HRB400 grade rebar;  continuous beams;  Plastic internal force redistribution

Through the test of four HRB4 reinforced concrete two-span continuous beams, the failure morphology and deformation characteristics of the specimens were observed, and the test results were discussed and analyzed, and the plastic internal force redistribution characteristics of this structure were studied. The experimental results show that the HRB400 reinforced concrete two-span continuous beam can achieve complete bending moment redistribution, and has sufficient amplitude modulation capacity to achieve the designed amplitude modulation coefficient. This paper proposes that the crack width should be used as the control condition for the amplitude modulation of the bending moment of this structure.