الفهرس 
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Abstract
Geogrids are categorized as one of the geosynthetics materials that are
used for soil stabilization and reinforcing of earth structures such as earth
walls and dams. This research investigated the effect of using uniaxial
geogrids as additional reinforcement, in addition to, steel fibers in the
concrete mix, on the flexural behavior of beams. The experimental
research work comprised of testing thirteen simply supported reinforced
concrete (R.C) beams which were tested up to failure under four-point
loading. The variables of this study are: the volume of steel fibers (0.0,
0.5, 1.0 %), number of geogrid layers (one, two, and three layers), the
shape of the geogrid layers, and the longitudinal reinforcement
percentage. The mid-span deflection, failure loads, ductility, crack
patterns, steel, concrete and geogrid strains of the beams were reported
and compared. The test results concluded that the addition of geogrid
layers as a reinforcing technique proved to be an effective tool to improve
the flexural behavior of R.C beams and improve the cracking patterns.
The number of geogrid layers used in the beams plays a significant effect
in increasing the failure loads and decreasing the deflections of the
beams. The addition of steel fibers in R.C beams, in addition to, geogrid
layers increases the cracking loads, failure loads and reduces the
deflection of beams at failure loads. Increasing the fiber content from
(0.5%) to (1%) had a slight effect on increasing the maximum carrying
capacities of the beams. Addition of U-shaped geogrid layers had a
considerable effect on increasing the failure loads rather than the addition
of geogrid layers in the tension zone only.