Abstract
Compared with normal transmission towers, the multiple-circuit tower was higher and heavier,it also had a longer crossarm. Response spectral method was taken to analysis the transmission tower-line’s response under earthquake.The results obtained from single tower and tower-line system under the earthquake were compared with each other，such as the tower members’ axial stresses and horizontal shears on supports .In addition,this paper discussed seismic load effects on the transmission tower-line system and some useful results were derived.
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