Mohsen Ali Shayanfar - Assistant professor, Dept of civil Engg. Iran University of Science and Technology, Tehran, Iran
Alireza Hobbi - Struct Eng., Dept of civil Engg. Iran University of Science and Technology, Tehran, Iran.

The overall behavior of the slender structural wall is determined by the behavior of the plastic hinge region at the wall base. A slender structural wall subject to a lateral load is damaged at the wall base. The failure of a slender structural wall with confined end-zones is caused by the crushing of the confined concrete, crushing of the unconfined concrete, fracture and buckling of the flexural re-bars, and fracture of the lateral re-bars. In this study, the crushing of the confined concrete and crushing of the unconfined concrete are investigated by section analysis. Moreover, the slender structural walls have flexural behavior and the behavior of bending members can be explained by moment–curvature relation. The moment-curvature relation for a section is determined using an analysis procedure that satisfies the requirements of strain compatibility, equilibrium of forces, and the stress-strain relations. The proposed moment-curvature relation is extended well into failure stage. Finally, correlation studies between analytical and experimental results are conducted with the objective to establish the validity of the proposed procedure. The occurrence of each failure modes depends on the quantity of confinement reinforcement, the depth of compressive zone, the depth of confined zone and properties of concrete and steel.

Slender structural walls, Failure mechanism, Moment-curvature relation, Confined concrete, Unconfined concrete