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Title |
Nonlinear Analysis of FRP Strengthened Reinforced Concrete Columns by Force-Based Finite Element Model
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DOI |
https://doi.org/10.4334/JKCI.2013.25.5.529 |
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Keywords |
하중기반 유한요소 ; FRP 보강쉬트 ; 철근콘크리트 기둥 ; 비선형해석 force-based finite element ; FRP strengthening sheet ; reinforced concrete column ; nonlinear analysis |
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Abstract |
The aim of the current study is to develop a nonlinear isoparametric layered frame finite element (FE) analysis of FRP strengthened reinforced concrete (RC) beam or column members by a force-based FE formulation. In sections, concrete is modeled in the triaxial stress-strain relationship state and the FRP sheet is modeled as layered composite materials in two-dimension. The element stiffness matrix derived by the force-based FE has the force-interpolation functions without assuming the displacement shape functions. A lateral load test of RC column strengthened by GFRP sheets was analyzed by the developed force-based FE model. From comparative studies of the experimental and analysis results, it was shown to compare with the stiffness FE method that the force-based FE analysis could give more accurate predictions in the overall lateral load-deflection response as well as in nonlinear deformations and damages in the column plastic hinge region.
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