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Title |
Confinement Effect of High-Strength Steel Spirals According to Compressive Strength of Concrete
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Authors |
김상우 ; 김영식 ; 윤군진 ; 이정윤 ; 김길희 |
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Keywords |
횡구속 ; 구속 콘크리트 ; 고강도 철근 ; 나선철근 Confinement ; Confined concrete ; High-strength reinforcement ; Steel spiral |
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Abstract |
This study estimates the performance of steel spirals according to the compressive strength of the concrete. A total of 24 confined concrete cylinders (150×300mm) were cast and tested under monotonic concentric compression. The main test parameters were the yield strength of spiral reinforcements and the compressive strength of the concrete. To effectively evaluate the confinement effect according to the yield strength of steel spirals, the external diameter of steel spirals was designed to be same as the diameter of specimen. The experimental results indicated that the performance of confinement of steel spirals increased as the yield strength of spiral reinforcement increased and the compressive strength of the concrete decreased. Furthermore, existing analytical models were used for predicting the stress versus axial strain relationships of specimens tested in this study. It can be concluded that the accuracy of the analytical models deteriorated as the yield strength of steel spirals and the compressive strength of the concrete increased.
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