石川 義幸*1・青野 翔*1・谷 翼*1・野口 裕介*2・隈部 敦史*2・渡辺 征晃*2・長谷川 達也*3・木村 雄一*4

2011年3月に発生した東北地方太平洋沖地震を機に長周期・長時間地震動への関心が高まっている。その対策技術として, 超高層建物の屋上に設置する多段振子型制振装置「T-Mダンパー」を開発したが, 近年設計時に想定する地震動のレベルが大きくなり, より厳しい条件下での装置の使用が予想される。そこで専用のオイルダンパーの筐体に3Gの鉛直方向の慣性力に相当する錘を付加しての圧縮試験を実施した。その結果, 定格軸力の1.3倍の600kNまでオイルダンパー筐体が座屈, 降伏しないことを確認した。


*1 技術センター 都市基盤技術研究部 防災研究室
*2 設計本部 構造設計第三部
*3 設計本部 構造計画部
*4 設計本部

Soundness Verification of Long Stroke Oil Damper for T-M Damper against Compressive Force

Yoshiyuki ISHIKAWA*1, Sho AONO*1, Tsubasa TANI*1, Yusuke NOGUCHI*2, Atsushi KUMABE*2, Masaaki WATANABE*2, Tatsuya HASEGAWA*3 and Yuichi KIMURA*4

The T-M Damper, a multi-stage pendulum-type vibration control device to be installed on the roof of high-rise buildings, has been developed as a countermeasure technology for long-period, long-duration seismic motion, which has been attracting much attention since the Great East Japan Earthquake that occurred in March 2011. In recent years, the level of seismic motion to be considered in design assumption has increased, and it is expected that the equipment will be used under more severe conditions. Therefore, a compression test was performed by adding a weight equivalent to the vertical inertial force of 3G to the housing of the dedicated oil damper. As a result, it was confirmed that the oil damper housing did not buckle or yield up to 600 kN, 1.3 times the rated axial force.

Keywords: TMD for earthquake, oil damper, compression test, buckling safety, long period ground motion

*1 Disaster Prevention Research Section, Urban Engineering Research Department, Taisei Advanced Center of Technology
*2 Structural Engineering Department III, Design Division
*3 Structural Planning Department, Design Division
*4 Design Division