Behavior of Reinforced Concrete Columns Confined by New Steel-Jacketing Method

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Title: Behavior of Reinforced Concrete Columns Confined by New Steel-Jacketing Method

Author(s): Eunsoo Choi, Young-Soo Chung, Joonam Park, and Baik-Soon Cho

Publication: Structural Journal

Volume: 107

Issue: 6

Appears on pages(s): 654-662

Keywords: external pressure; grouting; reinforced concrete columns; seismic retrofit; steel jacket

Date: 11/1/2010

Abstract:
This paper introduces a new steel-jacketing method for reinforced concrete (RC) columns using external pressure. Experimental tests of concrete cylinders and RC columns are performed to assess the effectiveness of the proposed method. Single- and double-layered jackets are introduced. The newly jacketed cylinders show good results in terms of increasing the compressive strength and ductility compared to plain cylinders. The double-layered jackets are estimated to show equal performance to that of a single steel jacket having the same thickness as the double-layered jacket. Four columns are prepared and two of them are confined by steel jackets with external pressure; one is a single-layered jacket and the other is a double-layered jacket. The proposed steel-jacketing method increases the ductility of lap-spliced RC columns. The doublelayered jacketed column produces more ductile behavior than the single-layered jacketed column.