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YesThe current paper presents a simple unbonded-type column strengthening technique with wire rope units and few\udsteel elements. Eleven short columns were strengthened using the proposed procedure and tested under monotonic\udconcentric axial loads. The main variables investigated to evaluate the confinement effectiveness of strengthened\udconcrete columns were the volume ratio, prestress, diameter, spacing and configuration of wire rope units. The\udstrength gain factor and ductility ratio increased with the increase of volume ratio of wire ropes. The prestress\udapplied to wire ropes had little influence on the strength gain factor but the ductility ratio decreased with the\udincrease of prestress in the wire ropes, owing to earlier rupture of wire ropes. At the same volume ratio of wire\udropes, the maximum strength of columns was nearly independent on the configuration of the wire ropes, but higher\udductility was exhibited by columns strengthened with rectangular spiral-type wire ropes than by columns strengthened\udwith hoop-type wire ropes, until rupture of the wire ropes. The strength gain factor and ductility ratio of\udstrengthened columns were compared with those of tied columns tested in a previous study. The load capacity of\udstrengthened columns was also predicted using the ACI 318-05 equation modified to reflect the load-carrying effect\udof steel elements. A much higher strength gain factor and ductility ratio were exhibited by strengthened columns\udthan tied columns having the same lateral reinforcement, except for strengthened columns with wire rope spacing\udabove 0.5 times core width. The axial load capacity of strengthened columns was higher than that of unstrengthened\udcolumns by 5¿20%, and could be reasonably predicted using the modified ACI 318-05 equation

Tests of reinforced concrete short columns laterally strengthened with wire rope units and steel elements