500 kV变电构架中刚、柔性法兰的有限元分析

FE Analysis of Rigid and Flexible Flanges in 500 kV Substation Trusses

应用有限元软件ANSYS,对500 kV变电构架中刚、柔性法兰在拉弯荷载作用的应力分布和变形特点进行非线性数值分析,将螺栓最大拉力的有限元结果与《架空送电线路杆塔结构设计技术规定(》DL/T5154—2002)结果进行对比,发现大偏心受拉时规范采用的旋转轴位置还有待进一步研究,建议柔性法兰螺栓受力修正系数m值取为0.75;实际工程中在设计刚、柔性法兰时,至少应留25%的安全裕度。从有限元计算的螺栓最大拉力、法兰的应力云图和局部变形图同样看出,有限元分析结果准确可靠,和试验研究结果及规范比较吻合。

ANSYS is used to perform nonlinear numerical analysis of stress distribution and deformation of rigid and flexible flanges in 500 kV substation trusses under tension and bending loads. By comparing finite element results of maximum bolt tension and results based on Technical Requirements for Overhead Transmission Line Pole and Tower Structural Design （DL/T 5154-2002）, it is found that under large off-center tension loads, the location of rotation axis in the Requirement requires further study. It is recommended that the value of flexible flange bolt load correction coefficient m should be 0.75, and in practices, 25% safety margin should be used in rigid and flexible flange design. Maximum bolt tension and flange stress contour maps, as well as local deformation plots using FE calculation also indicate that FE results are correct and correlate well with experiment results and technical requirements.