In recent years, viscoelastic damping technology has been introduced into the vibration control for seismic performance enhancement of civil structures. In this study, a high-damping viscoelastic dampers (HDVED) is developed to solve the critical issues of VED for a middle-high temperature environments serving in civil structures and for low-frequency damping control under seismic action. To reveal the influence rule of frequency, temperature and displacement amplitude on the mechanical properties and seismic energy dissipation performance of HDVED, the dynamic mechanical properties of HDVED are experimentally investigated at different frequencies, temperatures and displacement amplitudes. The results show that HDVEDs exhibit excellent vibration damping and energy dissipation capabilities and environmental adaptability under middle-high temperature range and low frequency loading. Their dynamic mechanical properties and energy dissipation capabilities show strong dependence on frequency, temperature and displacement amplitude with obvious coupling effects. On this basis, a high-order fractional derivative model with equivalent internal variables of HDVED is proposed, and the validity and accuracy of the model are verified by tests. The results show that the proposed high-order fractional derivative model with equivalent internal variables can comprehensively describe the effects of excitation frequency, ambient temperature and displacement amplitude on the dynamic mechanical properties of HDVED. The model can accurately predict the mechanical properties of HDVED at different frequencies, temperatures and displacement amplitudes. It can provide an important basis for dynamic response analysis and design of viscoelastic damping structures.

low-frequency damping control  /  high-damping viscoelastic damper  /  dynamic mechanical property test  /  high-order fractional derivative model with equivalent internal variables