Shear mechanism and capacity calculation on SRC special-shaped joints

Abstract

In this paper, 15 specimens of steel reinforced concrete (SRC) joints were tested under horizontal cyclic loading. The failure modes of different types of SRC special-shaped joints, and the shear mechanism and capacity of the joint were analyzed. The effects of axial compression ratio, dislocation height of the beam, the sectional height difference of beams, the sectional height difference of columns, the inclination angle of leaning beams and other factors on the shear bearing capacity of joints were studied. Furthermore, based on the experimental study, the finite element analysis (FEA) method was used to verify the experiment, and 14 finite element models (FEMs) were established for parameter analysis. The results indicate that the shear capacity of the joints was mainly borne by webs, stirrups and concrete inclined-compression-struts. Ultimately, the shear mechanism analysis model of SRC special-shaped joints was proposed, and the shear capacity calculation formulas of SRC special-shaped interior joints, variable-column exterior joints and leaning beam-column exterior joints were established. The proposed shear capacity calculation formulas can be adopted to assess the shear capacity of SRC special-shaped joints.