Gholam Reza Havaei - Assistance Professor, Amirkabir University of Technology
Abolghassem Kermanti - Assistance Professor, Amirkabir University of Technology

This paper experimentally and investigates the behavior of reinforced concrete (RC) columns subjected to eccentricloading with experimental methods. The columns are reinforced and confined with cross spiral. The new confinementtechnique uses cross spirals to confine RC circular columns in order to enhance their strength and ductility. Eight RCcircular columns subjected to load eccentricity with two different grades of spirals steel, two different volumetric ratio ofconfining spiral and two different positions of cross spirals are experimentally tested. The force, axial and lateraldisplacement and concrete strains in different locations are measured during the testing. The columns are 1000 mm longwith two hunched heads of 500 mm height and 250 mm diameter.

Cross Spirally Circular, Reinforced Concrete Columns , Ductility, Strength