SMA螺旋弹簧消能支撑对框架结构的减震控制研究

Study on Aseismic Control of Frame Structure with SMA Helical Spring Energy Dissipation Brace

利用形状记忆合金(SMA)的超弹性效应,提出了一种由SMA螺旋弹簧和普通钢杆组成的新型消能支撑。通过拉伸试验给出了SMA螺旋弹簧在往复荷载下的力位移关系模型。建立了一个基于新型消能支撑的二层钢框架模型,分析其在不同地震作用下的动力响应,并与无控和装有普通钢弹簧支撑的情况进行对比。结果表明,SMA螺旋弹簧消能支撑可以有效地减小结构的动力响应,与普通钢弹簧支撑相比,新型消能支撑能够提供更好的减震效果。

A new type of energy dissipation brace was proposed,which consists of SMA helical springs and ordinary steel wires. The proposed brace can adequately use the superelasticity of shape memory alloy. Through the tensile tests of SMA helical springs,a displacement-force relatioship model of the SMA helical springs under cyclic loading was presented. A two storey steel frame model with the new energy dissipation brace was established. Then the dynamic responses of the steel frame under different earthquake loads were calculated,and the results in case of the no-brace and the ordinary steel spring brace were also obtained respectively for comparisons. The numerical results show that the SMA helical spring energy dissipation brace can effectively reduce the dynamic responses of the frame structure. Compared with the ordinary steel spring brace,the new energy dissipation brace can provide better damping effect through depressing the responses of the frame structure under earthquake loads.