Abstract
This paper presents a nonlinear finite element model to investigate the behaviour of cold- formed steel tubes filled with concrete made with crystallized slag aggregate. The columns had different lengths so that the length-to-depth ratio varied from 0.49 to 24. Nonlinear models for confined concrete and steel welded tubes with taking into account the effect of residual stress of steel section were used in the finite element model. The study was conducted over a wide range of concrete cylinder strengths from 20 to 45 MPa. The depth of flat portion-to-plate thickness (d/t) ratio hollow sections steel ranged from 24 to 52, covering compact and slender sections. The main studied parameters were: the section dimension and the effect of the in filled concrete and its age. The results obtained from the finite element analysis were verified against experimental results. An extensive parametric study was conducted to investigate the effects of cross-section geometry and concrete strength on the behaviour and strength of the columns. The column strengths obtained from the finite element analysis were compared with the design strengths calculated using the Eurocode 4.
Highlights
Concrete-filled steel tube columns have many advantages in terms of their high strength, high ductility, high stiffness and full usage of construction materials
Investigations of concrete-filled stainless steel tube columns are rarely found in the literature, especially using thin welded steel tubes
Hollow structural steel sections are often filled with concrete to form a composite column
Summary
Concrete-filled steel tube columns have many advantages in terms of their high strength, high ductility, high stiffness and full usage of construction materials. Investigations of concrete-filled stainless steel tube columns are rarely found in the literature, especially using thin welded steel tubes. Hollow structural steel sections are often filled with concrete to form a composite column. Traditional concrete filled steel columns employ the use of hot rolled steel sections filled with concrete. These columns have been used wide spread as they speed up construction by eliminating formwork and producing high load carrying [7]. This leads to use small steel wall thickness and more economy. The present work is a contribution to understand the behaviour of SSC filled cold formed thin short steel tubes subjected to axial compression
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