3D concrete printing technology has been well developed and applied in various engineering fields. Anisotropy is one of the most important properties for the 3D printed cementitious material. Like fiber reinforced composite matters, if the material property is symmetric in only one plane, then the material is called as monoclinic with 13 independent elastic moduli in its constitutive law. In this study, multiscale finite element analysis of the monoclinic 3D printed cementitious material is made. Both material and geometrical randomness and uncertainty are quantified and investigated. At micro scale the material randomness is explored using nanoindentation technique. In addition, the geometrical uncertainty is analyzed through multiscale finite element method at meso scale. Then a stochastic finite element numerical experiment of 3D printed concrete simple supported beam under vertical loading is made based on the 13 independent stochastic elastic constants at macro scale. Computational methods proposed in this paper could be widely applied in 3D concrete printing industry.

3D混凝土打印技术在各个工程领域得到了很好的发展和应用。各向异性是 3D 打印胶凝材料最重要的特性之一。与纤维增强复合材料一样，如果材料性质仅在一个平面上对称，则该材料在其本构定律上称为具有13个独立弹性模量的单斜晶。在这项研究中，对单斜 3D 打印胶凝材料进行了多尺度有限元分析。材料和几何随机性和不确定性都被量化和研究。在微观尺度上，使用纳米压痕技术探索材料的随机性。此外，几何不确定性通过多尺度有限元方法在细观尺度上进行分析。然后基于宏观尺度的13个独立随机弹性常数，对3D打印混凝土简支梁在竖向荷载作用下进行了随机有限元数值试验。本文提出的计算方法可广泛应用于混凝土3D打印行业。