舒赣平  廖述江  孟宪德    （东南大学土木工程学院  南京 210018）

  李新华    （淮海工学院 222005）

[提要]  预应力网架能较好地满足大空间、重荷载结构的要求，但其下弦节点比较难处理。现根据工程实践提出了一种新的节点——开孔焊接空心球节点，并用弹塑性有限元方法和模型试验研究了其承载能力及影响承载能力的因素，得出了一些对设计有益的结论。
[关键词]  开孔焊接空心球节点  弹塑性有限元  预应力网架  组合网架

Prestressed space grid developed in recent years has good performances, but its bottom chord joint is hard to dispose. A new type of joint-welding hollow sphere joint with holes( WHSJH)is put forward, its load carrying capacity and influencing factors are researched by means of the finite element method and full scale model experiments. Some conclusions beneficial to design are drawn satisfactorily.
Keywords:  welding hollow sphere joint; holes; elastic-plastic finite element analysis; prestress; composite; space grid