Parametric study of concrete columns strengthened with composite straps
AuthorLi, Mu-wen, 1963-
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PublisherThe University of Arizona.
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AbstractThis study investigates the feasibility of high-strength composite materials for strengthening of seismically deficient concrete columns. The concrete columns will be externally confined by wrapping thin straps of glass-fiber-reinforced or carbon-fiber-reinforced straps around the column. The confinement provided by the straps will increase the stress and strain of concrete at failure and will increase its ductility. Moreover, the composite strap will prevent spalling of the shell and will further increase the load carrying capacity of the column. Analytical models are developed for the analysis of circular and rectangular columns externally confined with high-strength composite straps. A parametric study is conducted to investigate the effectiveness of this technique for strengthening of concrete columns designed before the new seismic design provisions and codes were in place. The results indicate that external confinement provided by the composite straps significantly increases the strength and ductility of concrete columns.