Experimental research on seismic damage of T-shaped CFST column to steel beam joints

Abstract

To investigate the seismic damage of T-shaped concrete-filled steel tubular (CFST) column to steel beam joints, eight specimens with the scale of 1/2 were tested under various loadings. The failure modes, load–displacement curves, energy dissipation capacity, cyclic strength degradation, and strain distribution are analyzed. The test results indicate that the failure pattern of the specimens is mainly the shear failure of the joint panel zone and the fracture of the beam end. The hysteretic curves have no remarkable pinch effect, and the joints have excellent energy dissipation capacity. The shear bearing capacity and shear deformation capacity of specimens improve with the growth of depth to width ratio. The seismic damage of specimens with a bigger depth to width ratio develops more slowly. During the mixed loading, the monotonic deformation capacity of specimens decreases significantly with the increase of seismic damage of cyclic loading. Under cyclic loading with constant amplitude, the accumulative damage plays a major role in the failure of the specimens, and the specimens under a bigger constant amplitude are more prone to failure. The column web within the joint panel zone shows a larger damage degree than the column limb.