[1]李悦、孟文君、高崇铭、吴琦琦.装配式结构钢筋连接界面的破坏演化规律研究[J].郑州大学学报(工学版),2021,42(02):25-30.[doi:10.13705/j.issn.1671-6833.2021.02.010]
　Li Yue,Meng Wenjun,Gao Chongming,et al.Study on Failure Evolution Law of Reinforcing Bar Connection Interface of Precast Structure[J].Journal of Zhengzhou University (Engineering Science),2021,42(02):25-30.[doi:10.13705/j.issn.1671-6833.2021.02.010]

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装配式结构钢筋连接界面的破坏演化规律研究()

分享到：

《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

42

期数:

2021年02期

页码:

25-30

栏目:

出版日期:

2021-04-12

文章信息/Info

Title:

Study on Failure Evolution Law of Reinforcing Bar Connection Interface of Precast Structure

作者:

李悦、孟文君、高崇铭、吴琦琦

北方工业大学土木工程学院;

Author(s):

Li Yue; Meng Wenjun; Gao Chongming; Wu Qiqi;

School of Civil Engineering, Northern University of Technology;

关键词:

浆锚连接;  DSCM;  拉拔试验;  变形场;  应变场

Keywords:

anchor connection;  DSCM;  drawing test;  deformation field;  strain field

DOI:

10.13705/j.issn.1671-6833.2021.02.010

文献标志码:

A

摘要:

为了获取装配式混凝土结构钢筋浆锚连接界面的破坏演化规律，借助数字散斑相关方法（DSCM），对装配式混凝土结构进行了纵向钢筋浆锚连接拉拔试验。通过观测钢筋浆锚连接的破坏过程，并对散斑图像进行分析，研究了装配式混凝土结构浆锚连接钢筋受力变形演化特征、锚固体系受力位移场演化特征、锚固体系受力应变场演化特征。研究结果表明：1）同一粘结剂孔径的试件其钢筋所受拉拔力随锚固深度增加而减小，应变随拉拔力增加而逐渐增大；2）锚固体系的变形主要集中于灌浆料区域内，锚固深度越大，钢筋受拉拔力影响越弱，灌浆料区域变形值越小；3）锚固体系中，灌浆料区域应变值沿锚固深度向自由端传递，且应变值随拉拔力增加而增大；4）拉拔过程中，试件第一主应变和最大剪切应变从加载端钢筋周围向四周扩散，最终扩散至混凝土基体与灌浆料粘结界面处，直至与粘结界面处的应变值相衔接。

Abstract:

In order to obtain the failure evolution law of the reinforced grout anchor connection interface of prefabricated concrete structures,a longitudinal steel bar anchor connection test was carried out on a prefabricated concrete structure by the digital speckle correlation method (DSCM).By observing the failure process of steel bar anchor connection and analyzing the speckle image, the evolution characteristics of the stress of the fabricated concrete structure anchor, the evolution characteristics of the force field of the anchor system, and the evolution characteristics of the strain field of the anchor system were studied.The results showed that: ① The thickness of the anchoring agent would affect the failure mode and the ultimate bearing capacity of the anchoring system. ② In the anchoring system, the pulling force was continuously transmitted along the steel bar from the loaded end to the free end, and the greater the thickness of the anchoring agenthas, the greater the transmission rangeis. ③ During the drawing process, the deformation of the anchoring system was mainly concentrated at the interface between the anchoring agent and the concrete, and expanded along the steel bar to the inside of the system as the load increases. ④ Under the pulling force, in the initial, the first principal strain and the maximum shear strain mainly existed in the grouting area around the reinforcement at the loading end. As the pulling force increased, the strain expanded to the bonding interface between the concrete matrix and the grouting material until it connects with the strain at the bonding interface.

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