Abstract
Concrete filled steel tube (CFST) columns are widely used in civil engineering structures due to its abundant structural benefits like excellent seismic behaviour, ultimate load bearing capacity, fire resistivity, excellent ductility and energy absorption capacity, particularly in zones of high seismic risk. Due to their excellent engineering properties, CFST columns are used in buildings, bridges, electric transmission line and offshore structures. The ultimate load carrying capacity of CFST columns depends upon various parameters such as D/t ratio, steel grade, concrete grade, etc. Abaqus software is used for the finite element modelling of CFST Columns. In this study the ultimate axial load carrying capacity of CFST column is investigated by changing diameter-to-thickness (D/t) ratio, steel grade and concrete grade. Results shows that the ultimate load capacity decreases by increase in D/t ratio but increases by increase in steel grade and concrete grade.
Highlights
The concrete-filled steel tubular (CFST) column has in the recent years evolved as alternative to the conventional methods in vogue [1,2]
This paper presents the effect of different parameters like diameter to thickness ratio, steel grade and concrete grade, on the axial load carrying of CFST columns
This study is conducted on six circular CFST columns to investigate the effect of thickness variation on the performance of column
Summary
The CFST column has in the recent years evolved as alternative to the conventional methods in vogue [1,2]. Many researchers found that the CFST column system has numerous advantages compared with the ordinary steel or the reinforced concrete system due to its high-strength, stiffness, ductility, and better seismic performance [7,8,9]. The structural behavior of CFST elements are considerably affected by the difference between the Poisson’s ratios of the steel tube and concrete core. The steel tube has no confining effect on the concrete core. The ultimate axial load carrying capacity of CFST columns are being affected by many parameters such as the diameter to the thickness ratio, steel grade and concrete grade [6]. This paper presents the effect of different parameters like diameter to thickness ratio, steel grade and concrete grade, on the axial load carrying of CFST columns
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