Research on Transmission Line Vibration Based on the Dynamic Response of Strain in Straight Tower Cross Arm Structure Under Wind–Ice Loads

Under ice and wind loads, transmission conductors undergo varying degrees of displacement, with larger displacements potentially causing direct damage to the transmission tower–line system and posing serious safety hazards. In a transmission tower–line system, the conductor’s vibration directly influences the crossarm strain response. Therefore, based on the connection characteristics between transmission conductors and tower crossarms, the crossarm strain response under ice and wind loads can be used to characterize the motion state of transmission conductors. However, the current research on the vibration of conductors based on crossarm strain dynamic responses still has gaps. In this study, we employ a finite element model of a transmission tower–line system and conduct numerical simulations of ice and wind loads under different working conditions using the controlled variable method, obtaining the variation patterns of the conductor’s displacement and crossarm strain. A functional relationship between the crossarm strain and conductor displacement response is established, and its applicability is further validated through numerical simulation analysis of the galloping of transmission conductors under icy conditions. This research provides technical support for monitoring the galloping state of transmission tower–line systems based on crossarm strain responses.