针对特高压钢管输电塔挂线位置节点在极端荷载下的安全性,提出了挂线节点双侧挂线板协同受力的构造改进措施,并对比研究两种挂线节点的极限承载力与失效模式.通过足尺挂线节点处的承载力试验与有限元分析,比较挂线节点在单侧板受力、双侧板受力情况下的应力分布与承载能力,分析传力螺母与挂线板之间的合理初始间距.结果表明:双侧受力时两侧挂线板均发生弯曲破坏,受力形式更加合理,节点板应力分布更加均匀,挂线点的屈服承载力可以提升一倍以上,传力螺母与挂线板之间的合理初始间隙为2～4 mm.
Full-scale Test and Bearing Capacity Improvement for Conductor Hanging Joints of the UHV Steel Pipe Transmission Tower
In view of the safety of the conductor hanging joint of UHV steel pipe transmission tower subjected to extreme loading,this paper focuses on the measurements of the structural behavior improvement through modifying the co-operative work of two conductor hanging plates on both sides of the hanging joint.Two types of hanging joints are compared and studied regarding the bearing capacity and corresponding failure modes.Through the full-scale hang-ing joint tests and the Finite Element Analysis(FEA),the stress distribution and the bearing capacity of the hanging joint are compared under the condition of unilateral plate's load-bearing and bilateral plates'load-bear-ing.In addition,the reasonable initial gap between the force-transferring nut and the hanging plate is ana-lyzed.Results show that the reasonable initial gap between the force-transferring nut and the hanging plate is 2-4 mm,and bending failure will occur on both the bilateral plates.The stress distribution is more reasonable and the yield-bearing capacity of the hanging joint can also be increased twice as much as the design bearing capacity,which is of great significance to improving the safety of transmission tower and reduce the economic investment.
ultra-high voltage transmission towerhanging jointbearing capacityfull-scale experimentFEM simulationforce-transferring nut
NETL
NSTL
万方数据
