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Abstract
Metallic dissipaters are one possible method of seismic energy dissipation in structures which are displacement-activated supplemental damping devices that can be made of various metal alloys. These work by yielding of the dissipater under axial, flexural, torsional or shear deformation and loading. This study investigated three distinct types of metallic dissipaters: U-shaped Flexural Plate (UFP), Grooved Dissipater (GD), and Torsional Beam Dissipater (TBD). While UFPs made of mild steel are typically used in structures, its broader application is limited by durability concerns and larger size. Thus, this study proposed using aluminum and titanium alloys, along with mild steel for the fabrication of UFPs, GDs, and TBDs. Titanium alloy dissipaters showed the least residual deformation, highest strength, and longest fatigue life. Mild steel dissipaters had the highest energy dissipation, while aluminum had least over strength. This study also suggested modified versions of UFPs (MS-UFPs) made of mild steel and proposed with two design configurations: with or without a reinforcement around bending curvature. These are typically used in precast/prestressed concrete parking garages to connect structural floor components. MS-UFPs offers benefits like energy dissipation in shear and flexural. It exhibits extended fatigue life under cyclic loading with steady hysteresis.
