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Structural Engineering and Mechanics Volume 13, Number 3, March 2002 , pages 313-328 DOI: https://doi.org/10.12989/sem.2002.13.3.313 |
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A study on compressive strength of concrete in flexural regions of reinforced concrete beams using finite element analysis |
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Chang-Geun Cho (Korea) and Hisato Hotta (Japan)
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| Abstract | ||
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Based on the orthotropic hypoelasticity formulation, a triaxial constitutive model of concrete is proposed. To account for increasing ductility in high confinement of concrete, the ductility enhancement is considered using so called the strain enhancement factor. It is also developed a three-dimensional finite element model for reinforced concrete structural members based on the proposed constitutive law of concrete with the smeared crack approach. The concrete confinement effects due to the beam-column joint are investigated through numerical examples for simple beam and structural beam member. Concrete at compression fibers in the vicinity of beam-column joint behaves dominant not only by the uniaxial compressive state but also by the biaxial and triaxial compressive states. For the reason of the severe confinement of concrete in the beam-column joint, the flexural critical cross-section is observed at a small distance away from the beam-column joint. These observations should be utilized for the economic design when the concrete structural members are subjected to high confinement due to the influence of beam-column joint. | ||
| Key Words | ||
| compressive strength of concrete; hypoelastic model; finite element analysis; concrete confinement due to beam-column joint. | ||
| Address | ||
| Chang-Geun Cho, Research Institute for Disaster Prevention, Kyungpook National University, Sankyuk-Dong 1370, Puk-Ku, Taegu, Korea Hisato Hotta, Department of Architecture and Building Engineering, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-Ku, Tokyo, Japan | ||