Studies on carbon FRP (CFRP) prestressed concrete bridge columns and piles in marine environment.
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1998-11-01
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Alternative Title:Studies on carbon fiber reinforced plastics prestressed concrete bridge columns and piles in marine environment
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Edition:Final report.
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Abstract:The main objective of this study was to investigate the feasibility of using concrete piles pretensioned with Carbon Fiber Reinforced Plastics (CFRP) tendons. The study reviews the available literature on mechanical properties of CFRP reinforcement, durability of FRP rods and tendons, service and ultimate load, and time dependent behavior of FRP reinforced concrete columns, existing models on confined concrete reinforced with steel ties and hoops, and pile driving. An experimental program was carried out to study the durability of CFRP tendons exposed to air, seawater and alkaline solutions for different time duration. The ultimate strength analysis of CFRP reinforced concrete slender columns was made utilizing the moment magnification method and the CFRP stress-strain characteristics. An experimental investigation on the ultimate load behavior of eight CRFP reinforced concrete slender columns was carried out and the results compared with the theoretical values. An analytical and experimental investigation was made on the long term behavior of CFRP reinforced concrete beams and columns under sustained loading. Four concrete beams and four concrete columns were subjected to sustained uniform load intensity for two years. A method to predict the total deformations of CFRP reinforced concrete members at any time is proposed considering the instantaneous and time dependent deformations. The feasibility of using pretensioned concrete piles with CFRP tendons in marine environment was examined based on analytical and experimental studies. Prior to fabrication and driving the test piles, an investigation of the pile driving site and equipment was made in order to determine the pile driving stresses using the wave equation analysis. The design, instrumentation, fabrication and driving of pretensioned concrete piles with CFRP tendons were carried out successfully in the study. The pile driving test results of the CFRP pretensioned concrete piles are discussed and compared with those of the concrete piles pretensioned with steel. The load deformation characteristics of the concrete columns are established for different CFRP hoop spacing based on testing eleven concrete column specimens. The strength enhancement due to the CFRP hoops is evaluated using a proposed stress vs. strain model for confined concrete.
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