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Comparison of the Behaviour of Axially Loaded Slender Hollow Steel Tubes and Concrete Filled Steel Tubes
Concrete filled steel tubes (CFSTs) are composite members in which concrete is encased within hollow steel tubes (HSTs). To understand the influence of the concrete core on the elastic local buckling stress and the axial strength of the steel tube, finite-element (FE) models of HST and CFST are developed using ABAQUS. From the FE analysis of CFST, it is evident that even for a diameter to thickness ratio (D/t) of 150 which is much higher than the (D/t) limit for slender members (D/t = 110), local buckling is not observed up to the ultimate load. This explains the reason for the highly conservative prediction of slender CFSTs by AISC 360-16. In addition, the yielding of the steel tube occurs before the peak strength of CFST is achieved, and the reduction in the load carrying capacity beyond peak load is due to the crushing of the core concrete. It is also observed that the axial strength of steel in CFSTs can be much lower than that predicted in the literature and codal provisions due to development of hoop stresses.
Comparison of the Behaviour of Axially Loaded Slender Hollow Steel Tubes and Concrete Filled Steel Tubes
Concrete filled steel tubes (CFSTs) are composite members in which concrete is encased within hollow steel tubes (HSTs). To understand the influence of the concrete core on the elastic local buckling stress and the axial strength of the steel tube, finite-element (FE) models of HST and CFST are developed using ABAQUS. From the FE analysis of CFST, it is evident that even for a diameter to thickness ratio (D/t) of 150 which is much higher than the (D/t) limit for slender members (D/t = 110), local buckling is not observed up to the ultimate load. This explains the reason for the highly conservative prediction of slender CFSTs by AISC 360-16. In addition, the yielding of the steel tube occurs before the peak strength of CFST is achieved, and the reduction in the load carrying capacity beyond peak load is due to the crushing of the core concrete. It is also observed that the axial strength of steel in CFSTs can be much lower than that predicted in the literature and codal provisions due to development of hoop stresses.
Comparison of the Behaviour of Axially Loaded Slender Hollow Steel Tubes and Concrete Filled Steel Tubes
Lecture Notes in Civil Engineering
Madhavan, Mahendrakumar (editor) / Davidson, James S. (editor) / Shanmugam, N. Elumalai (editor) / Paul, Rebecca Mary (author) / Karthik, Madhu M. (author) / Kumar, M. V. Anil (author)
Indian Structural Steel Conference ; 2020 ; Hyderabad, India
Proceedings of the Indian Structural Steel Conference 2020 (Vol. 2) ; Chapter: 6 ; 67-79
2023-08-23
13 pages
Article/Chapter (Book)
Electronic Resource
English
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