新型筒式自复位SMA-摩擦阻尼器的减震性能分析

Analysis of Vibration Attenuation Performance of a NewCircular Tube Re-centering SMA-friction Damper

基于“多种耗能机制共同耗能”的思想,研制出一种新型筒式自复位形状记忆合金-摩擦阻尼器(Tube Recentering Shape Memory Alloys-Friction Damper,简称TRSFD)。利用改进的Graesser and Cozarelli模型和Bouc-Wen模型,建立TRSFD的恢复力模型,然后通过MATLAB中Simulink模块对其进行仿真分析,并将仿真结果与试验结果进行对比。最后,设置三种TRSFD布置工况,同时分别对未安装和不同布置工况下安装有TRSFD的四层钢框架结构进行弹塑性时程分析。结果表明:提出的恢复力模型仿真得到的滞回曲线和试验结果吻合较好,可以很好地反映TRSFD的滞回特性;布置形式会影响结构控制效果,TRSFD可有效减小结构的结构位移和残余位移,然而对速度和加速度的控制效果一般;大震作用下,TRSFD的安装能有效地将结构的反应控制在弹性范围内,达到较为理想的震动控制效果。

Based on the idea of“multiple energy dissipation mechanisms working together”,a new circular tube recentering SMA-friction damper(TRSFD)was proposed.The restoring force model of TRSFD was established by using improved Graesser&Cozarelli model and Bouc-Wen equations,and its numerical simulation was carried out by using Simulink module in MATLAB.Then,experimental results were compared with the numerical results.Lastly,three location cases of TRSFD were set up.Meanwhile,the elastic-plastic time history analysis of a 4-floor steel framework with or without TRSFD was carried out.The results show that the hysteretic curves obtained from the proposed restoring force model agree well with those from the experimental data.Therefore,this model can reflect the hysteretic behaviors of the TRSFD well.The arrangement of the TRSFD has an influence on the control effect of the structure.The TRSFD can effectively control the structural displacement and residual displacement,but it is incapable of controlling the velocity and acceleration.In the case of exceptionally serious earthquake,the installation of TRSFD can effectively confine the structural response in the elastic range,and reaches the ideal vibration control effect.