Bae C., Cho C., Yang K., Koo J.

Energy dissipation devices can be considered as an alternative for the performance enhancement of existing structures based on the strengthened seismic design code. In this study, the seismic response mitigation effect of friction dampers is investigated through the shaking table test of a full scale 3 story building structure. Frist, the bilinear force-displacement relationship of a structure- brace-friction damper system and the effect of brace-friction damper on the increase of frequency and damping ratio are identified. Second the frequency, displacement, and torque dependences are investigated using harmonic load excited small friction damper. Finally, the shaking table tess are performed for the full scale building. System identification results using random signal excitation indicate that brace-friction damper increases structural damping ratio and frequency, and El Centro earthquake test show that brace-friction damper reduces the peak displacement and acceleration significantly. In particular, the damping effect due to friction damper becomes obvious when the structure is excited by more intensive load causing frequent slippage of the friction dampers.