圆钢管搭接节点延性分析

Ductility analysis of overlapped joints in circular steel tubes

根据圆钢管搭接节点静力和滞回性能试验,对特定几何参数搭接节点的延性和塑性耗能能力进行了量化.由延性系数分析可知除SJ3的延性系数较低外其余搭接节点试件具有较好的延性;承受反复荷载作用时与单调加载时相比节点变形率低.由承载力储备分析可知反复荷载作用下试件的承载力储备较低,而静力荷载作用下试件的承载力储备均较大,说明承受反复荷载作用时节点的承载力储备降低.对于搭接节点τ(腹杆与弦杆壁厚比值)值较大时,节点承受反复荷载时的延性较差.由搭接节点耗能分析可知,总体看来各试件具有良好的耗能能力.

On the basis of static and hysteretic performance tests of overlapped joints in circular steel tubes, the energy consumption capacity of the joints due to their ductility and plasticity was quantized. It was known from the analysis of ductility coefficient that all specimens of overlapped joints other than SJ3 one possessed a better ductility and lower deformation rate of the joints under repeated action of loads compared to that under monotonic loading. It was also known from the analysis of bearing capacity reservation that the latter was lower with the specimens under the action of repeated loading and higher, however, under static loading, thus illustrating that repeated loading would decrease the bearing capacity reservation of the joint. For the overlapped joint with greater r （ratio of flank rod thickness to chord rod thickness）, the ductility of the joint subject to repeated loading was more deteriorated. It was finally known from energy consumption analysis of joints that, generally speaking, all specimens possessed good capability of energy consumption.