纤维增强3D打印混凝土受剪破坏数值模拟

Numerical Simulation of the Failure Behavior of 3D-printed Concrete with Fiber Reinforcement

为评估3D打印建筑结构可靠度,利用纤维增强混凝土多尺度耦合数值分析平台,对纤维增强3D打印混凝土部件受剪破坏行为展开数值模拟。根据成型方式与打印材料组合设置不同算例,着重比较部件的破坏方式与抗损性能。模拟结果表明:添加纤维能显著提高混凝土裂后韧性;受制于薄弱的层间粘结,普通3D打印混凝土抗剪能力逊于一体浇筑成型混凝土;通过使用纤维对层间界面进行强化,打印成型混凝土的抗损性能可获得明显改善。数值模拟为提高3D打印建筑结构可靠性提供了理论思路。

For the reliability assessment of 3D-printed building structures ,failure analyses of fiber-re- inforced 3D-printed concrete components subjected to shear load are conducted, by employing a mul- tiscale-oriented numerical simulation platform for fiber-reinforced concrete. A series of test scenarios characterized by different construction material and technology are assumed and simulated, with the focus on the comparison of failure pattern and damage-resistance properties. It is observed that, the post-cracking toughness of concrete material is significantly enhanced by the addition of fibers;the weak interlayer cohesion leads to the inferior shear resistance of normal 3D-printed concrete as com- pared to that cast as a whole;however, if the interlayer interfaces are appropriately strengthened, the damage-resistance performance of printed concrete is remarkably enhanced. The numerical simulation provides a theoretical approach to the increase of the reliability of 3 D-printed building structures.