Method for computing stress of nonlinear flexible components for running of electric transmission line tower

The invention discloses a method for computing stress of nonlinear flexible components for running of an electric transmission line tower. According to the method, firstly, a structure model and a material model are selected according to a structure and a material of the tower, and a rigidity matrix, a node displacement array and a node load array of a tower component unit are generated separately according to each component unit and node displacement of the tower; then, acquired stress matrix and displacement matrix are modified by use of a finite incremental method and a newton iteration method; and finally, Lagrange interpolation is performed on a strain matrix and the displacement matrix of the tower so as to obtain the load and displacement of the whole tower to acquire the stress of any point in the tower structure. The stress of the nonlinear flexible components of the electric transmission line tower is effectively computed directly by use of a mathematical method, so that the method provides important scientific basis for structural security evaluation of the tower.