close to the concentrated loads. However,
these are many times higher than the shear forces at the support of the slab.
A hands-on approach to determining the internal forces out of concentrated loads from linearelastic
FE calculations is presented and an approach to taking into account the increased load
bearing capacity of reinforced concrete slab structures based on the current design equation
according to EC2 is proposed. In doing so, the required level of safety in the case of modified
proof of the shear bearing capacity is demonstrated by means of a statistical database analysis
of selected tests on slabs.
It is explained how the direct load transfer of concentrated loads close to the support works
phenomenological, and how the failure mechanism of slabs under single loads is related to
punching. Finally, it will be shown how the fraction of the inclined compression strut from
bending Vccd should be evaluated on haunched slabs.
Subjects
Querkraft
Tragfähigkeit
Bemessung
Stahlbeton
Platte
konzentrierte Last
Einzellasten
DDC Class
620: Ingenieurwissenschaften
690: Hausbau, Bauhandwerk
720: Architektur
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