Research on Seismic Performance of Composite Energy-Dissipation Dampers with Different Combinations

To meet the higher requirements of performance-based seismic design and incorporate the concept of industrialized prefabrication， three new types of composite energy-dissipation dampers are proposed by integrating U-shaped dampers （UDs） with slitted steel plate dampers： single-stage yielding composite energy-dissipation damper （SSYCD）， double-stage yielding composite energy-dissipation damper （DSYCD）， and reinforced double-stage yielding composite energy-dissipation damper （RDSYCD）. Using the finite element software ABAQUS， a comparative study on the seismic performance between the traditional UD and the three new composite energy-dissipation dampers was conducted， analyzing the differences in their the hysteresis curves， skeleton curves， energy dissipation capacity， and equivalent viscous damping coefficients. The results showed that， compared to UD， SSYCD significantly improved the initial stiffness and energy dissipation capacity of the damper on the premise of reducing the steel consumption by 28.20%， with increases of 150.16% and 250.57%， respectively； DSYCD achieved the intended double-stage yielding working mechanism with relatively low initial stiffness and energy dissipation capacity； RDSYCD achieved the intended double-stage yielding working mechanism， and when the steel consumption was similar to that of SSYCD， its initial stiffness， ultimate bearing capacity， and energy dissipation capacity increased by 6.28%， 44.55%， and 11.03%， respectively， compared with SSYCD.