Abstract
Spiral welded stainless tubes are produced by helical welding of a continuous strip of stainless steel. Recently, concrete-filled spiral welded stainless steel tubes have found increasing application in the construction industry due to their ease of fabrication and aesthetic appeal. However, an in-depth understanding of the behaviour of this type of structure is still needed due to the lack of proper design guidance and insufficient experimental verification. In this paper, the mechanical performance of concrete-filled spiral welded stainless steel tubes will be numerically investigated with a commercial finite element software package, through which an experimental program can be designed properly. Specifically, the proposed finite element models take into account the effects of material and geometric nonlinearities. Moreover, the initial imperfections of stainless steel tubes and the form of helical welding will be appropriately included. Enhancement of the understanding of the analysis results can be achieved by extending results through a series of parametric studies based on the developed finite element model. Thus, the effects of various design parameters will be further evaluated by using the developed finite element model. Furthermore, for the purposes of wide application of such types of structure, the accuracy of the behaviour prediction in terms of ultimate strength based on current design codes will be studied. The authors herein compared the load capacity between the finite element analysis results and the existing codes of practice.
Highlights
In the current construction industry, welded steel tubes can be classified as longitudinal welded steel tubes and spiral welded tubes
The proposed finite element model provides an efficient method for structural analysis in order to develop design guidance for this application of composite structures
A parametric study of different variables was performed to investigate the effects of pertinent parameters on the structural behaviour of the concrete-filled spiral welded stainless steel tubes
Summary
In the current construction industry, welded steel tubes can be classified as longitudinal welded steel tubes and spiral welded tubes. Uy [5, 6], Han [7], Giakoumelis and Lam [8] and Liew and Xiong [9] reported extensive experimental programmes on short and slender CFST columns under axial compression. These CFST columns consist of normal and high-strength materials for both steel tube and infilled concrete. A non-linear finite element model based on Abaqus, which incorporates initial imperfections and residual stress, was developed to predict the axial load behaviour of hollow and concrete-filled spiral welded stainless steel tubes. With the developed finite element model, initial stiffness, axial compressive capacity and ductility of the concrete-filled stainless steel tubes under axial compression was evaluated
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