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Structural Engineering and Mechanics Volume 35, Number 2, May30 2010 , pages 241-256 DOI: https://doi.org/10.12989/sem.2010.35.2.241 |
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Numerical analyses of the force transfer in concrete-filled steel tube columns |
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Uwe Starossek, Nabil Falah and Thomas Lohning
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| Abstract | ||
| The interaction between steel tube and concrete core is the key issue for understanding the behavior of concrete-filled steel tube columns (CFTs). This study investigates the force transfer by natural bond or by mechanical shear connectors and the interaction between the steel tube and the concrete core under three types of loading. Two and three-dimensional nonlinear finite element models are developed to study the force transfer between steel tube and concrete core. The nonlinear finite element program ABAQUS is used. Material and geometric nonlinearities of concrete and steel are considered in the analysis. The damage plasticity model provided by ABAQUS is used to simulate the concrete material behavior. Comparisons between the finite element analyses and own experimental results are made to verify the finite element models. A good agreement is observed between the numerical and experimental results. Parametric studies using the numerical models are performed to investigate the effects of diameterto-thickness ratio, uniaxial compressive strength of concrete, length of shear connectors, and the tensile strength of shear connectors. | ||
| Key Words | ||
| composite columns; concrete-filled steel tube; bond stress; load transfer; mechanical shear connectors; confinement; test; finite element analysis; parametric study. | ||
| Address | ||
| Uwe Starossek: Structural Analysis and Steel Structures Institute, Hamburg University of Technology (TUHH), Denickestrasse 17, D-21073 Hamburg, Germany Nabil Falah: Structural Analysis and Steel Structures Institute, Hamburg University of Technology (TUHH), Denickestrasse 17, D-21073 Hamburg, Germany Thomas Lohning: Structural Analysis and Steel Structures Institute, Hamburg University of Technology (TUHH), Denickestrasse 17, D-21073 Hamburg, Germany | ||