形状记忆合金混凝土柱动力特性试验研究

Experimental study on dynamic properties of SMA reinforced concrete columns

为了考查形状记忆合金(SMA)对结构构件动力特性的影响,将不同状态的SMA丝埋入到混凝土柱中,制成SMA混凝土柱,采用初始位移法测出SMA混凝土柱的自由振动衰减曲线,得到各SMA混凝土柱的频率和阻尼比。试验包括自由振动测试和通电振动测试两部分。对试验结果进行比较分析可知,SMA所处状态对混凝土柱的阻尼比影响显著;SMA相变过程中产生的回复力对混凝土柱的频率的影响较大。因此,可以利用SMA来改变混凝土构件或结构的动力特性,以有效控制结构振动。

The influence of shape memory alloys(SMAs)on vibration performances of concrete columns were studied through initial displacement method.In this study,SMA reinforced concrete columns were fabricated by embedding SMA wires with different phases.The experiment included two parts:one was the free vibration test;the other was the vibration test with current activation.The test results indicated that the state(or phase)of SMAs has evident influences on the damping ratio of the concrete columns;moreover,the recovery force generated during the SMA phase transformation has great influence on the frequency of the concrete columns.Therefore,SMAs could be utilized to change dynamic properties of concrete members or structures to control structural vibration effectively.