| 李之建,马国伟*,王里.3D打印连续微筋混凝土梁受弯承载力试验研究[J].实验力学,2021,36(4):516~524 |
| 3D打印连续微筋混凝土梁受弯承载力试验研究 |
| Experimental study on the bending capacity of 3D printed continuous micro-reinforcement reinforced concrete beams |
| 投稿时间：2020-07-19 修订日期：2020-09-29 |
| DOI：10.7520/1001-4888-20-143 |
| 中文关键词: 3D打印混凝土 微筋增强 抗弯承载力 加筋率 开裂荷载 |
| 英文关键词:3D concrete printing micro-reinforcement bending capacity reinforcement ratio cracking load |
| 基金项目:重大仪器研制项目(51627812)资助; 天津市自然科学基金（18JCZDJC39300） |
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| 中文摘要: |
| 连续微筋同步增强方法可有效提高3D打印混凝土结构的强度和延性，本文制备了3D打印连续微筋混凝土梁，试验研究了打印梁在四点弯曲作用下的变形和破坏规律，建立了开裂荷载和极限荷载的理论计算模型，并提出了结构正截面抗弯承载力的简化计算方法。研究结果表明：3D打印微筋混凝土梁的破坏模式属于少筋破坏，半截面加筋试件中的微筋全部屈服，全截面加筋试件中微筋的利用率随着打印层数的增加而增大。本文所建立的理论计算模型可以有效预测开裂荷载和极限荷载；所提出的简化计算方法对3D打印微筋混凝土结构正截面抗弯承载力的预测具有较高的精度；研究结果可为3D打印微筋混凝土结构设计提供参考。 |
| 英文摘要: |
| Continuous micro-reinforcement method improves the strength and ductility of 3D printed reinforced concrete structures effectively. In this paper, 3D printed Continuous micro-reinforcement reinforced concrete beams are developed, and the deformation and failure of the printed beams under four-point bending loading are experimentally studied. The theoretical calculation models of cracking and ultimate loads are established, and a simplified calculation method of the normal section bending capacity of the structures based on the reinforcement ratio is proposed. The results indicate that the micro-reinforcement reinforced 3D printed concrete beams exhibit less reinforced failure. All the micro-reinforcements in the half-section reinforced specimens yield, and the utilization rate of micro-reinforcements in the full-section reinforced specimens increases with the increase of the number for the printed layers. The established theoretical model can effectively predict the cracking and ultimate loads. The proposed simplified method has good accuracy in predicting the normal section flexural bearing capacity for micro-reinforcement 3D printed reinforced concrete structures. This research provides theoretical guidance for the design of micro-reinforcement 3D printed reinforced concrete structures. |
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