建筑结构学报2025，Vol.46Issue(6)：211-222,12.DOI:10.14006/j.jzjgxb.2024.0462
高温水冷作用下钢筋与混凝土间黏结性能试验研究
Experimental study on adhesion performance between steel bar and concrete under high-temperature water cooling conditions
摘要
Abstract
To study the effect of high temperature and water spray cooling on the bond performance of reinforced concrete,153 pull-out specimens were designed,considering factors such as concrete strength,stirrup count,cover thickness and bond length.High-temperature(20,200,400,500℃ and 700℃)and cooling tests(natural and water spray)were conducted to evaluate their impact on bond performance,and a damage model was developed.Results show that the specimens cooled with water spray have 22％ lower bond strength than those cooled naturally.When heated to 700℃,the specimen with the steel bar at the side middle has a relative bond strength 6.51％lower than that with the bar at the center,but 5.50％higher than that with the bar at the side corner.Scanning electron microscopy(SEM)images show that water spray cooling accelerates crack development,reducing bond strength.Finally,a bond strength calculation formula and a bond-slip model were established,considering the synergistic effect of high temperature and water cooling.The root mean square error(RMSE)between the calculated and experimental data is 0.568,the mean absolute percentage error(MAPE)is 5.482％,and the goodness of fit R2 is 0.98.关键词
钢筋混凝土/黏结退化/高温试验/冷却方式/黏结-滑移本构模型Key words
reinforced concrete/bond degradation/fire test/cooling method/bond-slip constitutive model分类
建筑与水利引用本文复制引用
刘才玮,郑建新,赵可欣,闫良泰,苗吉军,郑春英..高温水冷作用下钢筋与混凝土间黏结性能试验研究[J].建筑结构学报,2025,46(6):211-222,12.基金项目
国家自然科学基金项目(52178487),山东省自然科学基金项目(ZR2021ME228). （52178487）
