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Indexed by:会议论文

Date of Publication:2008-03-10

Included Journals:EI、CPCI-S

Volume:6928

Key Words:shape memory alloy; superelasticity; damper; seismic response control; passive energy dissipation system

Abstract:Energy dissipation technique, relying on the absorption and dissipation of big amount of energy by devices, provides a very effective passive method of protecting structures from the hazard of earthquakes. An innovative hybrid damper combining friction device with superelastic shape memory alloy (SMA) wires was proposed. The most important property of the damper is the integration with stable energy dissipation capacity mostly provided by the friction device and re-centring feature profited from the superelastic pre-tensioned SMA wires. To investigate the mechanical behaviors of the damper as a function of pre-displacement, displacement amplitude and loading frequency, cyclic tensile tests on a scale model under various loading conditions were conducted. The effectiveness of the damper to reduce the seismic vulnerability of structures is assessed through nonlinear time history analysis on a steel frame with the innovative dampers subjected to representative earthquake ground motions. The experimental and analytical results show that the hybrid SMA damper has both the stable energy dissipating and recentring features with the hysteretic loop under cyclic loading-unloading, and it is effective in reducing the seismic response of structures.