Experimental study on the seismic performance of the new fully-bolted beam-column joint

Abstract

This paper proposed a new fully-bolted core tube beam-column joint, and the seismic performance and structural measures of the joint were investigated. Four specimens were tested under cyclic loads, including a traditional column-through joint as a control group, an improved traditional joint and two new joints, and the effects of the beam section, axial compression ratio, the wall thickness and height of the inner sleeve on the seismic performance of the new joints were studied by experiments and numerical simulation. According to the results, although the improved traditional column-through joint showed good load-bearing behavior, it was prone to brittle failure. The fully-bolted core tube beam-column joint had better ductility and energy dissipation capacity than the traditional joint, and was more suitable for high-intensity seismic areas. Enlarging the beam section and increasing the inner sleeve height can improve the bearing capacity and energy dissipation capacity, while the inner sleeve wall thickness and axial compression ratio had relatively little influence on the seismic performance of the joint. Furthermore, increasing the thickness of the inner sleeve wall can intensify the stress concentration at the column end, which was not conducive to the seismic resistance of the structure. Simplified formulas for the yield and ultimate loads of the new fully-bolted core tube joint were proposed.