단일교각 병렬교에 작용하는 풍하중
Wind Load on Bridge with Split Decks on Single Pier
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초록
본 논문에서는 단일교각 위의 병렬교량에 작용하는 풍하중의 계측과 전산해석에 관한 내용을 다루었다. 병렬교량은 풍하측 주형이 풍상측 주형의 후류에 위치함에 따라 일반적으로 낮은 풍하중이 작용하는데 현행 한국 도로교 규정에 따르면 분리된 교각을 가정하고 각 주형에 작용하는 풍하중에 주형간의 거리에 따른 0.3에서 1.3 사이의 보정계수만을 고려함으로써 과도한 풍하중이 산정될 우려가 있다. 이에 본 논문에서는 풍동실험을 통해 공기력 계수, 특히 풍방향의 주형별 저항을 계측하고 같은 경우에 대해 전산유체역학을 이용해 해석하여 비교함과 동시에 한국 기준의 과도한 산정 기준을 지적하였다. 또한 실험으로 재현하기 어려운 난류 조건 변화에 따른 공기력 계수 변화를 전산 해석을 통하여 분석하였다
Abstract
This paper presents a study of wind load on bridges with split decks on single pier. The bridge decks of interest are split in the along wind direction; one of the split decks is facing upcoming wind while the other, referred as downwind deck, is influenced by the wake of the so-called upwind deck. Current practice in the standard for the wind load on such structures assumes that each of split decks is supported by separate piers, and provides correction factors for the wind load coefficients for a single deck. Wind load for a single girder can be estimated by the Korean standard, which is applied to split decks with correction factors ranging from 0.3 to 1.3 depending on the distance between two decks. However, this is considered inappropriate when the split decks are commonly supported by a single pier. In order to obtain appropriate wind load on bridge with split decks on a single pier, experimental investigations were carried out and the results were compared with those of computational study. The results show that downwind deck experiences relatively small wind load, affected by the wake of upwind deck; the total wind load exerted on the single pier can be highly over-estimated by the current standard
참고문헌 (5)
- "Korean Highway Design Specif" (2003)
- "The Flutter Coefficients Identification of Bridge Girders", 2.(2), pp.224~232 (1998)
- "Experimental Study on the Aerodynamic Responses of Double-Deck Suspension Bridge and Railway Vehicles in the Bridge", 6.(2), pp.129~136 (2002)
- "Effects of Structural Damping on the Vortex-Induced Response of Basic Bridge Sections in Turbulent Flows", 8.(2), pp.177~185 (2004)
- "FLUENT Users' Guide" (2004)