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発表 Earthquake-induced Behavior of a Prestressed Concrete Cable-stayed Bridge

作成年度 1996年度
論文名 Earthquake-induced Behavior of a Prestressed Concrete Cable-stayed Bridge
論文名(和訳) Earthquake-induced Behavior of a Prestressed Concrete Cable-stayed Bridge
論文副題
発表会 12th U.S.-Japan Engineering WorkshoP
誌名(No./号数)
発表年月日 1996/10/29 ~ 1996/10/30
所属研究室/機関名 著者名(英名)
鹿島建設㈱山野辺 慎一(YAMANOBE Sinichi)
構造研究室中井 健司(NAKAI Kenji)
構造研究室二宮 嘉朗(NINOMIYA Yoshio)
鹿島建設㈱大保 直人(OHHO Naoto)
構造研究室佐藤 昌志(SATOH Masashi)
抄録
A cable-stayed bridge in a state of cantilever under construction has quite different seismic characteris-tics from those of a completed system.This paper describes strong motions recorded at the Tokachi Ohashi Bridge(center span 251m)while under construction during earthquakes such as the Hokkaido Toho-oki Earthquake,which occurred off the east coast of Hokkaido on October 4 1994(M=8.1).Earthquake-induced behavior of the bridge is also reported.[*]Vibration modes derived from strong motion records and analytical modes were almost identical.In a mode associated with rocking of the foundation,the frequency was found to be extremely variable depending on the values of the spring constant of the ground;hence its evaluation is important.A response analysis of the construction system revealed that the damping ratio of the construction system was smaller than the damping ratio used for determining elasticity at concrete structures in design of the completed system.
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