Abstract
A metallic shear damper is developed with the shape optimized by stress contour lines to mitigate the stress concentration, reduce the effect of hot welds, and improve the efficiency of energy consumption. The stress contour line is defined according to the J2 plasticity theory, where the micro units yield simultaneously. To demonstrate the effectiveness of the proposed shape-optimization method and the correctness of design formulas, detailed FEM models were built for nine dampers. And the influence of the axial loads was studied as well. Finally, seven damper specimens were fabricated and tested quasi-statically, including six optimized dampers and one with a rectangle shape as a comparison. Both numerical simulation and physical tests demonstrate that the distribution of plastic deformation is more uniform, and the accumulated equivalent plastic strain is reduced significantly, compared with the non-optimized damper. The proposed metallic shear damper has a good low-cycle fatigue capability and a stable energy-dissipation capacity. The stiffness and strength design equations predicted the specimen performance very well.
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