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A platform for research: civil engineering, architecture and urbanism
Thin-Wall Synthetic Fiber Reinforced Concrete Pipe Performance under Cyclic Loading
Thin-walled concrete pipes reinforced with synthetic fiber long with steel reinforcement have been evaluated recently as a new concrete pipe, which is cheaper, more flexible, and lighter than the conventional concrete pipes. However, there is very limited information in the literature regarding the performance of the new concrete pipe system. The objective of this study is to investigate the performance of thin-walled concrete pipe reinforced with synthetic fiber along with a steel reinforcement cage under cyclic loading. Concrete pipe with a diameter of 1,200 mm (60 in.) and wall thickness of 50 mm reinforced with fiber dosage of 9 kg/m3and steel area of 10.2 cm2/m was evaluated using a three-edge bearing test. The pipe was loaded to 50% of its ultimate load capacity obtained in previous study by the author. The pipe performance was evaluated in terms of load-deflection behavior, stiffness, crack propagation, and crack width. The load-deflection curve during the loading and unloading stages were coincident due to the pipe ductile behavior. Also, the deflection ratio (radial deflection divided by diameter) exceeded that for semi-rigid pipes reported by past research, indicating that the new concrete pipe system could endure more loads for passive support of surrounding soil. Pipe stiffness, calculated as the ratio of ultimate applied to the corresponding deflection, was stable during all load cycles, which could be attributed to the coupling effect of the fiber and steel reinforcement cage. Cracks propagated longitudinally at outer springline, inner crown, and inner invert where high flexural stresses are expected. Crack widths measured at the inner invert, inner crown, and outer springling did not exhibit a significant increase after each cycle due to the synthetic fiber bridging effect.
Thin-Wall Synthetic Fiber Reinforced Concrete Pipe Performance under Cyclic Loading
Thin-walled concrete pipes reinforced with synthetic fiber long with steel reinforcement have been evaluated recently as a new concrete pipe, which is cheaper, more flexible, and lighter than the conventional concrete pipes. However, there is very limited information in the literature regarding the performance of the new concrete pipe system. The objective of this study is to investigate the performance of thin-walled concrete pipe reinforced with synthetic fiber along with a steel reinforcement cage under cyclic loading. Concrete pipe with a diameter of 1,200 mm (60 in.) and wall thickness of 50 mm reinforced with fiber dosage of 9 kg/m3and steel area of 10.2 cm2/m was evaluated using a three-edge bearing test. The pipe was loaded to 50% of its ultimate load capacity obtained in previous study by the author. The pipe performance was evaluated in terms of load-deflection behavior, stiffness, crack propagation, and crack width. The load-deflection curve during the loading and unloading stages were coincident due to the pipe ductile behavior. Also, the deflection ratio (radial deflection divided by diameter) exceeded that for semi-rigid pipes reported by past research, indicating that the new concrete pipe system could endure more loads for passive support of surrounding soil. Pipe stiffness, calculated as the ratio of ultimate applied to the corresponding deflection, was stable during all load cycles, which could be attributed to the coupling effect of the fiber and steel reinforcement cage. Cracks propagated longitudinally at outer springline, inner crown, and inner invert where high flexural stresses are expected. Crack widths measured at the inner invert, inner crown, and outer springling did not exhibit a significant increase after each cycle due to the synthetic fiber bridging effect.
Thin-Wall Synthetic Fiber Reinforced Concrete Pipe Performance under Cyclic Loading
Al Rikabi, Fouad T. (author) / Sargand, Shad M. (author) / Khoury, Issam (author) / Kurdziel, John (author) / Hussein, Husam H. (author) / Ahmed, Safiya (author)
Pipelines 2019 ; 2019 ; Nashville, Tennessee
Pipelines 2019 ; 547-554
2019-07-18
Conference paper
Electronic Resource
English
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