MINIMUM CROSS-SECTIONAL SHAPE OF GIRDER FOR LONG-SPAN CABLE-STAYED BRIDGES BASED ON STATIC AND DYNAMIC INSTABILITY ANALYSES

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  • 長大斜張橋の静的, 動的安定解析に基づく最小主桁断面形状設定に関する考察
  • チョウダイ シャチョウキョウ ノ セイテキ ドウテキ アンテイ カイセキ ニ モトヅク サイショウ シュゲタ ダンメン ケイジョウ セッテイ ニ カンスル コウサツ

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Abstract

This paper presents instability analyses, such as elasto-plastic finite displacement analysis under in-plane load, finite displacement analysis under displacement-dependent wind load and flutter analysis based on modal coordinate, which identify static and dynamic instabilities of long-span cable-stayed bridges. Using 1400-meter cable-stayed bridge models with four types of cross sectional shapes of the girder, whose span-to-width and span-to-depth ratios are considerably large compared with those used in past long-span conventional cable-stayed bridges, instability analyses are carried out. From these calculations, a minimum cross sectional shape ensuring safety against static and dynamic instabilities was presented. It was found that instability under static wind load is the most critical, but that the span-to-girder width ratio can be greater than the widely-believed value of 40.

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