The effect of corroded stirrups on shear behavior of reinforced concrete beams

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Abstract
The corrosion is a serious problem of construction projects that affect structural durability. The effect of corroded stirrups at the behaviour of reinforced concrete beams especially on ultimate shear strength and ductility was investigated in this study. Eight specimens of reinforced concrete beams were tested with four-point loading until failure. The dimensions of the specimen were 150 mm wide, 200 mm high and 1200 mm long. Six specimens were accelerated through an electrochemical process. The main variables of this study were the stirrups diameter and corrosion level. The results concluded that the stiffness and strength reduced in corroded beams when compere with control specimens. This reduction exhibited to increase with the level of mass loss in stirrups and a smaller diameter of stirrups. In addition to that, the ductility index trended to reduce from 118% to 68% for groups A (Ø6 @ 200 mm c/c); while from 68% to 35% for group B (Ø8 @ 150 mm c/c) which indicates that brittleness of beams raised. At high corrosion level, failure modes may change from shear-compression failure to rupture of stirrups.

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