ANALYTICAL STUDY ON DYNAMIC BEHAVIOR OF A DAMAGED TWO-SPAN CONTINUOUS STEEL CABLE-STAYED BRIDGE

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  • 被災した2径間鋼斜張橋の振動特性に関する解析的検討

Abstract

<p> A steel cable-stayed bridge, Kuwazuru Ohashi, located in a mountainous area was damaged during the 2016 Kumamoto earthquake. The bridge is characterized by having curved girders and unequal spans, and the damage was caused by these structural characteristics. In this study, in order to clarify the cause of the damage to Kuwazuru Ohashi, self-weight analyses and non-linear dynamic analyses were conducted with a straight girder model and an equal span model in addition to an unequal span curved girder model which is the damaged bridge. A series of analyses confirmed that the curved bridge girder was subjected to a force acting towards the outside of the curvature of the girder. Also, an equal span girder has the uplift force in the bearings under self-weight, and this uplift was magnified by the earthquake force. Unequal span girders tend to rotate under earthquake, and curved girders also exhibited a rotational behavior.</p>

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