Steel and Composite Structures

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Numerical study on axially loaded ultra-high strength concrete-filled dual steel columns

  • Pons, David (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia) ;
  • Espinos, Ana (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia) ;
  • Albero, Vicente (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia) ;
  • Romero, Manuel L. (Instituto de Ciencia y Tecnologia del Hormigon (ICITECH), Universitat Politecnica de Valencia)
  • Received : 2017.10.03
  • Accepted : 2018.01.12
  • Published : 2018.03.25
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Abstract

This paper presents a numerical investigation on the mechanical performance of concrete-filled dual steel tubular columns of circular section subjected to concentric axial load. A three-dimensional numerical model is developed and validated against a series of experimental tests. A good agreement is obtained between the experimental and numerical results, both in the peak load value and in the ascending and descending branches of the load-displacement curves. By means of the numerical model, a parametric study is carried out to investigate the influence of the main parameters that determine the axial capacity of double-tube columns, such as the member slenderness, inner and outer steel tube thicknesses and the concrete grade - of both the outer concrete ring and inner core -, including ultra-high strength concrete. A total number of 163 numerical simulations are carried out, by combining the different parameters. Specific indexes are defined (Strength Index, Concrete-Steel Contribution Ratio, Inner Concrete Contribution Ratio) to help rating the relative mechanical performance of dual steel tubular columns as compared to conventional concrete-filled steel tubular columns, and practical design recommendations are subsequently given.

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