芯柱式3D打印混凝土墙轴心受压性能试验研究OA北大核心CSTPCD

The core columns can improve the bearing capacity of ordinary masonry walls.To explore the feasibility of applying core columns in 3D printed concrete walls,composite walls of 3D printed concrete reinforced hollow walls and cast-in-place reinforced concrete core columns were designed.The effects of cross-section form(i.e.,vertical ribs,diagonal ribs and composite ribs)and the number of core columns(i.e.,two-core columns,three-core columns and five-core columns)on the axial compression performance of 3D printed concrete walls were studied.The results show that the failure modes of the wall can be categorized into three types,that is,the bottom crush of one side of the wall,the top half crush and spalling of one side of the wall,and the overall damage of the wall.The cross-section form of the vertical and diagonal combination of ribs has the best mechanical performance,which can improve the integrity and bearing capacity of the wall.The increase of the number of core columns can significantly improve the bearing capacity of the wall,by 16.3％-19.1％,but the dispersed arrangement of core columns will weaken the integrity of the wall and reduce the cracking load of the wall by 34.3％-48.5％.By comparing the bearing capacity calculation formulas of different codes,it is found that the bearing capacity calculated according to the reinforced block masonry wall is in good agreement with the experimental value,and the error is less than 8.5％.ABAQUS was used to simulate and analyze the specimens,and the mechanical properties of the weak plane between the material layers were reduced by setting the defect layer.The difference between the simulation results and the experimental results is less than 10％,indicating that the model is accurate and can be used to estimate the bearing capacity of 3D printed concrete walls with core columns.