软钢阻尼器加固震损再生混凝土框架振动台试验

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

摘要:

对震损8层再生混凝土框架模型采用环氧树脂注胶并增设软钢耗能装置，通过振动台试验研究了震损框架加固后的地震响应以及软钢阻尼器的减震效果.基于试验结果对试验模型的震损特征、动力特性、加速度及位移响应进行分析，探讨了软钢阻尼器对主体框架的刚度及耗能贡献.试验结果表明：在强震激励下软钢阻尼器的滞回耗能效应能减小层间刚度退化，同时加速度响应能得到有效控制.软钢阻尼器沿楼层的屈服次序从中部楼层开始，逐渐向上部及底部楼层发展，中部楼层的软钢阻尼器变形增长较快，耗能较大.

关键词:减震加固; 震损; 再生混凝土框架; 振动台试验; 软钢阻尼器

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