Anton V. Tanasoglo,¹ Igor M. Garanzha,¹ Anna R. Fedorova,¹ Nikolay I. Rumyantsev<sup>1

1</sup>Moscow State National Research University of Civil Engineering (Russian Federation)

Abstract

This article presents theoretical and experimental studies of the stress-strain state (SSS) of overhead power line (OHL) supports under emergency loads. Numerical studies have shown that the emergency load on a support, considering the line's operation as a single structural system, is 25% lower than the load regulated by currently applicable regulatory documents. Experimental studies of the dynamic behavior of power grid structures revealed that the supporting forces from current-carrying wires and ground wires influence the oscillation periods of intermediate support structures. Monitoring the dynamic behavior of steel overhead line supports based on refined dynamic loads and impacts allows for an assessment of the load-bearing capacity of double-circuit anchor-angle and intermediate supports during operation. The developed theoretical and experimental foundations enable the design of operationally reliable OHL support structures and the assessment of the residual load-bearing capacity of operating power grid structures within a single electrical network, taking into account refined dynamic loads. Numerical studies have shown that the emergency load on the support, considering the line's operation as a single structural system, is 25% lower than the load specified by currently applicable regulations. Dynamic components exceed the forces of the corresponding static components during emergency operation modes due to wire and cable breakage by 10% to 30%. Experimental studies of the dynamic behavior of power grid structures have shown that the supporting forces from current-carrying wires and ground wires influence the oscillation periods of support structures.