SMA—滚珠隔震支座框架试验研究

Experimental study on the frame structure with SMA-ball isolation bearings

为研究安装SMA-滚珠隔震装置的钢筋混凝土框架的动力特性及抗震性能,进行了自由振动和正弦稳态激振试验,并与滚珠隔震的框架及非隔震结构对比。模型采用足尺单层单榀钢筋混凝土框架结构,隔震支座采用滚珠隔震装置及SMA-滚珠隔震装置。结果表明,安装SMA-滚珠隔震装置的钢筋混凝土框架的基本周期延长,阻尼比大幅增加,隔震支座可以极大地减少地震加速度向上传递。增加SMA丝数量可以提高隔震支座的最大恢复力,从而提高隔震装置的耗能效果。SMA-滚珠隔震支座可以更好地应用于隔震工程中。

The free vibration and sine steady-state excitation experiment are carried out to investigate the dynamic characteristics and seismic performance of reinforced concrete frame with SMA-ball isolation devices. The comparison of dynamic characteristics and seismic performance among the base-fixed, ball isolation devices fixed and SMA-ball isolation devices fixed are performed simultaneously. A full-scale single reinforced concrete frame structure is built as a specimen model and ball isolation devices, and SMA-ball isolation devices are selected as isolation devices. The results of the test convey that the basic period of reinforced concrete frame with SMA-ball isolation device is extended, the damping ratio is greatly increased, and the isolation bearing can greatly reduce the seismic acceleration of frame. Increasing the number of SMA wire can improve the maximum restoring force of the isolation bearings, so as to improve the energy dissipation effect. SMA-ball isolation device can be applied to the isolation engineering effectively.