Study on bond behavior between corroded reinforcement and concrete at elevated temperature

被引：0
|
作者：
Liu C. [1 ]
Yan L. [1 ]
Qiu Z. [1 ]
Miao J. [1 ]
Zheng C. [2 ]
Zhang C. [2 ]
机构：
[1] School of Civil Engineering, Qingdao University of Technology, Qingdao
[2] School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2024年 / 45卷 / 05期
关键词：
bond behavior; constitutive model; corroded rebar; high-temperature; natural cooling; pull-out test; reinforced concrete;
D O I：
10.14006/j.jzjgxb.2022.0570
中图分类号：
学科分类号：
摘要：
To investigate the degradation regular of bond behavior between corroded rebar and concrete at and after elevated temperature, 84 cube specimens and 110 eccentric pull-out specimens were made. The cube specimens were subjected to compressive strength test, and the eccentric specimens were subjected to pull-out test respectively. The influence of temperature condition (at and after high-temperature), corrosion levels (2%, 5%, and 10%), specimen size (cubic and prism specimen), and stirrup number (single and double stirrup) on the bond behavior were analyzed. The bond strength calculated method of corroded structures at high temperature is obtained, and the segmental and continuous bond slip constitutive models are proposed. Research indicates that the concrete compressive strength immersed for 56 d at 400 ℃ is reduced by 27. 6%, and the the bond strength of corroded specimen at 100 ℃ is 8% higher than that at 20 ℃, the bond strength decreases by 9% from 200 ℃ to 400 ℃, and the bond strength loss is 85% at 800 ℃ . When the temperature is below 400 ℃, the bond strength at elevated temperature is less than that after fire. When the temperature is higher than 400 ℃, the bond strengths under two temperature states are similar. The bond strength of a single stirrup specimen is 10% lower than that of a double stirrup specimen, and the energy consumption of little specimen is 54% of that of larger specimen. The accuracy of the model is verified by integral absolute error, the calculation error is less than 10%, and the calculated formula can provide a basis for the numerical calculation of corroded structures under fire. © 2024 Science Press. All rights reserved.
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页码：218 / 229
页数：11
相关论文
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