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- 주제어 : Residual shear capacity (검색결과 2 건)
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Residual Shear Capacity of Reinforced Concrete Beams after Fire Exposure
Yamin Song,Chuanguo Fu,Shuting Liang,Dong Li,Longji Dang,Chongfang Sun,Weiyi Kong 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.11
The mechanical properties of concrete and steel are seriously degraded under high temperature, so that reinforced concrete (RC) members after fire may not be able to satisfy the prescribed performance. In this study, 27 full-scale RC beams were carried out shear tests to investigate the shear behaviour after fire. A total of 20 beams were subjected to fire on three sides in accordance with ISO 834 standard fire curve, and the remaining 7 beams (which were not subjected to fire) were employed as a reference. The influences of fire time, stirrup ratio, shear span ratio, longitudinal reinforcement ratio, and preloading (40% loading level) were considered. The experimental results indicated that the shear failure mode of the RC specimens after fire exposure was similar to that of the reference specimens. Both the residual shear load bearing capacity and stiffness of the RC beams decreased after being subjected to fire. The loss of shear bearing capacity increased with the heating time. In addition, the ultimate load bearing capacity of specimens with stirrups subjected to the same fire exposure time decreased with an increasing shear span ratio.
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전단 및 휨파괴형 부재가 혼합된 저층 철근콘크리트 건물의 간이 내진성능 평가법 제안
이강석(Lee Kang-Seok) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
The Current rapid-screening methods, such as the Screening Phase of FEMA 310 and the First Level Procedure in Japanese Standard, have been developed to evaluate seismic capacities of a large number of existing buildings immediately. In the current methods, however, the seismic capacities of RC (reinforced concrete) buildings controlled by both shear and flexure have not been fully discussed. These are mainly focused on the strength capacity to withstand earthquake motions without the demand for ductility. This study proposes a new rapid-screening method for more reasonably evaluating the seismic capacities of low-rise RC buildings controlled by both shear and flexure. The proposed method is based on relationships between required strengths of each failure system for ductility factors and damage degrees of overall system derived from the view point of ductility factors. By using the damage estimate method presented in this study, the building performance level associated with a specific level of earthquake demand of low-rise RC buildings that consist of lateral-load resisting members controlled by both shear and flexure can be evaluated. The seismic rehabilitation criteria in terms of expected building performance levels can also be established effectively. The proposed method is verified using observed real damage data of low-rise RC buildings caused by past earthquakes, and applied to existing RC buildings in Korea. Results indicate that the methodology proposed in this study compares well with real damages and is a useful strategy for rapidly identifying low-rise RC buildings having high potential seismic risk.
ScienceON
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