PERFORMANCE CHECK FOR STEEL SUPERSTRUCTURE IN THE SEISMIC DESIGN OF YOKOHAMA BAY BRIDGE

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  • 横浜ベイブリッジの耐震補強設計における鋼上部構造を対象とした性能照査

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  Seismic retrofitting is under way for the Yokohama Bay Bridge, Rainbow Bridge and Tsurumi Tsubasa Bridge, long-span cable-supported bridges on the metropolitan expressway. This paper presents the results of seismic performance check for the steel truss girder in the lower deck of a double-deck main girder and for the steel pylon of the Yokohama Bay Bridge, a long cable-stayed bridge. The steel through truss girder and steel pylon were modeled using three-dimensional shell elements because no empirical research results were available concerning their strength and nonlinearity. A pushover analysis was then conducted using as a seismic force the inertia force distribution at the maximum seismic response at the study damage position, for checking seismic performance of the superstructure.

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