| Title |
Structural Performance of Reinforced Concrete Columns due to Corroded Main and Hoop Bars |
| Authors |
Chung Lan ; Won Jong-Ho ; Cho Seung-Ho |
| Keywords |
Corrosion level ; Durability ; Compressive member ; Lateral load ; Hoop bar |
| Abstract |
Due to the shortage of natural fine aggregates, sea sand has been alternatively used for casting of concrete. However, due to the presence of sodium in sea sand, the threat of corrosion in reinforcing steels embedded in concrete made from sea sand has been a major concern recently. In some instances, aggregates, primarily fine aggregates, contaminated with chlorides have been used in the concrete, resulting in rapid corrosion of reinforcement and reducing durability and structural performance in reinforced concrete structures. In order to qualitatively and quantitatively understand structural performance and strength degradation of reinforced concrete column due to corroded bar embedded, thirteen reinforced concrete columns were tested in terms of corrosion level of the main reinforcing bars and stirrups. Since the axial strength degradation is relatively smaller than that of moment strength, axial force and horizontal force are applied separately.
The experimental results showed that;
(1) Moment strength of reinforced column due to horizontal force reached the maximum value when the main reinforcing bar corroded 1.2% of its original weight, and reduced rapidly after corrosion rate 4.3%.
(2) The degradation of moment strength is minimized as the number of stirrups increased.
(3) The level of corrosion in stirrups does not affect the strength of concrete column in case of having same number of stirrups. |