建筑结构学报2025，Vol.46Issue(9)：242-252,11.DOI:10.14006/j.jzjgxb.2024.0455
锈蚀、冻融与疲劳多因素共同作用对钢绞线-混凝土黏结强度的影响研究
Study on combined effects of corrosion,freeze-thaw,and fatigue on bond strength between steel strands and concrete
摘要
Abstract
Focusing on the bond-slip behavior and material damage characteristics at the steel strand-concrete interface in offshore freeze-thaw environments,the damage caused by the combined effects of corrosion,freeze-thaw cycles,and fatigue was investigated in this study.Based on an orthogonal experimental design,ten short-bonded beam specimens were designed.After being subjected to combined multi-factor damage,the specimens underwent static loading to assess their bond strength.The results indicate that among the multiple factors,corrosion rate,fatigue stress level,number of freeze-thaw cycles,and number of fatigue cycles affect the bond strength at the steel strand-concrete interface in descending order of influence.Specifically,bond strength decreased by approximately 27.16％as the corrosion ratio increased from 0％to 7.5％,and by 23.09％as it further increased from 7.5％to 15％.Fatigue damage exhibited nonlinear characteristics;higher initial stress levels significantly increased damage and reduced bond strength,but the rate of strength reduction diminished with further increases in stress.The combined action of multiple factors significantly affected the slip displacement at the steel strand-concrete interface,with corrosion ratio having the greatest impact,followed by fatigue cycle number,fatigue stress level,and freeze-thaw cycle number.Based on the experimental bond-slip curves,a constitutive model for bond strength degradation under the combined action of multiple factors was developed.The model demonstrates high fitting accuracy and effectively describes the degradation characteristics.关键词
RC结构/钢绞线/多因素共同作用/氯盐侵蚀/冻融作用/疲劳/黏结强度Key words
RC structure/steel strand/multi-factor coupling action/chloride penetration/freeze-thaw action/fatigue/bond strength分类
建筑与水利引用本文复制引用
杨俊,郭彤,叶新宇,刘中祥,于树奇..锈蚀、冻融与疲劳多因素共同作用对钢绞线-混凝土黏结强度的影响研究[J].建筑结构学报,2025,46(9):242-252,11.基金项目
国家自然科学基金项目(52208319,52125802),中国博士后科学基金面上资助项目(2023M730582),东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题(CPCSME2024-06). （52208319,52125802）
