Techno Press

Steel and Composite Structures   Volume 26, Number 6, March25 2018, pages 705-717
Numerical study on axially loaded ultra-high strength concrete-filled dual steel columns
David Pons, Ana Espinós, Vicente Albero and Manuel L. Romero

Abstract     [Full Text]
    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.
Key Words
    finite element model; concrete-filled dual steel tubular columns; ultra-high strength concrete; slender columns
Instituto de Ciencia y Tecnologĺa del Hormigon (ICITECH), Universitat Politècnica de València, Valencia, Spain.

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