As a formwork-free construction method, 3D–printed concrete (3DPC) shows great advantages in forming complex structures; but encounters buildability problems. To address this, this paper presents a fluid-solid integrated peridynamic (PD) model to describe the fluid-to-solid transition of 3DPC. On this basis, an automatic strategy is proposed to deal with complex geometries. Programming by Python, PD particles are automatically generated by the input geometric model and arranged in a layer-wise manner for 3D printing simulation. The particles are then connected into inter- and intra-layer bonds to model the weak interface between layers. This establishes a connection between digital fabrication and PD simulation and offers a general way for 3DPC buildability analysis, which is assessed by the modeling of a 3D printing test and two digitally designed structures. The satisfactory results prove that the proposed method is applicable to structures with different geometries, thus enhancing the advantages of 3D printing.

中文翻译：

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使用近场动力学实现复杂 3D 打印混凝土几何形状的可建造性


3D打印混凝土（3DPC）作为一种免模板施工方法，在形成复杂结构方面显示出巨大优势；但遇到了可构建性问题。为了解决这个问题，本文提出了一种流固集成近场动力学 (PD) 模型来描述 3DPC 的流体到固体的转变。在此基础上，提出了处理复杂几何形状的自动策略。通过Python编程，PD粒子由输入的几何模型自动生成，并以分层方式排列以进行3D打印模拟。然后将粒子连接成层间和层内键，以模拟层间的弱界面。这在数字制造和 PD 模拟之间建立了联系，并为 3DPC 可构建性分析提供了一种通用方法，通过 3D 打印测试和两个数字设计结构的建模来进行评估。令人满意的结果证明该方法适用于不同几何形状的结构，从而增强了3D打印的优势。