220kV双回输电线路钢管杆设计分析

Design and Analysis of Steel Tube Pole for 220 kV Double Circuit Transmission Line

根据220kV线路工程双回路钢管杆设计案例,采用承载能力极限状态设计方法,利用钢管杆设计软件(NSA)对其进行有限元分析计算,并利用有限元分析软件(ANSYS)进行对比分析,从而得出:钢管杆主杆控制工况为大风工况,以弯曲变形为主,延性好;ANSYS中的Shell181单元能有效模拟薄壁杆件受力状态,在解决许多收敛困难问题上,比低阶单元更有优势;采用多点刚性约束(MPC)的方法模拟钢管杆法兰连接,可以避免试件端部的应力集中现象;NSA计算结果与ANSYS分析结果比较吻合,计算误差在0.5%以内。

According to the design case of steel tube pole for 220kV double circuit transmission line,the methods of design and computing about limit condition of bearing capacity was adopted in this paper.The software of NSA steel tube pole design system was conducted upon analysis and calculation of steel tube pole,and the finite element analysis software ANSYS was used for comparative analysis.The results show that:control load case of the main pole of steel tube is extreme wind load.The main deformation of structure is bending deformation,and it has better ductility.The shell 181element in ANSYS can effectively simulate the stress state of thin-walled members,which has more advantages than the low-order element in solving many convergence problems.The MPC method is used to simulate the flange connection of steel tube,which can avoid the stress concentration at the end of the test piece;NSA calculation results are in good agreement with the ANSYS analysis results,and the calculation error is within 0.5%.