[1]李可,徐朝阳,吴凯鑫,等.600MPa级钢筋与高强混凝土粘结-滑移关系研究[J].郑州大学学报(工学版),2021,42(2):54-60.[doi:10.13705/j.issn.1671-6833.2021.02.013]
　Li Ke,Xu Zhaoyang,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(2):54-60.[doi:10.13705/j.issn.1671-6833.2021.02.013]

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600MPa级钢筋与高强混凝土粘结-滑移关系研究()

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2期

页码:

54-60

栏目:

出版日期:

2021-04-12

文章信息/Info

Title:

Research on Bond-slip Relationship of 600 MPa Grade Steel Bar and High-strength Concrete

作者:

李可¹,徐朝阳¹,吴凯鑫²,王新玲¹

1.郑州大学 土木工程学院，河南 郑州 450001；2.中国电建集团华东勘测设计研究院，浙江 杭州 311122

Author(s):

Li Ke¹; Xu Zhaoyang¹; Wu Kaixin²; Wang Xinling¹;

1.School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 2.Power China Huadong Engineering Corporation, Hangzhou 311122, China

关键词:

600 MPa级钢筋; 高强混凝土; 黏结-滑移模型; 拉拔试验; 模型验证

Keywords:

font-family: Calibri; ">600 MPa grade steel bars;  high strength concrete;  bond-slip model;  pull-out test;  model-validation

DOI:

10.13705/j.issn.1671-6833.2021.02.013

文献标志码:

A

摘要:

为了探究 600MPa 级钢筋与高强混凝土黏结 -滑移关系，为 600MPa 钢筋在混凝土结构的应用提供理论依据，通过 4 组 42 个试件进行中心拉拔试验，研究混凝土强度、钢筋锚固长度以及混凝土保护层厚度等因素对 600MPa 级钢筋与高强混凝土黏结 -滑移关系的影响规律。结果表明： 600 MPa级钢筋在高强混凝土中的拉拔破坏模式包括钢筋拔出破坏、混凝土劈裂破坏、钢筋屈服破坏3种模式；钢筋拔出破坏的黏结-滑移曲线包含上升段（包括微滑移段、滑移段、劈裂段）、下降段和残余段；混凝土劈裂破坏的黏结-滑移曲线只包含上升段（包括微滑移段、滑移段、劈裂段）；钢筋屈服破坏的黏结-滑移曲线包含上升段（包括微滑移段、滑移段）和水平段。在不发生钢筋屈服破坏情况下，极限拉拔荷载随混凝土强度、锚固长度、钢筋直径的增加而增大。基于试验结果，分析600MPa级钢筋与高强混凝土黏结破坏特征和黏结-滑移机理，提出了劈裂破坏情况下600MPa级钢筋与高强混凝土的黏结-滑移关系模型及模型参数的表达式，所提模型及模型参数表达式与试验结果吻合良好。

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.

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