Hysteresis and skeleton curves of the specimens is showed in Fig.3. In this case, good elastic is maintained and energy dissipation capacity is small before the displacement reaches 8mm. When it reaches 24mm, the pinching phenomena of hysteresis curves emerged. The phenomena are more and more obvious as the displacement increases. It indicates that the stiffness of the components falls down because of the opening cracks of tensile in the early period of reverse loading after yielding of the steel bar in the core area where the bond deterioration becomes more obvious. After the cracks close in the beam tip, the concrete of compression zone comes to work and the stiffness is increased. The number of cycles increases and the stiffness falls down under the same step. The skeleton curve does not have obvious yielding step. The failure of the joint is both the bending failure of column tip and shearing failure of core area, which is consistent with the experimental conclusion.