الفهرس 
CHAPTER (1): INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Glass-fiber reinforced polymer pipes (GFRP) have been recently used
as permanent casings in the construction of foundations piles. Benefits of
GFRP composite piles, as compared to conventional concrete-filled steel
casing piles, include long term durability, high strength, low maintenance
costs, and long expected service life especially when used in marine
applications and other corrosive environments.
In this study locally manufactured GFRP pipes are filled with concrete
to produce composite GFRP-concrete piles. The main objective of this
research is to study the behavior of the composite GFRP-concrete piles
embedded in dry dense sand in both cases of lateral and axial loading
conditions.
First, the confining effect of GFRP pipes on the concrete core was
investigated by laboratory tests on short composite cylindrical cross sections
subjected to axial compression. Four point bending tests on concrete, GFRP
hollow pipes and GFRP composite cross sections have followed to
investigate the flexural behavior. Laboratory model tests of the GFRP
composite piles, installed in dry sand, have been performed to investigate the
behavior under axial compression and lateral loading.
The test results showed that the internal capacity of the proposed
composite section significantly exceeds the sum of the individual load
capacity of the two materials in both cases of axial and flexural loadings.
The ultimate strength and strain of the tested GFRP-Concrete cross sections
are comparable to the published equations for axial ultimate strength.