| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 103 === This study presents nonlinear fiber element method determine the axial load-biaxial bending moment interaction curves of concrete filled steel tubular beam-columns (CFT). Second-order effect is considered by assuming the deflected shape of the CFT beam-columns. Determine the maximum moment at the column ends for different axial compression loads by fiber element analysis method, the interaction curves are constructed and second-order effect is considered. Analytical results are verified by comparing with the experimental results. For the cases that the fiber element analysis method, AISC-LRFD and ACI can accurately predict the flexural strength, the parameters of the cases are studied in this research. The predicted results of fiber element analysis method show good agreement with the uniaxial bending tests. The AISC-LRFD and ACI is suitable predict the flexural strength of short CFT beam-columns. To construct the general interaction equations, interaction curves of CFT beam-columns with different width-to-thickness ratio, material strength and column lengths are considered in the equations.
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