concrete filled steel tube columns (cfst) are a kind of composite columns according to advantages of cfst relative to reinforced concrete and steel columns. use of these materials is common in recent years especially in high building, unnecessary of molding, high ductility, proportionate resistance with low volume, economical, low deformation relative to steel columns are among advantages. in t...

In order to quantitatively evaluate the shear-bearing capacity of shear connectors of square concrete filled steel tube (CFST), push-out tests on 14 square CFSTs with shear connectors have been carried out. Among the 14 CFSTs, there are 13 specimens with steel plate connectors and one specimen with steel bar connectors. The following factors are investigated to figure out their influences on th...

Concrete-filled steel tubular (CFST) columns are composite sections that may contribute to reduce the environmental impact in construction through a more efficient use of resources. By embedding profile inside CFST section, new typology is generated, so-called steel-reinforced concrete-filled (SR-CFST) columns, which enhance not only structural capacity these at room temperature but also their ...

This study aims to investigate the seismic behavior of concrete-filled steel tubular (CFST)-laced piers; after verifying model through engineering tests, simplified finite element models (S-FEM) and refined ones (R-FEM) with CFST-laced piers are developed in this manuscript, respectively. Through comparison, it is found that S-FEM can effectively improve analyzing efficiency while meeting requi...

Concrete-filled steel tube (CFST) columns are frequently used in construction due to their high ductility and improved loadbearing capacities. At beam-to-CFST column joints, gusset plates welded the outer face of tube, specific elements should ensure shear transfer between inner concrete core. The current systems studs, internal rings, angles, plates, bars, tab stiffeners, etc. Although good, t...

Numerous existing formulas predicted the ultimate interfacial bond strength in concrete-filled steel tubes (CFST) between and concrete core without investigating whole response under push-out load. In this research, four models are proposed to predict behavior CFST including post-peak branch loading test based on 157 circular specimens 105 squared from literature. Two (one for one CFST) develop...

The sections composed of concrete and steel, which include concrete-encased concrete-filled tubes, generally have defects due to the low tensile strength of concrete. Therefore, an appropriate method was used for the combination of concrete-filled tubes (CFT) and prestressing strands which is encased in concrete. The conventional design guidelines are commonly developed for materials with norma...