Research on Bond-slip Relationship of 600 MPa Grade Steel Bar and High-strength Concrete
[1]Li Ke,Xu Chaoyang,Wu Kaixin,et al.Research on Bond-slip Relationship of 600 MPa Grade Steel Bar and High-strength Concrete[J].Journal of Zhengzhou University (Engineering Science),2021,42(02):55-61.[doi:10.13705/j.issn.1671-6833.2021.02.013]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42
Number of periods:
2021 02
Page number:
55-61
Column:
Public date:
2021-04-12
- Title:
- Research on Bond-slip Relationship of 600 MPa Grade Steel Bar and High-strength Concrete
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2021.02.013
- Abstract:
- In order to explore the bonding-slip relationship of 600 MPa grade steel with high strength concrete and to provide the theory basis for the application of reinforcing steel bar in concrete structure. The four groups of 42 specimens center drawing tests were conducted to explore the impact of concrete strength, steel bar anchoring length and thickness of concrete cover on the bonding-slip relationship.The results showed that the drawing failure modes of 600 MPa high strength steel bar in high strength concrete included three modes: pull-out failure, concrete splitting failure and steel yield failure.The bond-slip curve of reinforcement pull-out failure included rising section (including micro-slip section, slip section and splitting section), falling section, and residual section.The bond-slip curve of concrete splitting failure only included the ascending section (including micro-slip section, slip section and splitting section);Bond-slip curve of yield failure of steel bar, including rising section (including micro-slip section, slip section) and horizontal section.The ultimate drawing load included with the increase of concrete strength, anchorage length and diameter of steel bar under the condition of no yield failure.Based on the test results, the bond failure characteristics and bond-slip mechanism of 600 MPa steel bar and high-strength concrete were analyzed, and the bond-slip relationship model of 600 MPa steel bar and high-strength concrete under splitting failure condition and the calculation formula of model parameters were proposed. The proposed model and the calculation formula of model parameters were in good agreement with the test results.
- References:
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Last Update:
2021-05-30