1. Investigations on axial compressive strength of circular CFDST short columns.
- Author
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Sankar, Aarathi and Nambiappan, Umamaheswari
- Subjects
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COLUMNS , *COMPOSITE columns , *STEEL tubes , *COMPRESSIVE strength , *FINITE element method , *STRENGTH of materials , *CONCRETE-filled tubes - Abstract
Double-skin steel tubes filled with concrete in between are considered as the extension of Concrete-filled steel tubes. These columns possess better structural properties such as high strength and stiffness, high resistance to fire and better cyclic performance compared to conventional columns. From the available literature, it can be identified that the parameters influencing the behaviour of Concrete-Filled Double-skin Steel Tubular (CFDST) columns are length to diameter (L/D) ratio, diameter to thickness (D/T) ratio/thickness of outer and inner steel tubes, concrete and steel strengths. This paper deals with the analysis of results obtained from finite element analysis study carried over by the authors, on axial compressive strength of circular CFDST short columns. The performance of Finite element (FE) models (created using commercially available software) of short CFDST columns under axial compression is analyzed. Initially the FE models are validated by making comparisons of the results obtained with those from experiments conducted by previous researchers, as available in literature. The influence of dimensions and material strength of CFDST short columns on their axial compressive strength is analysed. Furthermore the evaluation of axial compressive strength of CFDST short columns is performed using current international standards such as Eurocode 4 and AISC. The results show that D/T ratio of steel tubes and compressive strength of concrete used for filling has significant influence on axial compressive strength and failure pattern of CFDST columns. The predictions using current international standards are conservative and hence the equations need to be revised. The predictions based on equations proposed by previous researchers are also included, for comparison purpose. Based on the results a modified equation for predicting axial compressive strength of CFDST short columns is proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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