Shaking Table Test of Earthquakedamaged Recycled Aggregate Concrete Frame Retrofitted with Steel Dampers

Abstract:

An earthquake-damaged eight-storey recycled aggregate concrete frame model was retrofitted by using epoxy injection and steel energy dissipation devices，then shaking table test was conducted to investigate earthquake response of the retrofitted frame and damping effect of the steel dampers. Based on the test results, damage observation, dynamic characteristic, acceleration and displacement response of the test model were analyzed, furthermore, stiffening and damping effects contributed by the steel dampers to the primary frame were discussed. The test results indicate that inter-storey stiffness degradation can be reduced by hysteretic damping effect of the steel dampers, and acceleration response can be effectively controlled under strong earthquake excitations. Yielding sequence of the steel dampers along the floors starts from the middle floor towards the upper and lower floors. Deformations of the steel dampers installed at the middle floors increase greatly, dissipating a large amount of input seismic energy.

Key words:retrofitting for seismic response reduction; earthquake-damaged; recycled aggregate concrete frame; shaking table test; steel damper