| dc.description.abstract | Concrete-filled steel tubes (CFST) have the advantages of high ductility, high fire resistance
compared to steel structures. CFST columns are able to withstand high axial loads and have
begun to be widely used for super-tall buildings in China. Finite element analysis using the MSC
Marc/Mentat software was performed instead of experimentation. The concrete elements are
using 3D solid elements. The stress-strain curve in the compression region is multilinear after
'
0,3 c
f . Softening occurs after reaching the value of '
c
f and returns to the value of
0
'
0,3 c
f after
5 strain. For the tensile area, it is modeled as bilinear, that is, after reaching the tensile stress
value, the stress remains constant. The Mohr-Coulomb yield criterion is used for concrete with
kinematic hardening rules on plasticity. For steel tubes, a bilinear model with strain hardening
and Von Mises yield criteria with isotropic hardening rule on plasticity are used. The both ends
support and the loading are clamped. Contact analysis was carried out between the steel tube
and the concrete. To model the end clamped plates, the rbe2 element is used. The results of the
analysis show the load-deflection curve that is almost the same between the experiment and the
finite element. The load-strain curve also shows a similar phenomenon. The compressive axial
load calculated using AIJ produces a smaller value than the experimental and finite element
results. The final deflected column occurs local buckling in the middle of the span. | en_US |
