Authors: Zhipeng Zhai , Wei Guo , Zhiwu Yu , Chongjian He , Zhefeng Zeng
Abstract: In this paper, a new metallic structural fuse named S-shaped steel plate damper (SSPD) is proposed for seismic resilient application. The SSPD consists of two S-shaped plates fabricated by normal steel, which is convenient for fabrication, installation, inspection and replacement. In small and medium displacement, seismic energy is dissipated through flexural plastic deformation of the S-shaped arc plate. The deformation shifts from flexural behavior to tensile behavior in relative large displacement. To investigate the failure mode and seismic performance, a total of ten specimens were tested by monotonic and cyclic loading. The results indicate that the SSPD exhibits stable hysteresis loops, good energy dissipation, large deformation and ductility capacity; the damper has characteristics of large strength-mass ratio, secondary stiffness, over-strength coefficient and stable flexural-tensile behavior; the failure mode is dominated by fracture of end plate and squeezed indentation; the fatigue performance is more vulnerable in large displacement. Moreover, the mull-linear theoretical model was proposed to represent the SSPD, and the corresponding finite element model was established and validated by experimental results. Based on the numerical simulation, accuracy of theoretical derivation was verified, and improvements of SSPD were recommended. Finally, parametric studies considering different geometric dimensions were conducted, which reveals that the height-thickness ratio is crucial to the damper's stiffness and ductility. Practical formulas were suggested to facilitate the damper's design and application.
Keywords: Steel plate damper; Flexural-tensile behavior; Seismic resilience; Cyclic test; Finite element analysis