单边高强螺栓连接圆形CFDST柱组合节点抗震试验与分析

Seismic experiments and analysis of blind bolted connections to circular CFDST columns

为揭示地震作用下单边高强螺栓连接圆形中空夹层钢管混凝土(concrete filled double skin steel tube,CFDST)柱(简称“圆形CFDST柱”)组合节点的受力性能和破坏机理,文章开展了单边高强螺栓连接圆形CFDST柱组合节点的抗震试验,建立了此类组合节点的有限元分析模型,通过滞回曲线和破坏模式比较验证了有限元分析模型的准确性;对组合节点进行了深入的参数分析,讨论了钢材强度、楼板配筋率、端板厚度及螺栓预紧力等诸多参数对此类组合节点水平荷载-水平位移关系曲线的影响。研究结果表明:单边高强螺栓连接圆形CFDST柱组合节点具有较高的承载力、良好的延性及滞回性能,满足在高烈度地震区的结构抗震性能要求。

In order to investigate the seismic behavior and failure mechanism of concrete filled double skin steel tube(CFDST)column composite connections with high strength blind bolts,seismic experiments on this type of connections were carried out subjected to cyclic loads.FE models of this type of connections were established,and the accuracy of the models was verified in terms of P-Δhysteretic curves and failure modes.Furthermore,parametric analysis was conducted to discuss the influences of various parameters including steel strength,floor reinforcement ratio,end plate thickness and bolt pretension,etc.on P-Δrelation curves for this type of connections.The research results indicated that the CFDST column composite connections with high strength blind bolts possessed high bearing capacity,good ductility and hysteretic performance,which could accommodate the seismic demand in high-intensity regions.