Numerical simulation of concrete encased steel composite columns

Ellobody, Ehab; Young, Ben

doi:10.1016/j.jcsr.2010.08.003

Cited by 139 publications

(52 citation statements)

References 20 publications

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“…Composite columns can be steel-reinforced concrete (SRC) or concrete-filled steel sections. In addition to the aforementioned advantages, SRC columns have higher fire resistance and durability, when compared with concrete-filled steel columns (Chen and Lin, 2006;Ellobody and Young, 2011;Naito et al, 2011). Pseudo-static test studies have proved that the bearing capacity and displacement ductility of steel-reinforced high-strength concrete (SRHC) columns are higher than those of reinforced concrete columns (Jia et al, 2006;Zheng et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Experimental studies on axial load performance of high-strength concrete short columns

Zhu

Meng

Jia

2014

Proceedings of the Institution of Civil Engineers - Structures

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This paper presents the results of an experimental investigation into the axial load performance of steel-reinforced high-strength concrete short columns. The performance of a total of ten specimens is investigated, including the failure pattern, load-strain response, compressive strength and ductility. The parameters considered in this study are stirrup and structural steel arrangements. The definition of effective strength is developed to measure the compressive strength of columns due to the sudden drop of strength at peak. The ductility of columns is characterised by the ratio of after-peak and before-peak area under the curve of the axial load plotted against axial strain. Based on the experimental research, it is found that stirrups affect ductility and residual strength of columns, but not the peak strength. Structural steel influences the peak and residual strength and ductility of columns. Ductility of columns is approximately proportional to the effective confinement index if stirrups yield after peak. The effect of structural steel on ductility is more obvious when the effective confinement index is larger.

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Section: Introductionmentioning

confidence: 99%

Experimental studies on axial load performance of high-strength concrete short columns

Zhu

Meng

Jia

2014

Proceedings of the Institution of Civil Engineers - Structures

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“…2, C3D8R element is selected for meshing steel and concrete component while the reinforcement cage is meshed using T3D2 element. The interfacial bond behavior between encased steel section and concrete is simulated by defining a surface-tosurface contact algorithm with the surrounding concrete functioning as master surface while the encased steel working as slave surface, and the tangential behavior is modelled using penalty formulation with friction coefficient valued 0.25 as adopted by Ellobody et al [12]. Both top and bottom of column are tied to an endplate, which guarantees the uniform force transfer to the entire cross-section.…”

Section: Numerical Modelmentioning

confidence: 99%

Finite element analysis of concrete-encased steel composite columns with off-center steel section

Lai

Liew

2018

Proceedings 12th International Conference on Advances in Steel-Concrete Composite Structures - ASCCS 2018

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Concrete encased steel composite columns have been widely used in high-rise buildings and top-down constructions owning to excellent load-carrying capacity and fire resistance. However, double symmetric composite section is rarely achieved due to the off-center eccentricity of steel kingpost, which is a common problem in top-down constructions. EN1994-1-1 (EC4) simplified method does not provide any explicit provisions for this kind of irregular composite columns, and many designers address this issue by reducing it into a symmetrical cross-section for ease of simple calculation. This paper presents a general method based on nonlinear finite element modelling software ABAQUS to analyze the ultimate strength behavior of concrete-encased composite columns with asymmetrically placed steel section. The accuracy of the FE model is verified against existing test results. Parametric study is performed to further investigate the influence of steel section eccentricity on ultimate strength of stub columns under different loading conditions. A simplified method based on modification of EC4 design approach is developed to construct the moment-axial force interaction diagram. Accuracy of the proposed method is assessed by comparing the analytically predicted results with the numerical results. It is found that the proposed method can be adopted as a useful tool to predict the cross-section resistance of non-symmetrical concrete-encased steel composite columns.

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“…The relative slip between the two components was defined by the 'penaltyfriction' formulation [23]. The friction coefficient between steel profiles and concrete is typically in the range μf = 0.2-0.8, which varies with the loading mechanism and test setup [38][39][40]. A value of μf = 0.57 [40] was used as the reference value in all simulations and showed good correlation with the test results.…”

Section: Modelling Assumptionsmentioning

confidence: 99%