He considers that the unit length self-weight load of the overhead line is distributed uniformly along the line suspension curve,change at the point acted by the curve load is not continuous(with s.

Through analyzing the instantaneous(distribution) of the bending moment during the course of dynamic response,the elastic effects on the deformation(mechanism) of the curved cantilever beam were discussed meticulously.

The calculation program design of the overstep equation set for obtaining the suspended chain curve;

Aiming at solving the serious problem resulting from the displacement function of the geometric non-linear bent cantilever and its great error ,the author has the function deduced from approximate calculation and Galerkin integration.