37º IAHS World Congress on Housing: - Universidad de Cantabria

XXXVII <strong>IAHS</strong><strong>World</strong> <strong>Congress</strong> on HousingOctober 26 – 29, 2010, Santander, SpainCODE: 146STRUCTURAL PERFORMANCE IMPROVEMENT OFCONCRETE ELEMENTS REINFORCED WITH CFRPSHEETS.Martínez Martínez, J. A., Rubio Peirotén, D., Aragón Torre, G., Crespo Martínez, M.Department of Civil EngineeringUniversity of Burgos, Spaine-mail: jamartinez@ubu.esKey words: Fiber reinforced concrete, CRFP, Delamination, Peeling, Transversal StripsAbstractThe use of CFRP to reinforce concrete structures is a spread technique nowadays. Thestructural properties of carbon fiber polymers, that is, very high resistance and high elasticitymodulus as well as low weight, which allows to reduce the amount of specialized work andauxiliary equipments, make them a powerful reinforcement system. However, the cost of thematerials, the loss of ductility, due to the lack of plasticity in CFRP previous to failure, andthe early delamination failure, which occurs with stress levels far from tensile strength ofsheets, are important problems to be considered in the design process. In this paper somemechanisms aimed at improving the performance of flexural elements reinforced with CFRPsheets in terms of delamination strength, ductility and material optimization are presented.Different reinforcement patterns with longitudinal sheets and transversal CFRP wrap stripsare studied. Additionally, with the purpose of establishing the influence of the bending andshear efforts laws in the response of the reinforced structure, two load case configurations areanalyzed.37º <strong>IAHS</strong> <strong>World</strong> <strong>Congress</strong> On Housing Science 91