In this paper an experimental program on concrete-filled steel tubular columns subjected to eccentric loads is presented. The have different cross-sectional configurations, including single (CFST) and dual (CFDST). response of all the was studied physical state specimens after tests checked. level utilisation achieved by each type column in relation its resistance analysed together with influen...

Abstract Concrete-filled steel tube columns are widely used in civil engineering structures due to their excellent ductility, energy absorption capacity, ultimate load-bearing and seismic behavior. In this paper, a numerical study modeling of eight lightweight concrete conventional filled tubes was carried out using ABAQUS software, the lateral load-carrying capacity square circular under cycli...

Addition of steel fibers to high strength concrete (HSC) improves its post-peak behavior and energy absorbing capability, which can be described well in term of toughness. This paper attempts to obtain both analytically and experimentally the efficiency of steel fibers in HSC columns with hybrid confinement of transverse reinforcement and steel fibers. Toughness ratio (TR) to quantify the confi...

Concrete-filled steel tubular columns have garnered wide interest among researchers due to their favorable structural characteristics. To attain the best possible performance from concrete-filled while reducing cost, use of optimization algorithms is indispensable. In this regard, metaheuristic are finding increasing application in engineering high efficiency. Various equations that predict ult...

Accurate constitutive models of the constituent materials in a reinforced concrete (RC) section, namely, unconfined concrete, confined concrete and reinforcing steel are necessary in fiber-based discretization of RC components for use in nonlinear analysis of RC structures. This paper examines the sensitivity to different constitutive models in predicting the inelastic seismic behavior of RC fr...

The mechanical behaviors of recycled aggregate concrete (RAC) are upgraded by outer steel tube confinement, and the performance concrete-filled tubular (RACFST) columns is similar to that traditional (CFST) columns. purpose this study investigate rectangular (RACFRST) stub under axial loading. Three-dimensional finite element (FE) models were established, which utilized a triaxial plastic-damag...