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چکیده
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Although self-centering rocking walls have shown acceptable performance in decreasing downtime, repair cost, and continuous serviceability, their energy dissipation capacity is relatively low. This research introduces a supplementary rebar system (SRS) to improve the energy dissipation capacity of rocking walls. The advantages of this system are its high efficiency, applicability, simplicity of the installation, and easy replacement after yielding/failure. In this research, the efficiency of the proposed SRS was assessed by conducting a parametric study by considering the cross-sectional area, number, and location of the proposed SRSs as the study variables via seven numerical models. To this end, validated nonlinear finite element models were utilized. The results demonstrated that the models with the SRSs installed at the edge had higher load-carrying capacity, stiffness, and energy dissipation capacity. All the models under cyclic loading had stable flag-shaped hysteretic behavior up to a drift of 3% without significant strength loss. Employing SRSs increases the stiffness of the walls; however, by increasing ductility, the wall stiffness declines. Increasing the studied walls’ energy dissipation capacity and reaching the equivalent viscous damping of up to 17.36% demonstrate the efficiency of the proposed SRS. Moreover, as the first moment of area of the SRS increases, the models’ maximum base shear increases, and the ductility ratio and displacement amplification factor decrease. The response modification and displacement amplification factors were recommended to be 5.50 and 3.55, respectively, for rocking walls with the proposed SRS.
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