DUCTILITY OF HOLLOW RC SHORT COLUMNS IN COMPRESSION REGION

Abstract

Five reinforced concrete short rectangular columns with hollow made from PVC pipe that placed in the center of cross section were tested under eccentrically axial loading in compression region with load eccentricity of 60mm (e < eb). The hollow ratio was taken from 3.63% up to 20.28%, and concrete strength used was 34.52MPa. The columns had four longitudinal steel reinforcements of 12mm diameter were symmetrically placed in both sides of the square column section with average yield strength of 323.06MPa, and average modulus of elasticity of 257411.49MPa. The objective of this research is to study the ductility of hollow RC short columns with square cross section of 150mm x 150mm. The results show that generally all columns give significant difference in ductility escalation. The maximum ductility escalation was occurred at column with maximum hollow ratio (20.28%), that is 16.38%, compared relatively to the solid column. It could be stated that PVC pipe installation in column will improve the ductility.