M-P Curves for Strengthened Concrete Columns with Active Confinement

Abstract eng:
Many existing reinforced concrete buildings suffer from lack of strength and ductility against lateral loads, especially earthquake load, due to design style based on old codes. Such buildings should be strengthened and retrofitted to comply with new loading and design requirements. Confinement of concrete is an effective and commonly used method in strengthening of columns. Confining of concrete increases compressive strength of concrete and enhances the ductility. Passive and active confinements are two methods for confining of concrete. In this study, effect of active confinement on axial and bending capacity of strengthened concrete columns using steel angle profiles is investigated and M-P curves are illustrated. Stress-strain curve of confined concrete is obtained using Drucker-Pruger model of ANSYS. This curve is modified to a parabolic curve; then is used for determination of bending moment-axial load (M-P) diagrams of aforementioned strengthened concrete columns. The diagrams are drawn for specific square columns with different reinforcement ratios and different compressive strength of concrete. These diagrams highlight the effectiveness of the method used for achievement of confinement of concrete columns.

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