High strength thin-walled rectangular concrete-filled steel tubular slender beam-columns,Part I: Modeling |
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| Affiliation: | 1. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;2. Institute for Infrastructure Engineering, University of Western Sydney, Penrith, NSW 2751, Australia;3. School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, NSW 2751, Australia;1. School of Civil Engineering, Hefei University of Technology, Anhui Province 230009, China;2. Anhui Civil Engineering Structures and Materials Laboratory, Anhui Province 230009, China;3. College of Civil Engineering, Fuzhou University, Fuzhou, Fujian Province 350108, China |
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| Abstract: | High strength thin-walled rectangular concrete-filled steel tubular (CFST) slender beam-columns under eccentric loading may undergo local and overall buckling. The modeling of the interaction between local and overall buckling is highly complicated. There is relatively little numerical study on the interaction buckling of high strength thin-walled rectangular CFST slender beam-columns. This paper presents a new numerical model for simulating the nonlinear inelastic behavior of uniaxially loaded high strength thin-walled rectangular CFST slender beam-columns with local buckling effects. The cross-section strengths of CFST beam-columns are modeled using the fiber element method. The progressive local and post-local buckling of thin steel tube walls under stress gradients is simulated by gradually redistributing normal stresses within the steel tube walls. New efficient Müller's method algorithms are developed to iterate the neutral axis depth in the cross-sectional analysis and to adjust the curvature at the columns ends in the axial load–moment interaction strength analysis of a slender beam-column to satisfy equilibrium conditions. Analysis procedures for determining the load–deflection and axial load–moment interaction curves for high strength thin-walled rectangular CFST slender beam-columns incorporating progressive local bucking and initial geometric imperfections are presented. The new numerical model developed is shown to be efficient for predicting axial load–deflection and axial load–moment interaction curves for high strength thin-walled rectangular CFST slender beam-columns. The verification of the numerical model and parametric studies is given in a companion paper. |
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