Study on Failure Evolution Law of Reinforcing Bar Connection Interface of Precast Structure
[1]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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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42卷
Number of periods:
2021 02
Page number:
25-30
Column:
Public date:
2021-04-12
- Title:
- Study on Failure Evolution Law of Reinforcing Bar Connection Interface of Precast Structure
- Keywords:
- anchor connection; DSCM; drawing test; deformation field; strain field
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2021.02.010
- 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.
- References:
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Last Update:
2021-05-30