EXPERIMENT AND RESEARCH OF REINFORCED CONCRETE COLUMN EXTERNALLY BONDED WITH CFRP SHEETS UNDER ECCENTRIC LOAD

By experiment of 23 reinforced concrete columns under eccentric loads,the strength capacity,ductility and failure modes of the columns with and without CFRP bonding are compared and analyzed.Experimental results indicate that when bounded only with longitudinal CFRP,the strength capacity of the columns increased but the ductility of the columns decreased slightly.When strengthened with transverse CFRP,the ductility of the columns improved significantly,and the ultimate strength increased as well.When strengthened by the combined action of the longitudinal and the transverse straps of CFRP,most significant improvement in the strength and the ductility of the columns resulted.On the basis of the experiment,the method of calculating the ultimate strength of eccentrically-loaded columns reinforced by longitudinal CFRP is presented,the calculating results fit well with the experimental data.