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Characterizing and modelling the bond-slip behaviour of steel bars in 3D printed engineered cementitious composites
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-22 , DOI: 10.1016/j.cemconcomp.2025.105936
Meng Chen, Kanghao Yu, Tong Zhang, Yuting Wang

Embedding rebars in 3D printed engineered cementitious composites (3DP-ECC) promises to improve the structural toughness and loading capacity, while a robust bond between them is critical for digital construction with reinforcements. This paper presents a series of pull-out tests on the bond behaviour between rebars and 3DP-ECC to investigate the effects of variable rebar arrangement direction, diameter and anchorage length. Results indicate that the failure patterns mainly showed pull-out failure due to the lower probability of interlayer splitting failure caused by the improved interlayer fracture resistance capacity in 3DP-ECC compared to ordinary 3D printed concrete. The rebar direction most significantly affected the slip stage in the bond stress-slip curve, whereas the rebar diameter and anchorage length had almost no effect on the curves. The bond strength of the printed specimens in the parallel direction enhanced by 2.9%–10.5 % than that in the vertical direction, while it declined by 27.4%–27.6 % as the rebar diameter increased from 8 to 14 mm. Moreover, a bond-slip constitutive model for steel bar reinforced 3DP-ECC was established to predict the bond behaviour as a function of the rebar location and physical characteristics. The exploration of the bond behaviour and constitutive relationships of steel bar reinforced 3DP-ECC provides a basis for integrated performance evaluation in practical application.

中文翻译:


表征和模拟 3D 打印工程水泥基复合材料中钢筋的粘结滑移行为



在 3D 打印工程水泥基复合材料 (3DP-ECC) 中嵌入钢筋有望提高结构韧性和承载能力,而它们之间的牢固粘合对于增强数字建筑至关重要。本文提出了一系列关于钢筋和 3DP-ECC 之间粘合行为的拉拔测试,以研究可变钢筋布置方向、直径和锚固长度的影响。结果表明,与普通 3D 打印混凝土相比,3DP-ECC 的层间抗断裂能力提高,导致层间劈裂失效的可能性较低,因此破坏模式主要表现为拉出失效。钢筋方向对粘结应力-滑移曲线中的滑移阶段影响最显著,而钢筋直径和锚固长度对曲线几乎没有影响。打印试样在平行方向上的粘结强度比垂直方向提高了 2.9%–10.5 %,而随着钢筋直径从 8 mm 增加到 14 mm,打印件的粘结强度下降了 27.4%–27.6 %。此外,建立了钢筋加固 3DP-ECC 的粘结滑移本构模型,以预测粘结行为与钢筋位置和物理特性的函数关系。对钢筋增强 3DP-ECC 的粘结行为和本构关系的探索为实际应用中的综合性能评估提供了基础。
更新日期:2025-01-22
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