Simulation Analysis of Interfacial Shear Properties in 3D Printed Concrete-Mortar Interface

文章利用有限元对3D打印混凝土–砂浆试件进行了数值模拟分析，分析了试件的应力流动以及钢筋的损伤。结果表明，剪切贯穿力裂缝位于3D打印混凝土与普通混凝粘结界面处，横向抗剪钢筋发生屈服；有限元模拟破坏现象与试验吻合，3D打印混凝土与普通混凝土界面发生脱粘，横向抗剪钢筋在界面处发生屈服；K形界面与横向抗剪钢筋是剪力传递的主要参与者，3D打印层间界面对剪力传递影响不大。This study conducted a numerical simulation analysis of 3D-printed concrete-mortar specimens using the finite element method. The stress distribution and reinforcement damage were systematically investigated. The results demonstrate that shear-through cracks primarily occurred at the bonding interface between 3D printed concrete and ordinary concrete, with transverse shear reinforcement yielding. The failure patterns observed in finite element simulations showed good agreement with experimental results, revealing interface debonding between 3D printed concrete and ordinary concrete, along with yielding transverse shear reinforcement at the interface. The K-shaped interface and transverse shear reinforcement were identified as primary contributors to shear force transfer, while the interlayer interfaces of 3D-printed concrete showed negligible influence on shear transmission.