方钢管竖向插板加强T型节点轴向滞回性能研究

来源期刊:中南大学学报(自然科学版)2021年第5期

论文作者:常鸿飞 周绿元 胡磊 周金 夏军武

文章页码:1591 - 1601

关键词:方钢管;竖向插板加强;T型节点;轴向滞回性能;有限元分析;试验研究

Key words:square tubular; vertical inner plate reinforced; T-joint; axial hysteretic behavior; finite element analysis; experimental study

摘    要:为研究方钢管竖向插板加强T型节点(IPT)轴向滞回性能,对2组竖向插板加强T型节点进行轴向往复加载试验,并与未加强(URT)和覆板加强节点(DPT)进行对比,最后对插板尺寸和构造进行有限元参数分析,提出插板构造的优化建议。研究结果表明:竖向插板加强节点的轴向滞回性能较优,IPT试件的承载力和耗能能力比URT试件的承载力和耗能能力高1倍以上;支管与主管宽度比越小,竖向插板对试件承载力提升越明显,支管与主管宽度比越大,竖向插板对耗能能力的提升越明显;IPT试件的累计耗能能力和拉压对称性比DPT试件的更好。插板长度是影响IPT节点轴向滞回性能的关键参数,插板中空处理不会削弱节点的承载及耗能能力。

Abstract: In order to study the axial hysteretic behavior of vertical inner plate reinforced square tubular T-joints(IPT), two groups of vertical inner plate reinforced square tubular T-joints were tested under axial cyclic loading, and compared with the specimens of unreinforced(URT) and doubler-plate reinforced(DPT) joints. Finally, the effect of dimension and configuration of vertical inner plate was investigated by finite element analysis, and the configuration suggestions for the inner plate were proposed for design reference. The results show that the axial hysteretic behavior of the IPT specimens is superior to the corresponding URT specimens, and the bearing capacity and energy dissipation capacity of the IPT specimens are more than one times than that of URT specimens. The increase of bearing capacity is more significant for specimens with low brace-to-chord width ratio, and the vertical inner plate is more effective to increase the energy dissipation capacity for specimens with high brace-to-chord width ratio. The maximum energy dissipation capacity and the tension and compression symmetry of IPT specimen are higher than that of DPT specimen. The length of inner plate is proved to be the key parameter. The opening on the inner plate will not weaken the bearing and energy absorption capacity of IPT joints.

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