Corrosion-Fatigue Life Prediction Modeling for RC Structures under Coupled Carbonation and Repeated Loading
Corrosion-Fatigue Life Prediction Modeling for RC Structures under Coupled Carbonation and Repeated Loading
复制标题
耦合碳化和重复加载下 RC 结构的腐蚀疲劳寿命预测模型
DOI：
10.3390/math9243296
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发表时间：
2021-12-01
期刊：
影响因子：
2.4
通讯作者：
Yu, Zhiwu
中科院分区：
文献类型：
--
作者：
Cui, Chenxing;Song, Li;Yu, Zhiwu
混凝土碳化和重复荷载的耦合作用强烈影响钢筋混凝土（RC）结构的安全性并大大缩短使用寿命。开发了耦合碳化和重复加载下 RC 结构的新型腐蚀疲劳寿命预测模型。该方法考虑了疲劳损伤对混凝土碳化和碳化诱发腐蚀速率的影响，并考虑了钢筋腐蚀导致疲劳损伤累积的加速。以高速公路简支板桥中的6 m跨RC板为例，阐述了所提出的腐蚀疲劳寿命预测模型，讨论了交通频率、超载、碳化环境等级、环境温度和相对湿度对腐蚀疲劳寿命的影响。结果表明，该模型能够简单、方便地预测RC结构的腐蚀疲劳寿命。交通频率、超载、碳化环境等级、环境温度和相对湿度可使RC板的腐蚀疲劳寿命分别降低最多66.86%、58.90%、77.45%和44.95%。该研究有望为耦合碳化和重复加载下钢筋混凝土结构的腐蚀疲劳寿命预测提供框架。
The coupled action of concrete carbonation and repeated loading strongly influences the safety of reinforced concrete (RC) structures and substantially reduces service life. A novel corrosion-fatigue life prediction model for RC structures under coupled carbonation and repeated loading was developed. The effect of fatigue damage on concrete carbonation and carbonation-induced corrosion rate was considered, and the acceleration of fatigue damage accumulation due to reinforcement corrosion was considered in this approach. The proposed corrosion-fatigue life prediction model was illustrated by a 6 m-span RC slab in a simply supported slab bridge for the highway, and the effects of traffic frequency, overloading, carbonation environment grade, and environmental temperature and relative humidity on corrosion-fatigue life were discussed. The results indicate that the proposed model can predict the corrosion-fatigue life of RC structures simply and conveniently. Traffic frequency, overloading, carbonation environment grade, and environmental temperature and relative humidity can decrease the corrosion-fatigue life of the RC slab by up to 66.86%, 58.90%, 77.45%, and 44.95%, respectively. The research is expected to provide a framework for the corrosion-fatigue life prediction of RC structures under coupled carbonation and repeated loading.