内管设PBL肋型圆套圆中空夹层钢管混凝土柱-钢梁节点滞回性能分析

Analysis of hysteretic behavior of concrete-filled steel tubular column-steel beam joints with PBL rib-shaped circular sleeves in inner tubes

针对内管设PBL肋型圆套圆中空夹层钢管混凝土柱-钢梁节点的抗震性能研究,本文设计了5根节点试件,进行了低周往复荷载试验。以肋长、空心率、轴压比为主要变化参数,研究此类节点的破坏形态、破坏机制、滞回曲线、骨架曲线以及刚度退化、强度退化、延性、耗能能力等性能。试验结果表明:内管设置PBL肋的节点表现出良好抗震性能,但随着肋长的增加,承载力提高不明显,延性和耗能能力有一定提高,强度退化影响不大;随着空心率增大,承载力与延性略有降低,对强度退化、刚度退化、耗能能力影响不大;使用有限元软件ABAQUS建模计算得到的荷载-位移曲线与本文试验结果总体基本符合。为进一步参数分析和机理研究提供了可靠的基础。

Aimed at the seismic behavior of PBL ribbed round hollow circular sandwich steel tube concrete column-steel beam joints,five joint specimens were designed and the low cycle reciprocating load test was carried out.Based on the rib length,hollow ratio and axial compression ratio,the failure modes,failure mechanism,hysteresis curve,skeleton curve,stiffness degradation,strength degradation,ductility and energy dissipation capacity of such joints were studied.The results of this test show that the nodes with PBL ribs in the inner tube show good seismic performance,but with the increase of rib length,the bearing capacity is not improved obviously,the ductility and energy consumption capacity are improved,and the intensity degradation has little effect;The hollow rate is increased,the bearing capacity and ductility are slightly reduced.The strength degradation,the stiffness degradation and energy dissipation capacity are not greatly affected.Finally,the load-displacement curve calculated by the finite element software ABAQUS model is basically consistent with the experimental results in this paper,which provides a reliable basis for further parameter analysis and mechanism research.