Shear behavior of partially encased steel-concrete composite specimens under tension

In order to study the longitudinal shear transfer behavior between the profile steel and the concrete encasing the steel web under tension, the failure modes and the load-slip curves were analyzed by the axial tension tests of six partially encased steel-concrete composite specimens. The parameters studied mainly included the bond length between the profile steel and the concrete, the concrete strength, as well as the number of stud connectors. The experimental results indicate that the failure of the partially encased steel-concrete composite specimens is mainly caused by concrete crushing, bond failure and shear failure of the stud. Under axial tension test and push-out test, the bond strength of specimens with no shear stud increases with the increasing of the bonding length between the profile steel and the concrete. The shear capacity of the specimens increases in an approximately linear relationship with the increasing of the tensile strength of the concrete in axial tension tests and push-out tests. The shear capacity of the specimens increases with the increasing of the number of studs. Compared with specimens without shear stud, the shear capacity of the specimens with two studs and four studs was increased by nearly 100% and 250%, respectively.