Kinematics-Based Modelling of Short Coupling Beams Retrofitted with FRP Wraps
Carretero García, Claudia
Promotor(s) : Mihaylov, Boyan
Date of defense : 25-Jan-2019/5-Feb-2019 • Permalink :
|Title :||Kinematics-Based Modelling of Short Coupling Beams Retrofitted with FRP Wraps|
|Author :||Carretero García, Claudia|
|Date of defense :||25-Jan-2019/5-Feb-2019|
|Advisor(s) :||Mihaylov, Boyan|
|Committee's member(s) :||Franssen, Jean-Marc
|Discipline(s) :||Engineering, computing & technology > Civil engineering|
|Target public :||Professionals of domain|
|Institution(s) :||Université de Liège, Liège, Belgique|
|Degree:||Master en ingénieur civil des constructions, à finalité spécialisée en "civil engineering"|
|Faculty:||Master thesis of the Faculté des Sciences appliquées|
[en] Reinforced concrete short coupling beams are placed between shear walls to create a
coupled-wall system. It provides very effective lateral bracing for buildings subjected to
earthquakes or wind loading. This type of beams have commonly aspect ratios a/h
smaller than 2.5 approximately. As a result, they are susceptible to brittle shear failures
that need to be suppressed with dense transverse and diagonal reinforcement. To
improve the shear behavior and suppress such failures in deficient existing coupling
beams, it is now common to use fiber-reinforced polymers (FRP) which are wrapped
around the section.
The aim of this thesis is to propose an extension of an existing Two-Parameter
Kinematic Theory (2KPT) developed by Mihaylov et al. (2015), which predicts the shear
behaviour and deformations patterns of conventional reinforced concrete short
coupling beams, to account for the effect of FRP wraps. To assist in the development
of the model, data from tests of coupling beams strengthened with FRP wraps has been
collected from the literature.
The 2KPT for conventional RC coupling beams uses two degrees of freedom and is
based on first principles: kinematics, equilibrium and constitutive relationships for the
s of shear resistance. The model considers five components of shear resistance across
the critical shear cracks: diagonal compression in the critical loading zones, aggregate
interlock, tension in the stirrups, and dowel action of the longitudinal reinforcement.
The kinematic model predictions (implemented in a Matlab code) are compared to 4
tests from the literature. It is shown that the model captures properly the shear
behaviour for diagonal tension failure.
Finally, to account for the shear contribution of FRP wraps, another component of shear
resistance must be implemented in the kinematic model. Two approaches are studied
depending on the failure mode of FRP wraps described in the literature review: rupture
or debonding. To validate the extended kinematic model, a comparison with test
results is performed. It is shown that the predicted shear strengths agree well with
values found in the experimental studies.
Cite this master thesis
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