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화재손상된 철근콘크리트 깊은 보의 전단경간비에 따른 구조성능 변화
서수연(Seo Soo-Yeon),윤승조(Yoon Seung-Jo),김영만(Kim Yeong-Man),최기봉(Choi Ki-Bong) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.11
This paper presents experimental result of reinforced concrete deep beams with various shear span-to-depth ratios damaged by fire. Main parameters in the test were fire exposure duration and shear span-to-depth ratio. Nine RC deep beam specimens were made and six of those were exposed to fire by following standard fire loading curve. And then beam test was performed for those under simple support condition. Strength variation of materials by the exposure time and temperature of fire was evaluated through material test for concrete and reinforcements damaged by fire. In order to predict the specimen's structural capacity, analysis was performed using nonlinear sectional analysis and truss analogy. From the research, it was found that the strength of RC deep beam damaged by fire was more seriously affected by level of temperature than exposure time during fire loading. However, concrete tended to be dry as the exposure time increased so that the overall behavior of member changed to brittle failure mode. In order to suitably predict the strength of deep beam damaged by fire, the change of properties of concrete and reinforcements at each location should be well defined and appropriately reflected in analysis model.
서수연(Seo Soo-Yeon),윤승조(Yoon Seung-Joe) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
In this paper, the displacement capacity of shear wall designed by strength-based design method is evaluated at the life-safety level. A procedure to evaluate the displacement capacity of coupled shear wall is introduced through an evolution on the Sasani's study(1998). Six shear wall buildings (5, 10, and 15 story), three buildings with isolated shear walls and three buildings with coupled shear walls, are designed according to the strength-based design method(UBC 97). Using the proposed procedure, the displacement demand and capacity of these buildings are evaluated For all cases, shear walls showed displacement capacities higher than demands as well as not exceeding the maximum drift limit, 0.02 (Vision 2000, 1995). In 5 story buildings, especially, this phenomenon was definitely clear. This means that the shear wall building can be designed to have too high displacement capacity when it is designed by the strength-based design method. On comparing with buildings with isolated shear walls and coupled shear walls, the former showed lower displacement demand and capacity than the latter. This change of displacement demand and capacity due to the coupling wall was maximized in 15 story buildings. From this, it is concluded that while the coupling walls can increase the strength and stiffness of building and reduce displacement demand, it also decreases the displacement capacity.