1 0 0 0 旧タコマナローズ橋の構造減衰特性に関する一考察
- 著者
- 米田 昌弘
- 出版者
- Japanese Society of Steel Construction
- 雑誌
- 鋼構造論文集 (ISSN:18809928)
- 巻号頁・発行日
- vol.13, no.52, pp.25-35, 2006
In this paper, the damping characteristics of the Old Tacoma Narrows Bridge which was collapsed in 1940 by wind is discussed based on the energy evaluation method. The damping values of the destroyed bridge are analyzed to grasp the contribution of dissipation energy from each construction components of the bridge. The structural damping is also discussed by using loss factors of the steel bridge which was identified by full scale measurements. From these calculation results, some pieces of useful information for the damping characteristics are obtained to reconsider the aerodynamic stability of the Old Tacoma Narrows Bridge.
1 0 0 0 OA 芸予地震における動態観測と来島海峡第一大橋センタースティロッド破断に対する検証
- 著者
- 古家 和彦 磯江 浩 帆足 博明 平野 茂
- 出版者
- 社団法人 日本鋼構造協会
- 雑誌
- 鋼構造論文集 (ISSN:18809928)
- 巻号頁・発行日
- vol.10, no.39, pp.131-141, 2003-09-30 (Released:2010-06-28)
- 参考文献数
- 8
Due to the Geiyo Earthquake in March 24th, 2001, center stay rods of the 1st Kurushimakaikyo Bridge(suspension bridge) were broken. They were designed to break in strong earthquake and work as safety valve of the structure. In order to evaluate the mechanism of the breakage of the rods, data from field measurement were processed using structural analysis, and it was confirmed that the broken rods worked as designed. It also was confirmed that forces acted to other unbroken rods in 2nd and 3rd Kurushimakaikyo Bridges were not large enough to affect their soundness. Through this experience, it was proven that field measurements and structural analysis can be effective tools not only for design but also for maintenance of structures.