RESPONSE CHARACTERISTICS OF HIGH-RISE BUILDINGS WITH STUD-TYPE VISCOELASTIC DAMPERS AGAINST LONG-PERIOD GROUND MOTIONS, AND PERFORMANCE EVALUATION TESTS
Research interest on structural vibrations induced by long-period ground motion has increased in recent years. When exposed to
long-period ground motion, high-rise buildings with long natural periods tend to oscillate continuously for a long time. Accordingly,
the use of passive control devices supplements the structural damping thereby mitigating the vibration of high-rise buildings. Among
the types of passive control devices, a stud-type viscoelastic (VE) damper holds an advantage in space utilization, and it can handle
small to large earthquakes. However, there is a general concern that the characteristics of viscoelastic dampers decrease due to
repeated oscillations caused by long-period ground motion. The authors address this matter by investigating experimentally and
analytically the properties of stud-type VE dampers employed to a high-rise building subjected to long-period ground motion. The
random damper deformation waveform was first determined from the analysis of the building subjected to earthquake, and its
equivalent-sinusoidal deformation waveform was then calculated and verified through experiment. Using the equivalent-sinusoidal
waveform, proposed parameters defining the VE damper performance were calculated.
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