Shear Strength of an Outside Strengthening on Columns by Thin Steel Plate with Ribs and Fiber Sheets for Existing R/C Column

Abstract

The main objective of this paper is to examine the shear strength of seismic retrofitting by external reinforcement for existing RC columns. The method proposed herein is external reinforcement using divided thin steel plate with ribs and polyethylene fiber sheets with a grout mortar layer. In order to investigate the shear strength, lateral loading tests were conducted for four specimens with two different column heights and two different rib widths. The test results show that this method is very effective in enhancing the shear strength by providing ribs on steel plates. Theoretical formulas derived from the model of compressive struts are proposed to evaluate the ultimate shear capacity.