Study of the Dynamic Response Law of Multi-form Unstable Rolling Stones Impacting Transmission Towers

This study focuses on ultra-high voltage transmission lines passing through mountainous areas, analyzes the dynamic response characteristics and influencing factors of transmission towers in the event of landslides or collapses causing rolling stones. A simulation model of angle steel towers is established using LS-DYNA software to comprehensively assess the potential impacts of rolling stone mass, size, and velocity on the tower's dynamic response. The results reveal that the stress experienced by the tower base is closely related to these parameters of the rolling stone. With a constant rolling stone velocity, an increase in mass leads to higher stress on the base. Stones with different roundness values induce varying peak stress levels. Rolling stones with different roundness induce varying stress peak values. Moreover, impacts from rolling stones of different roundness lead to differences in the location and magnitude of the stress peaks on the base. When the rolling stone $Sp$ approaches 1, the impacted area of the base significantly increases, potentially causing direct damage to the base. Overall, this study highlights the impact of rolling stones with varying roundness on steel towers. Through the LS-DYNA software simulation model, the dynamic response characteristics of transmission lines in mountainous areas when impacted by rolling stones have been comprehensively evaluated.