Numerical analysis and design of slender concrete-filled elliptical hollow section columns and beam-columns

Abstract

A numerical model simulating the behaviour of elliptical concrete-filled columns under either concentric or eccentric compressive load has been developed in ABAQUS. The numerical results have been compared against a range of experimental results for ultimate load, load-deflection behaviour and failure modes, with good agreement observed. An extensive parametric study has been undertaken whereby the slenderness, load eccentricity, cross-sectional geometry and reinforcement ratio of the concrete-filled columns were varied, creating a data set upon which to formulate design guidance since currently there are no specific provisions in the European Standard EN 1994-1-1 [1] for the design of concrete-filled steel elliptical section columns or beam-columns. It is shown Qiu, W., McCann, F., Espinos, A., Romero, M. L. and Gardner, L. (2017

Compressive Behaviour of Circular, Square, and Rectangular Concrete-Filled Steel Tube Stub Columns

“…Since concrete was greatly influenced by the confinement effect of the steel tube, its behaviour was different from other common models. The ratio of the second stress invariants on the tensile and compressive meridians (K c ) was selected as 0.667 [21,22]. The viscosity parameter utilised for better convergence was 0.0001.…”

“…The constraint called Embedded Region was utilised to model the contact surface between the concrete core and perimeter steel tube. The used friction coefficient (μ) for the contact was 0.3 [21,22]. The load was applied by the displacement method.…”

Numerical analysis and design of slender elliptical hollow sections in bending

“…A first-order reliability method (FORM) similar to that used for concrete-filled EHS columns [12], hot-rolled steel sections [38] and stainless steel sections [39][40][41] was employed in the present study; a detailed description of the theoretical background of the methodology can be found in [39,42]. The general form of the resistance function rt for slender EHS in either bending or compression is:…”

“…This can be attributed to their introduction and availability as hot-finished products [1], their aesthetic properties, which have led to their use in high-profile projects such as Heathrow Terminal 5, Barajas Airport, Madrid, the University of Warwick and Cork Airport [2], and their enhanced flexural properties about the major principal axis when compared to circular hollow section (CHS) tubes [3]. Research into the structural response of EHS tubes has included testing, numerical modelling and the development of design rules for cross-sections in compression and bending [4][5][6][7], analysis of the global buckling response of EHS columns [7,8], stainless steel EHS columns [9], EHS columns in fire [10], concrete-filled EHS columns [11][12][13][14], beams [15] and beam-columns [16], the behaviour of members in shear [17] and the postbuckling behaviour and strength of slender EHS tubes in compression [18].…”

Cold-formed elliptical concrete-filled steel tubular columns subjected to monotonic and cyclic axial compression

“…Due to the composite action between steel tube and concrete, concrete-filled steel tubular (CFST) columns have many advantages, such as high strength and high ductility. Over the past decades, there has been significant interest in research relating to different kinds of CFST, including CFST with different cross sections (Ding et al, 2016; Sakino et al, 2004), concrete-filled stainless steel tubes (CFSST; Lam et al, 2019; Uy et al, 2011), concrete-filled double skin steel tubes (CFDST; Liang, 2018; Tao and Han, 2006), recycled aggregate CFSST (Chen et al, 2017; Tang et al, 2018), with a timer call (Ghazijahani et al, 2017), and elliptical CFST (Qiu et al, 2017; Yang et al, 2008). All these studies explored different aspects of CFST.…”