Study on seismic behavior of angle steel connection joints for concrete-filled square steel tubular column

This paper presents a study on a new solution of steel-beam to CFST-column joint. The proposed solution could save space, avoid being cut off columns and have little influence on core concrete casting. Three specimens were tested. The hysteretic behavior of the joints was studied by tests and numerical analysis. The ductility and classification of the proposed joint were assessed. The analysis results showed that the failure mode of three specimens was the stiffener buckling and the tear of welding seams. Increasing angle thickness would increase the bearing capacity and initial stiffness of the joints, but decrease the rotation capacity of the joints. Increasing the angle length ratio could improve the seismic behavior of the joints. The rotation capacity of the joints could meet the requirements of seismic design and ductility design. According to two different classification systems, the proposed joint belongs to semi-rigid joint and exhibits good ductility.