Seismic Resistance of Square Concrete Columns Retrofitted with Glass Fiber-Reinforced Polymer

Appropriate confinement of the potential plastic hinge regions of reinforced concrete columns ensures the ability of those columns to sustain inelastic displacement without significant strength and stiffness degradation during an earthquake. This article reports on research undertaken to evaluate the effectiveness of glass fiber-reinforced polymer (GFRP) wraps for strengthening deficient and repairing damaged square concrete columns. Each of the eight specimens tested, representing columns of buildings and bridges constructed before 1971, consisted of a 305 x 305 x 1473 mm column connected to a 508 x 762 x 813 mm stub. Specimens were tested under constant axial compression and cyclic lateral displacement excursions simulating earthquake loads. The test results reveal that retrofitting with GFRP wraps significantly enhanced ductility, energy dissipation ability, and shear and moment capacities of deficient columns. Cyclic behavior progressively improved as the number of GFRP layers increased, causing both stiffness degradation and strength reduction rates to decrease. The level of axial load has a significant effect on the overall performance of the columns; i.e., a considerable reduction in ductility was observed for the specimens tested under high axial load. The authors conclude that GFRP-confined columns exceeded the performance of similar columns that contained transverse steel reinforcement.

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  • Authors:
    • Memon, Muhammad S
    • Sheikh, Shamim A
  • Publication Date: 2005-9


  • English

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  • Accession Number: 01003960
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 19 2005 7:40AM