(1 南京工业大学土木工程学院， 南京 211816； 2 中能建江苏省电力设计院， 南京 211102；

3 河海大学土木交通工程学院， 南京 210098)

［摘要］探讨输电钢管杆横担抗弯强度及端部连接角焊缝抗弯强度的设计方法，开展3个相同规格设置不同加劲肋横担抗弯承载力特性试验、非线性有限元模拟和理论分析，探讨高压输电线路钢管杆截面为多边形的锥形横担抗弯承载力试验和设计理论。以锥度、径厚比为变化参数对锥形钢管横担进行一系列有限元模拟，并结合试验结果提出适合此类横担的抗弯承载力计算公式。研究结果表明：加劲肋对锥形钢管横担的极限承载力几乎没有影响，但能有效减小焊缝受力，避免焊缝的撕裂；随着锥度的降低，锥形钢管横担抗弯承载力降低，建议锥度取0-6；采用Q345钢材时，锥形钢管横担径厚比限值不应超过120。提出一个适用于锥形钢管横担抗弯承载力计算公式，并与有限元模拟值进行对比，可为工程设计提供参考。

［关键词］锥形钢管横担； 抗弯承载力试验； 设计理论； 有限元模拟； 抗弯承载力计算公式

中图分类号：TU392-3文献标识码：A文章编号：1002-848X(2017)02-0033-06

Test and design theory research on the flexural capacities of polygonal tapered cross arms for steel tube pole in the high voltage transmission line

Ding Yang1， Zhang Dachang1， Tan Lei2， Li Buhui3

（1 Department of Civil Engineering, Nanjing University of Technology, Nanjing 211816, China; 2 China Energy Engineering Group Jiangsu Electric  Power Design Institute, Nanjing 211102, China; 3 partment of Civil and Transportation  Engineering,  Hehai University, Nanjing 210098, China)

Abstract:The design methods of the flexural strength of tapered cross arms for steel tube pole and fillet weld connecting end parts were discussed and three tapered cross arms with same specifications but different stiffener were used to conduct tests including flexural strength characteristics test,  nonlinear finite element simulation and theoretical analysis, to discuss test and design theory on the flexural capacities of polygonal tapered cross arms for steel tube pole in the high voltage transmission line. A series of finite element simulations were carried out on the polygonal tapered cross arms for steel tube pole with the change parameters of the taper degree and diameter thickness ratio. The calculation formula of the flexural strength of the cross arm was put forward. The results show that the stiffener has almost no influence on the ultimate bearing capacity of tapered cross arms for steel tube pole, but it can effectively reduce weld stress and avoid weld tearing. With decrease of taper degree, flexural capacity of tapered cross arms for steel tube pole decreases and recommended taper degree is 0-6. With adoption of Q345 steel, limit value of diameter thickness ratio of tapered cross arms for steel tube pole should not be more than 120. A calculation formula was proposed to calculate flexural strength of tapered cross arms for steel tube pole and it can be compared with the finite element simulation, which can provide reference for engineering design.

Keywords:tapered steel cross arm joint; flexural capacity test; design theory; finite element simulation; flexural capacity calculation formula

*2014年江苏省科技厅前瞻性联合研究（BY2014005-11）。

作者简介：丁阳，硕士，助理工程师, Email: 15151812983@163.com。