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Experimental research on unstiffened space tubular nodes withhigh-strength steel in 500 kV transmission steel tubular towers
Author(s): 
Pages: 489-494,503
Year: Issue:  4
Journal: Engineering Journal of Wuhan University

Keyword:  large crossing Hanjiang riverQ420 steel tubular towerunstiffened space K-nodes;
Abstract: 以国家电网公司应用Q420高强钢首批输电线路试点工程(500kV汉江大跨越直线塔主材采用Q420钢管)为背景,对3种类型的K型相贯节点进行了足尺试验研究.试验表明,在主管轴力较高时,节点的破坏以主管的局部塑性变形破坏为主,节点的破坏很大程度是由节点域主管的变形来表现的;K3型节点加劲板的设置,能有效地将两支管上的力均匀传给主管,从而改善节点支管与主管相贯线区域的受力性能,这就是K3型节点的实测承载力较K2型节点提高了25%的原因.借用中国钢结构设计规范中的计算方法进行了比较和推析,发现对K型高强钢节点简单地套用现有的简化公式和计算公式不可取.
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