Seismic performance of a new assembled beam-column joint with cantilever beam splicing

Abstract

Assembled steel structure is widely used as in green building structure with life cycle significance. As the key link in steel structure design, the beam-column joint design has been studied. This paper proposes a new assembled beam-column joint with cantilever beam splicing, four specimens with full sizes were designed. The influence of beam cantilever splicing, the stiffener, and joint direction on seismic performance of the joints were discussed by cyclic loading tests and numerical simulations. Then the sensitivity of key parameters is carried out. The results indicate that the joint with double stiffener in the cantilever beam splicing did not significantly improve the seismic performance of the specimen compared to using a single stiffener; and the initial stiffness was not significantly affected when increasing the length of the L-shaped member. In addition, the stiffness, bearing capacity, and the ductility and bearing capacity of the specimen with weak connection were lower 28.3% and 11.8%, respectively, compared with the joints with strong connection. Parameter analysis showed that increasing the length and thickness of the L-shaped member can effectively improve the seismic performance of the joint, However, the thickness of cantilever beam splices had a small impact on mechanical property. Changing the number of bolts on the flanges of beam had a greater effect on the bearing capacity of the joint. Substituting the initial stiffness of the joint into the EC3 moment-rotation model, the results show that the calculated results are in good agreement with the simulation results and the experimental results.