Fiber-Reinforced Polymer Composite Materials Systems to Enhance ReinforcedConcrete Structures

摘要

The use of Fiber Reinforced Polymer (FRP) composites was investigated forpurposes of enhancing, protecting, repairing, or upgrading reinforced concrete structures. Design methods and repair applications were addressed, as were durability issues and in field test methods for performance verification. Investigations included shear rehabilitation techniques for concrete beams, in field test methods to determine the bond strength of FRP composites, and low temperature evaluation of FRP performance. Field demonstrations included evaluation of carbon fiber reinforced polymer tendons for post-tensioning of double tee beams and wall repair at a sewage treatment facility. Also, a feasibility study and laboratory tests were performed to evaluate glass fiber reinforced polymer cables as tie back tension members, and a test fixture was designed and fabricated to evaluate post stressing tendon drape angle performance. Design examples were developed for shear upgrade of concrete beams, post-tensioning of double tee beams, and tie back rod arrangements. Finally, a model was developed to predict failure mechanisms for reinforced concrete beams with FRP sheets or plates bonded to the bottom tensile face.