3D打印混凝土永久模板叠合柱的抗压性能数值模拟研究

为深入研究3D打印混凝土永久模板叠合柱的抗压性能，基于3D打印混凝土永久模板叠合柱及同尺寸整体现浇对照柱试验建立构件数值模型，模拟分析其轴压荷载-位移响应及失效形态。针对界面粘结性能、现浇混凝土抗压强度、打印模板厚度、荷载偏心距等参数开展3D打印混凝土永久模板叠合柱的抗压性能计算分析，研究表明：叠合柱轴压极限承载力随着薄弱界面剪切强度、刚度及现浇混凝土抗压强度的增大而增大。由于打印材料的抗压强度高于现浇混凝土，叠合柱抗压极限承载力提升率与打印模板厚度呈近似线性关系，叠合圆柱的抗压极限承载力随着荷载偏心距的增大而降低，呈近似线性负相关。此外，偏心距对叠合圆柱极限承载力下降幅度的影响大于现浇圆柱。

Numerical simulation analysis on compressive performance of composite columns with 3D printed concrete permanent formwork

In order to further investigate the compressive performance of composite columns with 3D printed concrete permanent formwork, an interface based finite element (FE) model was established to analyze the load-displacement response and failure mode of composite columns and the same size cast-in-place columns under axial compression on the basis of the experiment. The parameter sensitivity analysis of composite columns with 3D printed concrete permanent formwork was carried out with consideration of the interface bonding property, compressive strength of cast-in-place concrete, thickness of printing template, and load eccentricity. Results showed that the ultimate axial compression bearing capacity of composite columns increased with the development of shear strength, stiffness of interface and compressive strength of cast-in-place concrete. As the compressive strength of the printing material is higher than that of the cast-in-place concrete, the compressive ultimate bearing capacity of the composite column appeared approximately linear growth with thickness of printing template, and negative linear correlation with the load eccentricity. In addition, the influence of eccentricity on the reduction of the ultimate bearing capacity of composite columns is greater than that of cast-in-place columns.