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INNOVATION IN CIVIL AND STRUCTURAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
A Review of Nonlinear Analysis Models for Concrete Filled Tubular Columns
M.L. Romero*, J.L. Bonet+ and S. Ivorra#
*Department of Technology, University Jaume I de Castellón, Spain
M.L. Romero, J.L. Bonet, S. Ivorra, "A Review of Nonlinear Analysis Models for Concrete Filled Tubular Columns", in B.H.V. Topping, (Editor), "Innovation in Civil and Structural Engineering Computing", Saxe-Coburg Publications, Stirlingshire, UK, Chapter 6, pp 119-142, 2005. doi:10.4203/csets.13.6
Keywords: state-of-the-art, concrete filled tubular (CFT), high strength concrete, non-linear finite element analysis, numerical models.
This paper presents a state-of-art review of the numerical models for concrete filled tubular (CFT) columns paying special attention to the field of high strength concrete. The numerical behaviour of such columns is discussed with respect to the composite behaviour, geometry of the sections, type of loads, load application system, confinement effects, bond-slip, local buckling, second order effects and residual stresses. The paper reviews the research undertaken in the last ten years, and addresses future work in this interesting field.
The authors have found more than two hundred papers related to CFTs., but in the last decade, some papers have been published reviewing the state of the art of composite or concrete filled tubular columns.
Shams and Saadeghvaziri  presented the state of the art for concrete-filled steel tubular (CFT) columns including experimental and analytical work. They discussed the general response of CFT columns and the use of steel jacketing. They also presented an overview of analytical work for CFTs, including a comparison between the different design codes.
Hajjar  presented a review of the behaviour of circular and rectangular concrete-filled steel tube beam-columns and braces, and particularly focused on their behaviour when subjected to cyclic seismic loading. He explained the monotonic behavior of CFTs subjected to axial, flexural, and torsional loading, summarizing the effects of CFT behaviour including creep, shrinkage, composite action and residual stresses.
Gourley et al.  summarised the experimental tests on CFTs in a very important research report.
Spacone and El-Tawil  presented a state of the art of nonlinear analysis of steel-concrete composite structures. The work was focussed on frame elements, section models and fibber models, with lumped and distributed inelasticity, as well as models with perfect and partial connections.
In this paper, research done by the authors is summarized, extended and focussed on the field of high strength concrete. However, due to space limitations the numerical models for fire, connections, and seismic loading are not presented here because they require a special review for each of them.
The conclusions of the paper are that:
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