Title: CFRP Reinforced Concrete Columns under Eccentric Loading

Author(s): Murat Saatcioglu

Publication: Web Session

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Date: 10/29/2020

Abstract:
A comprehensive research program was conducted at the University of Ottawa involving CFRP reinforced concrete columns under eccentrically loaded monotonic loading, as well as columns and beams under reversed cyclic loading. A total of 21 Large-scale specimens were tested to assess the performance of CFRP reinforced concrete members under flexure and shear. The current paper presents the results of column tests under monotonically increasing eccentric loading. The columns had a 230 mm square cross-section reinforced with either 4 or 8 LeadLine CFRP bars as longitudinal reinforcement and NEFMAC CFRP grids as transverse reinforcement. Test variables included the level of end eccentricity, reinforcement arrangement and the spacing of transverse reinforcement. The columns were analyzed using stress-strain relationships for CFRP reinforcement in tension and compression, as well as unconfined and confined concrete. Moment-curvature relationships obtained were compared with those recorded experimentally. Column axial force-moment interaction diagrams were developed and compared with experimental capacities. The results indicated that the columns developed their flexural capacities as computed by plane-section analyses, based on concrete crushing between 0.33% and 0.40% compressive strains. The CFRP bars maintained their integrity until after the crushing of concrete. Failure of CFRP bars in compression was observed between 0.45% and 0.8% compressive strains depending on the spacing and arrangement of transverse reinforcement. Ductile failure was observed in confined columns. The paper presents the results of both experimental and analytical phases of research.