Abstract：A new type of lead-filled steel tube damper (LFSTD) was proposed in this study. Then, the configuration type, working mechanism and characteristics of LFSTD were introduced. To investigate the working behavior, energy dissipation capacity and failure characteristics of LFSTD, two specimens were designed for low-cycle repeated loading test and finite element simulations. The results show that LFSTD specimens have stable working performance and stable energy dissipation behavior; the hysteretic curve is symmetric and plump, its shape appears to be parallelogram, and the post-yielding equivalent damping ratio is about 0.45~0.50, indicating that LFSTD may possess powerful energy dissipation ability; for LFSTD, the yielding displacement is less than 1mm, the deformability is excellent, and the ductility ratio is greater than 20; appropriate weakening in the middle of steel tube can effectively control the stress distribution of LFSTD, make the deformation and energy dissipation concentrated in the middle of LFSTD, and prevent untimely failure of end connection of damper.
Keywords: lead-filled steel tube damper; metallic damper; damper; energy dissipation; multi-directional damper
