Seismic response of large crossing transmission tower-line system subjected to near-fault ground motions

Dynamic characteristics of a large crossing transmission tower-line system (LCTTL) are analyzed. The seismic responses of a large crossing transmission tower-line system subjected to near-fault pulse-like ground motions and ordinary ground motions are compared. The characteristics of responses caused by near-fault pulse-like ground motions are presented. It is shown that the seismic responses of LCTL induced by near-fault pulse-like ground motions are severer than the responses subjected to ordinary ground motions. The amplitude of seismic responses increases with the pulse period of near-fault pulse-like ground motions. An equivalent pulse model is introduced to seismic response evaluation of LCTL. The results demonstrate that the equivalent pulse model can capture the important response characteristics of the near-fault records. The application of equivalent pulse model in seismic responses analysis of LCTL can augment the number of near-fault record set.