中国电机工程学报2024，Vol.44Issue(10)：4157-4166,封3,11.DOI:10.13334/j.0258-8013.pcsee.230141
脱冰工况下特高压输电铁塔地线横担受力特征及破坏模式
Mechanical Characteristics and Destroyed Modes for Cross-arm Supporting Ground Wires of UHV Transmission Tower Under Ice Shedding
摘要
Abstract
Affected by the severe accreted ice exceeding design values and impact of ice shedding,the cross-arm supporting ground wires of a typical UHV tensioned transmission tower are bent and damaged.The general finite element software ANSYS is used to establish the finite element model of the ground wire-tensioned tower-fitting string system.Through the geometric nonlinear dynamic time-history analysis under ice shedding cases,the longitudinal unbalanced tension,the vertical load acting on the suspension points as well as the corresponding impact factors are determined for different accreted ice thickness.A refined finite element model of the cross-arm supporting ground wires is established by using the beam and truss element,and the peak load of the ice shedding case is applied to the suspension point.Stress contour of the members of the cross-arm is obtained,and the member location firstly occurred buckling failure is determined.The bending stress of the main member at the second segment is 37.9%of the axial compressive stress,and the influence of bending moment cannot be ignored.The full-scale test of the cross-arm supporting ground wires under the conditions of 30 mm accreted ice and 100%ice shedding ratio at the big-number side is completed.The strain variation trends for typical members during loading are revealed.The original failure location and the failure mode are inversed by full-scale test.The experimental failure mode is basically consistent with the finite element simulation results and the field failure mode.关键词
脱冰/有限元仿真/真型试验/应变/不平衡张力/杆端弯矩Key words
ice shedding/finite element analysis/full-scale test/strain/unbalanced tension/bending moment at the end分类
信息技术与安全科学引用本文复制引用
杨风利,李清华,邵帅,李茂华,朱彬荣..脱冰工况下特高压输电铁塔地线横担受力特征及破坏模式[J].中国电机工程学报,2024,44(10):4157-4166,封3,11.基金项目
国家电网有限公司科技项目(5108-202218280A-2-222-XG).Science and Technology Project of State Grid Corporation of China(5108-202218280A-2-222-XG). （5108-202218280A-2-222-XG）
