الفهرس 
CHAPTER (1)Only 14 pages are availabe for public view
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Abstract
”In construction engineering, the usage of synthetic structural fibers in concretebeams reinforced with Fiber-Reinforced Polymer (FRP) bars has drawn a lot of attention. Rusting of steel reinforcement in marine environments causes overall destruction of reinforced concrete constructions, steel rebars in concrete members have been replaced with fiber-reinforced polymer (FRP) bars in recent years. To enhance the shear behavior of glass (GFRP) bars reinforced concrete (RC), macro-synthetic polyolefin (PO) fiber was added These materials have low modulus of elasticity, a high tensile strength, and a linear stress-strain response full failure. This research investigates how synthetic fibers alter the behavior of these composite materials. It analyses theusage of macro synthetic structural fibers for boosting the post-cracking and deformability qualities of (GFRP) reinforced concrete beams without transverse reinforcement, as well as how fibers affect the flexural characteristics and ductility of GFRP beams. Eight full-scale RC beams (without stirrups) are exposed to a two-point loading system by changing the present of PO fiber and evaluated under flexure. The test specimens include (i) four beam GFRP reinforcement with PO fiber (00, 0.28%, 0.44%, 0.60%) (ii) four beam steel reinforcement with PO fiber (00, 0.28%, 0.44%, 0.60% all beams have reinforcement ratio 0.4%. The results show that the inclusion of fiber greatly improved the post-cracking action, durability, performance, and flexural behavior by increasing the ductility level. Furthermore, the outcomes of the tests were compared to the predicted ultimate flexural moment. The fiber incorporation improved the FRP bar-reinforced concrete beams’ ultimate flexural strength, split tensile strength and first-cracking load. It also reduced the beams’ wide cracks at service loads and improved the deformability of GFRP and steel-reinforced concrete beams.”