考虑配筋的3D打印混凝土墙体抗震性能研究OA

In order to explore the seismic performance of 3D printed concrete walls(3DPCW),this study conducted mechanical property tests on the interlayer interface of 3D printed concrete using four different aggregate gradations were carried out.Six wall models with horizontal/vertical reinforcement,vertical/oblique connecting ribs and hollow structures were designed,and a refined model of interlayer interface damage and bond-slip based on Cohesive element was established.The hysteretic characteristics,skeleton curve,displacement ductility,stiffness degradation and energy dissipation capacity of 3DPCW under low cyclic loading were systematically analyzed.The results show that the interlaminar shear strength and tensile strength of the specimens increase significantly with the increase of the proportion of coarse aggregate.The damage mode of the wall is dominated by the arrangement of steel bars.The damage is concentrated in the reinforcement area,and the location is different in the middle and lower parts,the middle sides or the ribs due to the different sections and reinforcement methods.The vertical connection rib wall is superior to the hollow and oblique connection rib wall in terms of initial stiffness,stiffness degradation and ductility.Its cross-section form is conducive to stress dispersion and uniform development of cracks,thereby improving energy dissipation and deformation capacity.The seismic performance of the vertical reinforced wall is better than that of the horizontal reinforced wall as a whole,which shows that the hysteresis curve is fuller,the peak value of the skeleton curve is higher,the displacement ductility is better,the stiffness degradation is slower,and the energy dissipation capacity is stronger,which can effectively suppress the interlayer slip and improve the ductility.The research conclusions provide a theoretical basis and a numerical simulation reference for 3DPCW seismic design.