新型耗能增强型形状记忆合金阻尼器减震性能研究

首先通过形状记忆合金的材性试验研究了其超弹性变形性能,并将其等效拟合为多线性模型,得到其计算参数.然后,提出了一种新型耗能增强型SMA阻尼器,说明了其构造,阐述了其工作原理和设计要点,推导了阻尼器的恢复力模型.最后通过有限元程序对设置该阻尼器的多层钢框架、对角设置SMA拉索的多层钢框架、普通钢框架进行了地震时程分析,对比研究了该阻尼器的消能减震能力.结果表明该阻尼器的滞回环非常饱满,耗能能力强,大震下对结构的位移和层间位移角控制效果显著.

Seismic Performance Study on New Enhanced Energy Dissipation SMA Damper

Firstly, the super-elastic deformation behavior of shape memory alloy was studied through material test, and its stress-strain curves were equivalent to multi-linear model to obtain its calculation parameters. Then, a new enhanced energy dissipation SMA damper was proposed, with its structure, working principle, design methods, and restoring force model also being introduced and elaborated. Finally, a total of three analytical models were established including a conventional steel frame, a steel frame setting diagonal SMA cables and a steel frame installing new SMA damper. Through the seismic time-history analysis, the seismic performance of these three models was comprehensively investigated. The results show that the hysteresis loop of the new SMA damper is full and the new SMA damper performs perfect energy dissipation capability. Moreover, the proposed SMA damper effectively suppresses structural displacement response and inter-story drift angle response under rare earthquakes.