الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Fiber reinforced polymer composite (FRP) is a new construction material,
gradually gaining acceptance from civil engineers. Bridge engineering is
among the fields in civil engineering benefiting from introducing FRP
composite. In the past 15 years, experiments have been conducted to
investigate the applicability of FRP composite in bridge structures,
including the applications of FRP composite beam, deck, and column.
Beam is one of the most important structural elements in bridge structural
system, so knowing the structural behavior of beams is very important. In
this study an analytical solution for stress analysis of composite laminated
beam with Box-section has been developed. The solution includes the
structural characteristics which are often ignored in the most published
studies such as axial and bending stiffness. These structural characteristics
have been used to calculate the stresses and strains in each ply of the Boxsection.
Also a computer program has been created using MATLAP
language to calculate the stresses and strains obtained from the analytical
solution for any Box-section subjected to axial force or bending moment.
Furthermore, a finite element model has been developed using ANSYS
software to validate the results obtained from the analytical solution and it
has been seen a good agreement between results.
Moreover, a parametric study has been conducted using the developed
finite element model. Various composite beam cross sections have been
included in this study; equal flanges I-section, unequal flanges I-section,
and square Box-section. The parametric study includes the effect of fiber
orientation angle on the axial, bending, and torsional deformations.
Furthermore, the effect of changing the number of layers in both the web
and flange laminates on the formerly mentioned deformations (i.e. axial,
bending, torsional deformations) has been studied. Also for each considered
III
cross section and loading condition, the optimum fiber orientation angle
and the optimum number of layers in web and flange laminates have been
determined.