Parametric Study on the Lateral Load Carrying Capacity of CFST Columns

摘要

Use of Concrete filled steel tube (CFST) columns are increasing 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, especially in zones of high seismic risk. Numerical study on seismic behaviour of CFST columns are presented in this paper. OpenSEES is used to model the CFST columns. Changing the different parameters like diameter-to-thickness ratio (D/t) ratio, steel grade, concrete grade, slenderness ratio and axial force ratio lateral load carrying capacity of CFST columns under cyclic load is investigated. Results shows that the lateral load capacity significantly increased by D/t ratio, increase in steel grade and decrease in slenderness ratio and noticeable increase due to increase of concrete grade and decrease in axial force ratio.