Analysis of failure mechanism of concrete pole based on finite element extended method

Concrete pole plays an important role in the distribution network, which is prone to degradation under the influence of the environment. Fracture failure accident is mainly caused by structural deterioration, including damage deterioration of concrete structure under stress overload state and deterioration of concrete material itself. Because the tensile strength of the concrete structure is much less than the compressive strength, it often shows cracking and deterioration. This paper first analyzes the deterioration process of concrete electric poles, and then constructs a damaged model of concrete electric poles according to the finite element method. It is found that the tensile strength of concrete electric poles is maximum at 2.4m, and the compression is maximum at 2-6m. Finally, the main factors leading to the failure and deterioration of concrete electric poles are studied based on the finite element extended method. The shallower the crack depth and the higher the concrete strength, the stronger the fracture resistance and bearing capacity of concrete poles. In addition, the annular crack at the height of 2.4m is the most likely to spread.