Compressive Behaviour of Discontinuous Double Steel Tube Confined Concrete Column
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Department of Civil and Environmental Engineering(CEE), Islamic University of Technology (IUT), Board bazar, Gazipur-1704. bangladesh
Abstract
In this study, a new type of concrete filled tube (CFT) column knowns as discontinuous
double steel tube confined concrete (DDSTCC) columns were investigated for
compressive behaviour through numerical simulations and analytical modelling.
Unlike conventional concrete filled steel tube (CFST) and concrete filled double steel
tube (CFDST) columns, the DDSTCC column consists of inner continuous steel tube
and outer discontinuous steel tube with infilled inner and sandwich concrete. The
discontinuous outer steel tube enhances the confinement, higher than the continuous
tube, thereby improving load bearing capacity and buckling behaviour. The numerical
simulation was carried out using ABAQUS, incorporating both material and geometric
nonlinearities. First, the accuracy of the finite element (FE) models was validated
against experimental data in terms of load-displacement, peak loads, and failure
behaviour. Then, a three-stage parametric study was conducted considering key
parameters such as thickness of steel tubes, diameter of inner tube, height, strength of
materials and loading eccentricity. Regarding stub and full-scale slender column, using
high strength outer steel and sandwich concrete could significantly improves axial
strength 20% to 24% while increasing the diameter of inner tube improves post peak
stability. However, for eccentrically loaded column the moment capacity and buckling
resistance was influence by thickness and diameter of inner steel tube. In terms of
failure pattern, slender DDSTCC columns exhibited C-shaped buckling, with failure
primarily influenced by global instability while eccentrically loaded column shows
localized failure. The existing design standards EC4, GB 50936–2014, and DBJ/T 13
51-2010 applicable for CFST column fails to fully capture the unique confinement
effects of DDSTCC columns. Thus, a modified analytical formula was developed,
xiv
achieving mean test-to-predicted strength ratios of 1.02 (stub) and 0.95 (full-scale)
with a partial safety factor of 0.98. A comparative analysis shows that the proposed
formula demonstrates a better predictive accuracy and material efficiency than other
design standards. Thus, the DDSTCC columns could be a viable option for high-rise
and large-span structures due to its superior confinement, enhanced compressive
behaviour with stable buckling failure pattern. The findings of this study provide
valuable design guideline which could shed light into the applicability of this column
and guide the day-to-day design practitioners for high rise construction.
Description
Supervised by
Dr. Md. Imran Kabir,
Assistant Professor,
Department of Civil and Environmental Engineering (CEE),
Islamic University of Technology (IUT),
This thesis was submitted for partial fulfilment of the requirement for the degree of Master of Science in Civil
Engineering.
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Citation
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