FINITE ELEMENT ANALYSIS OF SHEAR WALLS WITH PRECAST CONCRETE HOLLOW MOULDS AND SPLICE REBAR CONNECTION BETWEEN THE UPPER AND LOWER FLOORS

Different methods in ABAQUS available for simulating the behavior of new and old concrete interfaces are discussed. Definition methods of surface model's parameters for finite element analysis are suggested and verified by predicting the existing experimental results. Based on the simulation method of the new and old concrete interfaces, the finite element analysis method of shear walls with precast concrete hollow moulds and splice rebar connection is verified. Based on the finite element pushover analysis of shear walls under constant axial loading and monotonic horizontal loading, the parametric study on the mechanical behavior of the shear walls considering the effects of rebar splice length, the total tension capacity of splice rebars, the position of splice rebar's top end, the strength of cast-in-place concrete and axial force ratio is carried out. The results indicate that the adopted finite element analysis methods for the new and old concrete interfaces and shear walls are reasonable and reliable. The splice length of 1.2 times the anchorage length of splice rebar can satisfy the minimum requirements. The strength capacity of the shear wall can be improved and the severe tension crack zone moves up and extends inwards by increasing the total tension capacity of splice rebars. To assure the strength capacity of the shear wall, the strength of cast-in-place concrete should not be lower than that of precast concrete. The zone of compression damage expands and the stability and deformability of the strength capacity are affected when the axial force ratio of shear wall is large. It is suggested that more transverse tie rebars or horizontal distributed rebars should be placed at the bottom of the shear wall to improve the seismic performance of the shear wall.