Abstract
This paper is concerned with the behaviour of concrete-filled tubular flange girders (CFTFGs) under the combination of bending and tensile axial force. CFTFG is a relatively new structural solution comprising a steel beam in which the compression flange plate is replaced with a concrete-filled hollow section to create an efficient and effective load-carrying solution. These members have very high torsional stiffness and lateral torsional buckling strength in comparison with conventional steel I-girders of similar depth, width and steel weight and are there-fore capable of carrying very heavy loads over long spans. Current design codes do not explicitly include guidance for the design of these members, which are asymmetric in nature under the combined effects of tension and bending. The current paper presents a numerical study into the behaviour of CFTFGs under the combined effects of positive bending and axial tension. The study includes different loading combinations and the associated failure modes are identified and discussed. To facilitate this study, a finite element (FE) model is developed using the ABAQUS software which is capable of capturing both the geometric and material nonlinearities of the behaviour. Based on the results of finite element analysis, the moment–axial force interaction relationship is presented and a simplified equation is proposed for the design of CFTFGs under combined bending and tensile axial force.
Highlights
Steel-concrete composite construction can provide an efficient structural solution by utilising the two component materials to create a single efficient composite section
A relatively new solution for these scenarios is a concretefilled tubular flange girder (CFTFG) which are formed by replacing the top flange plate of a typical I-shaped steel beam with a tubular section which can be filled with concrete
This paper presents the results of an extensive numerical investigation that is carried out to study the effects of axial tension applied in combination with sagging moment’s for CFTFGs
Summary
Steel-concrete composite construction can provide an efficient structural solution by utilising the two component materials to create a single efficient composite section. This is a scenario which occurs frequently in practice such as in continuous or semi-continuous members or, in extreme cases, if a support is removed and the beams are required to withstand high tensile loads to avoid progressive collapse In this context, the current paper presents a numerical study into the behaviour of CFTFGs under the combined effects of positive bending and axial tension. A finite element (FE) model was developed using the commercial software package ABAQUS (2011), which is capable of achieving numerical convergence for complex structural systems such as CFTFGs despite the geometric and material nonlinearities of the behaviour This model is a further advancement of the previous version which was employed to assess CFTFGs under bending (Al-Dujele and Cashell, 2018) and validated against available test data (Wang et al, 2008; Al-Dujele et al, 2018a).
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