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为了研究覆冰荷载作用下转角塔的稳定性,以某电力设计院设计的220 kV干字型耐张转角塔为工程背景,利用数值分析软件建立铁塔的有限元分析模型。对结构进行特征屈曲分析,得到了铁塔的特征值屈曲模态,然后采用增量加载模式研究了不同覆冰厚度情况下该塔非线性稳定性,得到不同覆冰厚度下塔顶位移以及各杆件的受力情况。结果表明,覆冰和风作用下导地线的角度荷载对转角塔起控制作用,整体表现为压弯失稳破坏。给出了转角塔的失稳模式和破坏机理,研究成果可为转角塔抗冰灾设计提供有价值的参考。
In order to study the stability of the corner tower under the icing load, taking the 220 kV dry-type Torsion Corner Tower designed by a power design institute as the engineering background, the finite element analysis model of the tower was established by numerical analysis software. The characteristic buckling analysis of the structure is carried out, and the eigenvalue buckling mode of the tower is obtained. Then, the nonlinear stability of the tower under different ice thickness conditions is studied by incremental loading mode. Pieces of force situation. The results show that the angle load of the ground wire under the action of icing and wind plays a controlling role on the corner tower, and the overall performance is the buckling failure of the cornering tower. The instability mode and failure mechanism of corner tower are given, and the research results can provide valuable reference for anti icing design of corner tower.