Abstract
AbstractThis research investigates the behaviour of reinforced concrete (RC) columns subjected to eccentric loading (combination of axial loading and bending moment) for tall buildings with experimental and numerical methods. The columns are reinforced and confined with regular spiral and cross spiral (new technique). The new confinement technique uses two opposing spirals (cross spirals) to confine RC circular columns in order to enhance their strength and ductility. Fourteen RC circular columns subjected to different load eccentricities with two different grades of spirals steel are experimentally tested. The force, axial and lateral displacement and concrete strains in different locations are measured during the testing. The columns are 1000‐mm long with two hunched heads of 500‐mm height. The experimental and numerical results are compared and utilized to develop design guidelines of RC columns using the new confinement technique. Copyright © 2009 John Wiley & Sons, Ltd.
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