2021 年 67A 巻 p. 529-541
This paper proposes a method to evaluate fatigue strength under wind loads for clamped distribution line conductors. In our method, the fatigue strength is based on nominal stresses, which are defined by the resultant of the axial stress and the bending stress. The bending stiffness of conductors to calculate the bending stress is estimated by a simple equation derived from a finite element analysis, which is considering effects of the tension and the friction between wires. Our method is verified by fatigue tests assumed the real behavior of cyclic stresses on clamped conductors under wind loads. The results of the tests show the potential of using the nominal stress range to evaluate the number of cycles to failure of a wire and a conductor.