Flexural Behavior of High-Strength Concrete Beams Confined with Stirrups in Pure Bending Zone
- Authors
- 장일영; 박훈규; 김용곤; 김성수; 김종회
- Issue Date
- 2009
- Publisher
- 한국콘크리트학회
- Keywords
- high strength; ductility; stirrup; pure span
- Citation
- International Journal of Concrete Structures and Materials, v.3, no.1, pp.39 - 45
- Journal Title
- International Journal of Concrete Structures and Materials
- Volume
- 3
- Number
- 1
- Start Page
- 39
- End Page
- 45
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/2869
- ISSN
- 1976-0485
- Abstract
- The purpose of this study is to establish flexural behavior of high-strength concrete beams confined in the pure bending zone with stirrups. The experiment was carried out on full-scale high-strength reinforced concrete beams, of which the compressive strengths were 40 MPa and 70 MPa. The beams were confined with rectangular closed stirrups. Test results are reviewed in terms of flexural capacity and ductility. The effect of web reinforcement ratio, longitudinal reinforcement ratio and shear span to beam depth ratio on ductility are investigated. The analytic method is based on finite element method using fiber-section model, which is known to define the behavior of reinforced concrete structures well up to the ultimate state and is proven to be valid by the verification with the experimental results above. It is found that confinement of concrete compressive regions with closed stirrups does not affect the flexural strength but results in a significantly increased ductility. Moreover, the ductility tends to increase as the quantity of stirrups increases by reducing the spacing of stirrups.
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