Ultimate load-bearing capacity of reinforced concrete pylon under dynamic loading with bending and torsional moments

Abstract

The ultimate capacity of a compressed rectangular pylon was analysed by constructing the ultimate surface. The compressive force, bending moment and torsional moment caused by the peculiarities of the load application were taken into account. The calculations were carried out in a dynamic formulation, taking into account the non-linear behaviour of the structure. The classical plasticity model was used for the concrete and the elastic-plastic model for the reinforcement in the form of a bilinear diagram without hardening. The dynamic strength limit surface is used to evaluate the mechanical safety of the considered structure. In this case, in addition to the guarantee of the absence of complete destruction of the structure, the risk of material losses is taken into account, which can be prevented at the occurrence of one or another emergency situation. As a result, practical aspects of mechanical safety assessment and risk calculation algorithms, which can be used by designers and researchers, are presented on the example of an 8 m high pylon made of heavy concrete and reinforced with welded rebar cages. The work has prospects of generalisation to columns and pylons of complex shape.