Techno Press

Structural Engineering and Mechanics   Volume 11, Number 3, March 2001, pages 273-286
Shaking table study of a 2/5 scale steel frame with new viscoelastic dampers
K.C. Chang, M.H. Tsai(R.O.C.) and M.L. Lai(U.S.A.)

Abstract     [Full Text]
    Viscoelastic (VE) dampers have shown to be capable of providing structures with considerable
additional damping to reduce the dynamic response of structures. However, the VE material appears to be
sensitive to the variations in ambient temperature and vibration frequency. To minimize these effects, a
new VE material has been developed. This new material shows less sensitivity to variations in vibration
frequency and temperature. However, it is highly dependent on the shear strain. Experimental studies on
the seismic behavior of a 2/5 scale five-story steel frame with these new VE dampers have been carried
out. Test results show that the structural response can be effectively reduced due to the added stiffness
and damping provided by the new type of VE dampers under both mild and strong earthquake ground
motions. In addition, analytical studies have been carried out to describe the strain-dependent behavior of
the VE damper. The dynamic properties and hysteresis behavior of the dampers can be simulated by a
simple bilinear model based on the equivalent dissipated energy principle proposed in this study.
Key Words
    VE damper; hysteresis; energy dissipation; shaking table study.
K.C. Chang and M.H. Tsai, Department of Civil Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
M.L. Lai, 3M Company, St. Paul, Minnesota, U.S.A.

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