Abstract
This study is focused on the effectiveness of a strengthening technique using the combined metallic yielding devices (CMDs) as passive energy dissipation systems to enhance the lateral load resistance and the deformation capacity of the damaged reinforced concrete (RC) frames. An experimental investigation has been conducted on two geometrically-identical damaged RC frames under the lateral cyclic loading condition. In addition to the CMDs, the beam and columns of the damaged frame have been fully/partially strengthened using the additional steel elements. This study highlights the importance of the positioning of CMDs, the selection of local strengthening strategy, and the proper installation of CMDs on the lateral load resistance and energy dissipation potential of the damaged RC frames. The strengthened frames exhibited the enhanced lateral strength, lateral stiffness, lateral deformation capacity, energy dissipation and damping potential up to a storey drift of 6%. Test results are further used to validate a design methodology proposed for the proportioning of CMDs required to achieve the desired lateral resistance of the damaged RC frames.
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