The effect of Welded Wire Fabric (WWF) confinement on axial capacity of hollow columns

Abstract

The aim of the study was to determine the effect of installing different sizes of Welded Wire Fabric (WWF) as a concrete restraint on axial carrying capacity of hollow columns. WWF is used with a wire spacing of 12.2 times 12.2 mm, 19 times 19 mm, 25 times 25 mm, with a diameter of 0.7 mm. A hole of 1 inch in the column causes a decrease in compressive strength of the column of 5.62 percent, i.e., from compressive strength of 226.697 kg per square cm (specimen A) to its compressive strength 214, 065 kg per square cm (specimen B). The percentage increase in axial carrying capacity of the perforated column type C is 13.16 percent, W1 is 2.96 percent, W2 is 11.33 percent, W3 is 13.27 percent, SW1 is 0.51 percent, SW2 is 5.51 percent and SW3 is 9.08 percent. WWF is able to increase compressive strength of hollow concrete columns by W1 is 7.08 percent, W2 is 12.41 percent, W3 is 14.36 percent, SW1 is 4.53 percent, SW2 is 9.73 percent and SW3 is 14.59 percent.