送電用鉄塔部材の振動抑制への高減衰ゴムシートの利用

概要

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Some members of a transmission tower, which is constructed by a steel pipe or angle having a big slenderness ratio and a small initial stress, may vibrate locally due to a vortex-induced oscillation or an overall tower vibration. A type of truss frame brings about an ovaling vibration as a local vibration, which is an out-of-plane vibration of horizontal members of the tower body. Such local vibrations may cause connection-bolt loosening and/or fatigue problems of welded parts. This paper discusses a vibration control procedure of the local member, which utilizes High Damping Rubber (HDR) to increase the damping of each frame member. Some vibration suppression abilities of this procedure were confirmed by our vibration tests and simulation analyses of steel plate cantilever under free vibration. And some results of dynamic response analyses of one panel of an actual transmission tower in which some ovaling vibrations were recognized during typhoon MAEMI in 2003 indicated the high performance for vibration control of the local member.
一般社団法人日本建築学会の論文
2011-03-25