الفهرس 
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Abstract
1
TITLE: ”Dowel Action Effect on the Shear Capacity of Reinforced
Concrete Beams”
Submitted by: Eng. Dina Nabil Wadie
Supervised by: Prof. Dr. Osama Hamdy Abdel Wahed
Dr. Mohamed Nabil Mohamed
If the longitudinal reinforcement of a beam is loaded by a component
of a force acting perpendicular to the reinforcement bars this is called
dowel action.
Shear capacity of reinforced concrete beams depends on Concrete
strength, Stirrups volume and Presence of longitudinal steel which can
lead to a better reinforcement distribution in order to develop new
economical design.
Since most of codes and especially Egyptian code do not take into
consideration the effect of dowel action of longitudinal bars on the
shear capacity of reinforced concrete beams and due to lack of study of
the dowel action effect on the shear capacity of reinforced concrete
beams therefore we need more studies and research in this field.
The main objective of this thesis is to examine, experimentally and
theoretically, effect of cross section area of longitudinal steel on the
shear capacity of reinforced concrete beams, effect of location and
distribution of longitudinal steel on the shear capacity of reinforced
concrete beams and effect of Concrete Strength on the shear capacity of
,
reinforced concrete beams under two eccentric concentrated load, from zero up to failure load (causing combined bending, torsion and shear
stresses).
The experimental program consisted of testing eight medium scale
models of reinforced concrete beams. All the specimens had a clear
span of 2.00 m and a total length of 2.30 m. The cross section
dimensions were 150x300 mm. All the tested beams had the same
bottom reinforcement of 2~16 and variable additional reinforcement.
Stirrups were 5~6/m in all beams except specimen B6 ~hich is without
stirrups to examine the effect of the dowel action.
All beams were simply supported and symmetrically loaded with two
concentrated loads with distance 500 mm from the support and
consequently, the shear force is one-half the total applied load.
The analytical program considered in this study includes performing
nonlinear finite element models using ABAQUS v6.7 program, taking
into consideration the non-linear stress-strain curve of the concrete and
steel. These models are performed to simulate the beams behaviour and
to extend study of the behaviour of such beams. The FE results were
compared to those obtained from the experiments and the results agreed in a satisfactory way.
Finally, design guidelines, analysis of test results of RC beams and
recommendations were presented .
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