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| Effect of 3D printing path on mechanical properties of arch concrete bridge |
Xiao-yan SUN1( ),Gui TANG1,Hai-long WANG1,*(),Qun WANG2,Zhi-cheng ZHANG1 |
1. School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Zhejiang Greentown Architectural Design Co. Ltd, Hangzhou 310007, China |
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Abstract The CT scanning technology was adopted to analyze the microstructure of a 3D printed concrete in order to figure out the influence of printing path on the mechanical properties of the 3D printed concrete arch bridge. The effect of printing path on the pore distribution of printed arch structure was investigated, and the approximate porosities of interlayer and inter-strip were obtained on the basis of canned images. Based on the fine finite element numerical simulation analysis, the effects of lengthwise printing, combination printing and horizontal printing on the bearing capacity were obtained and compared with that of cast-in-place concrete arch. The results show that the printing path has a direct effect on the distribution and the number of defects in the interlayers and strip layers. The amount of inter-strip defects is obviously lager than that in interlayers. The bearing capacity of printed arch is linearly related with the porosity of printed concrete. The lengthwise printing concrete arches were tested, the numerical simulation had a good agreement with the experimental result. The relative error of peak load was 8.0%, the relative error of mid span displacement was 11.9%, and the failure mode and failure position were consistent with the test results. For the lengthwise printed arch, the dominant defect originates from the interlayer, resulting the smallest defect area and largest bearing capacity.
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Received: 23 September 2019
Published: 15 December 2020
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Corresponding Authors:
Hai-long WANG
E-mail: selina@zju.edu.cn;hlwang@zju.edu.cn
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3D打印路径对混凝土拱桥结构力学性能的影响
为了分析打印路径对3D打印混凝土拱桥力学性能的影响机制，采用CT技术对3D打印混凝土进行微观扫描分析，探讨打印路径对成型后结构孔隙空间分布的影响规律，得到层间、条间缺陷层的近似孔隙率.基于数值模拟分析，对比纵向打印、组合打印、横向打印以及浇筑对混凝土拱桥结构承载性能的影响规律. 结果表明：打印路径直接影响层间缺陷和条间缺陷的数量和分布，打印拱结构的承载能力与打印体的孔隙率线性相关. 条间缺陷对承载能力的影响明显大于层间. 纵向打印路径数值模拟与模型试验结果吻合良好，峰值荷载相对误差为8.0%，跨中位移相对误差为11.9%，破坏形态与失效位置一致. 对于拱桥结构，纵向打印的缺陷类型以层间为主，且缺陷层总面积最小，承载力性能最好.
关键词：
3D打印,
混凝土,
拱桥,
承载性能,
CT扫描
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