Abstract
Concrete‐filled steel tube (CFST) sections are structural members that effectively use the best properties of steel and concrete. Steel tube at the outer perimeter effectively resists tension and bending moments and also increases the stiffness of the section as steel has a high modulus of elasticity. The infilled concrete delays the local buckling of the thin outer steel tube. The interface bond strength plays a major role in the composite action of CFST sections. Provision of rectangular flutes on steel tube on CFST sections will improve the bond failure load and thereby the performance of CFST sections significantly. In this paper, the bond strength and displacement characteristics of steel‐concrete composite sections are determined by incorporating rectangular shaped flutes into the steel tube. A total of five sections were tested to assess the influence of flutes on the bond strength. These tested sections are analyzed and are used to develop a finite element model using the finite element software ABAQUS version 6.13. The parameters chosen for the FE study are (i) type of flutes (outward and inward), (ii) D/t ratio (40, 60, and 80), (iii) number of flutes (2, 3, 4, 5, and 6), and (iv) dimension of flutes ((20 mm × 10 mm), (40 mm × 10 mm), and (60 mm × 10 mm)). Bond failure load is found to be higher for outward fluted sections compared to inward fluted and plain CFST sections.
Highlights
Steel-concrete composite sections are widely used in structural engineering applications due to their excellent composite action under static and dynamic loading conditions. e steel tube effectively resists the bending moment and tension
Concrete core in Concrete-filled steel tube (CFST) sections delays the local buckling of steel tube, whereas steel tube at the outer perimeter confines the concrete infill thereby enhancing the strength and durability
Steel tubes are incorporated with rectangular flutes to enhance the aesthetics and development area by which the moment of inertia of composite member increases
Summary
Steel-concrete composite sections are widely used in structural engineering applications due to their excellent composite action under static and dynamic loading conditions. e steel tube effectively resists the bending moment and tension. Ere is no experimental or analytical work carried out on concrete-filled steel fluted sections to determine the interface bond strength. Limited work has been carried out to determine the load-carrying capacity of concretefilled steel fluted sections In this present work, an attempt has been made to study the influence of D/t ratio, dimension of flute, interface length, and number of flutes on the bond strength, to compare the effectiveness of inward and outward flutes, and to develop a validated FE model to accurately predict the bond behavior of steel-concrete composite fluted sections. Flutes have been provided in the outer steel shell to increase the moment of inertia of the composite section and thereby increase the bond strength, ultimate load-carrying capacity, ductility, and initial stiffness of CFST sections.
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