الفهرس 
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Abstract
An analytical finite element model has been developed in order to study the
behaviour of the rectangular hollow section T -joints under branch axial compressive force. The finite element computer program ANSYS is employed using 3D 4-noded shell element. The influences of the geometrical and material non-linearity are considered.
In order to verify the numerical results, comparisons are made between results of
the proposed model, the experimental results and the design formulas available in the
literature.
After the verification, a parametric study has been carried out in order to study the
static behaviour of the RHS T -joints under branch axial compressive force using different
types of reinforcement; transverse plates, haunches, stiffening plate, truncated pyramid and
chord webs side plates. Also, The study has been done by varying the geometrical
parameters of the RHS T-joints such as the width ratio,p, the chord width to thickness
ratio, 2 r ,and the thickness ratio, T •
New tie bar reinforcement has been proposed in order to study its performance on
the static behavior of hollow section joints; the ultimate load, ultimate load capacity at
certain deformation limit, ductility, changing modes of failure and decreasing the stress
concentrations at the upper chord flange comparing with all other types of reinforcement.
Also, the effects of best bars’ number, location at which the bars are to be placed and bars’
diameter on the ultimate load capacity have been studied.