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Title |
Stress-strain Model of Laterally Confined High-strength Concrete with the Compressive Fracture Energy
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Authors |
홍기남(Ki-Nam Hong) ; 심원보(Won-Bo Shim) |
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DOI |
https://doi.org/10.11112/jksmi.2019.23.1.54 |
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Keywords |
구속콘크리트 ; 횡구속압 ; 국소파괴영역길이 ; 압축파괴에너지 ; 응력-변형률 모델 Confined concrete ; Laterally confined pressure ; Local fracture zone length ; Compressive fracture energy ; Stress-strain model |
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Abstract |
In this paper, a stress-strain model for high-strength confined concrete is proposed using compressive fracture energy. In the compression test performed by author in Reference [6], an acrylic bar with strain gauges was embedded in the center of the specimen to measure the local strain distribution. It was found from the test that the local strain measurement by this acrylic rod is very effective. The local fracture zone length was defined based on the local strain distribution measured by the acrylic rod. Specifically, it was defined as the length where the local strain increases more than twice of the strain corresponding to maximum stress. In addition, the stress-strain relationship of confined concrete with compressive fracture energy is proposed on the assumption that the amount of energy absorbed by the compressive members subjected to the given lateral confining pressure is constant regardless of the aspect ratio and size. The proposed model predicts even results from other researchers accurately.
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