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Title |
Seismic Performance of Octagonal Flared RC Columns using Oblong Hoops
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.6.001 |
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Keywords |
플레어 기둥 ; 장방형 단면 ; 장방형 후프 띠철근 ; 횡구속 방법 ; 내진성능 Flared column ; Oblong cross-section ; Oblong hoop detail ; Lateral confinement method ; Seismic performance |
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Abstract |
Transverse steel bars are used in the plastic hinge zone of columns to insure adequate confinement, prevention of longitudinal bar buckling and ductile behavior. Fabrication and placement of rectangular hoops and cross-ties in columns are difficult to construct. Details of reinforcement for rectangular section require a lot of rectangular hoops and cross-ties. In this paper, to solve these problems, the new lateral confinement method using oblong hoop is proposed for the transverse confinement of the flared column. It can be the alternative for oblong cross-section and flared column with improved workability and cost-efficiency. The final objectives of this study are to suggest appropriate oblong hoop details and to provide quantitative reference data and tendency for seismic performance or damage assessment based on the drift levels such as residual deformation, elastic strain energy. This paper describes factors of seismic performance such as ultimate displacement/drift ratio, displacement ductility, response modification factor, equivalent viscous damping ratio and effective stiffness.
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