Performance of Power Transmission Tower in PMA under Simulated Earthquake Ground Motion

Abstract eng:
Transmission towers play an important role in the operation of a reliable electrical power system that is considered as a lifeline system. The performance requirement of fully operational under damage-limitation earthquake is assigned to lifeline system in many current seismic codes to provide protection in the immediate post-earthquake period. Many studies and post earthquake investigations have revealed that the material and geometric non-linearity have a major effect on the ultimate strength of towers and the tower collapse is due to either spread of plasticity or premature buckling. Hence, transmission towers designed by equivalent static analysis method should be examined to check their performance under dynamic loading conditions. In this paper, a study of the performance of transmission tower under damage-limitation earthquake and rare earthquake derived from the seismic hazard analysis of Perth Metropolitan Area (PMA) is carried out. The results are compared with code provisions and recommendations for the design of transmission towers.

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