In recent years,metallic bar dampers have been widely applied in structural vibration reduction due to their excellent energy dissipation capacity.To further enhance the mechanical performance of metallic bar dampers,this study proposes a double hourglass-shaped damper made of LYP160 low-yield-point steel,featuring a constant cross-section straight segment LYP160-double hourglass shaped steel damper(LYP-DHSD).To investigate the mechanical properties of LYP-DHSD under shear displacement,two LYP-DHSD specimens were designed.The hysteretic characteristics and fatigue performance of the specimens were studied through low-cycle reciprocating loading tests.A refined finite element model of LYP-DHSD was developed,and parameter analysis of the hysteretic performance was conducted with the outer diameter,inner diameter,and length of the constant cross-section straight segment as variables to further explore the stress pattern of LYP-DHSD under cyclic shear displacement.The results show that under cyclic shear displacement,LYP-DHSD achieves multi-section yielding and exhibits excellent load-bearing capacity,deformation ability,and stable energy dissipation performance,with fatigue performance meeting code requirements.Adjusting the inner diameter significantly influences the structure's load-bearing capacity,stiffness,and energy dissipation.Increasing the length of the constant cross-section straight segment reduces the load-bearing capacity,stiffness,and energy dissipation of LYP-DHSD.Additionally,increasing the inner and outer diameters improves material utilization efficiency initially,but it subsequently decreases.Modifying the length of the constant cross-section straight segment allows for adjustments in the plasticity distribution region of LYP-DHSD.Based on the analysis results,it is recommended that the ratio of the inner diameter to the outer diameter of LYP-DHSD be set between 0.375 and 0.625,and the ratio of the inner diameter to the length of the constant cross-section straight segment be set between 1 and 2.
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