ESTIMATION OF WIND SPEED FROM TRANSMISSION TOWER COLLAPSE BY TYPHOON FAXAI

DOI IR Open Access

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  • 令和元年台風15号通過時の送電鉄塔倒壊被害からの風速試算

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On September 9, 2019, Typhoon FAXAI left huge damage in eastern Japan, mainly in Chiba Prefecture. One of them was the collapse of two power transmission towers. In this paper, in order to estimate the wind speed when this damage occurs, the influence of the topography on the flow field around the collapse site of the transmission tower was investigated by numerical fluid analysis. Furthermore, the static structural analysis of the transmission tower was carried out by applying wind load based on the obtained flow field. As a result, at the wind direction angle of 146.25 degrees, local wind speed increased due to the topography, and the No. 79 tower began to collapse at a wind speed of about 40 m / s.

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