配置SMA的预应力自复位混合钢框架抗震性能研究  

Seismic performance of prestressed self-centring hybrid steel frames equipped with SMA

作　　者：张还阳 周绪红[1] 柯珂 贺修樟 ZHANG Huanyang;ZHOU Xuhong;KE Ke;HE Xiuzhang(College of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《建筑结构学报》2024年第8期34-43,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(52178111,51890902)。

摘　　要：为提升钢框架结构的抗震性能,将配置形状记忆合金(SMA)的预应力自复位混合节点引入钢框架结构。基于已有试验数据,采用有限元分析软件OpenSees建立能准确模拟节点滞回性能的简化模型。在此基础上,进一步建立考虑预应力索和SMA螺栓断裂失效的钢框架模型。通过静力推覆分析、非线性时程分析和易损性分析对配置SMA的预应力自复位混合钢框架的抗震性能进行评估。分析结果表明:混合钢框架结构呈现出三折线旗帜形滞回特征,并具有优良的自复位性能;相较于仅配置预应力索的自复位钢框架结构,混合钢框架结构具有更好的抗倒塌性能和自复位性能,其倒塌裕度比提高50%,损伤裕度比最大提高55%。基于等效单自由度体系进行非线性谱分析,证实了在结构中同时利用SMA螺栓和预应力索形成互补,可有效降低结构的非线性地震需求,从材料-结构一体化的视角揭示了混合钢框架的抗震机理。To enhance the seismic performance of steel frame structures,prestressed self-centring hybrid connections(SCHC)equipped with SMA were introduced into self-centring hybrid steel frames(SCHF).A simplified numerical model to simulate the hysteretic behaviour of the SCHC was developed based on the physical test data.Validated modelling techniques were employed to develop codified frame structures,considering the fracture behaviour of prestressed cables and SMA bolts.The seismic performance of the SCHF was assessed via static pushover analyses,nonlinear dynamic analyses and fragility analyses.The results indicated that the SCHF exhibited trilinear flag-shaped hysteretic features and excellent self-centring performance.Compared to the self-centring steel frames(SCF)equipped with prestressed cables only,the SCHF exhibited better collapse resistance performance and self-centring performance.The collapse margin ratio of the SCHF was increased by 50%,and the maximum damage margin ratio was increased by 55%.Nonlinear spectral analyses were conducted based on the equivalent single-degree-of-freedom systems,confirming the introduction of the complementary mechanism composed of prestressed cables and SMA bolts can effectively reduce the inelastic seismic demand,which revealed the seismic mechanism of the SCHF from the perspective of materialstructure integration.

关 键 词：自复位混合钢框架 形状记忆合金 材料-结构一体化 易损性分析 非线性谱分析 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程] TU391TU311.41