SMA支撑加固非延性RC框架的抗震性能研究

Study on seismic performance of non-ductile RC frames retrofitted by SMA braces

形状记忆合金(Shape Memory Alloy,SMA)支撑具有良好的自复位能力和能量耗散能力,在土木工程结构的抗震加固中具有很好的应用前景。本文针对SMA支撑加固非延性RC框架的抗震性能进行了研究。采用有限元软件Open Sees建立了一榀3层非延性RC框架的数值模型,对其进行了SMA支撑加固前后的非线性动力时程分析。对大震作用下加固前后结构的最大层间侧移角和残余层间侧移角进行了比较,并研究了SMA支撑的滞回性能。研究结果表明,SMA支撑可以有效地耗散地震能量,能够显著地减小非延性RC框架在强震作用下的结构响应。

Given their excellent self-centering and energy-dissipating capabilities,shape memory alloy( SMA) braces can be used as a promising approach to retrofit seismically vulnerable structures in the field of civil engineering. This paper investigates the seismic performance of non-ductile reinforced concrete( RC) frames retrofitted by shape memory alloy( SMA) braces. The numerical model of a 3-story non-ductile RC frame was developed using finite element software Open Sees,and nonlinear time-history analyses were performed on the RC frame prior to and after retrofit by the addition of SMA braces. The seismic performances of the structure before and after retrofit were compared through nonlinear dynamic analyses,and the hysteresis performance of the SMA braces were studied. The results show that the SMA braces in the non-ductile RC frame can dissipate the earthquake energy effectively,and significantly reduce the seismic responses of the non-ductile RC frame under the strong earthquake ground motions.