2. Introduction

The essential characteristic of cables is that they are flexible structures, whose mechanical analysis is non-linear because they are likely to undergo large displacement. They are affected during the pose operation, when arrows are adjusted to respect environmental constraints.

Subsequently, the cables can be animated by large-amplitude movements under the impulse of wind pressure, the fall of frost sleeves or, in the event of an incident, Laplace forces resulting from short circuit currents. They then exert much greater forces on their supports than static forces. This must be taken into account in the design of structures.

For old structures, which may be subject to increased short circuit intensities due to the extension of the network, it must be checked that reliability is still ensured.