基于弹性力学理论的钢筋混凝土结构保护层锈胀开裂时间预测模型研究  

Research on Prediction Model for Time of Corrosion-Induced Cover Cracking in RC Structures Based on Theory of Elastic Mechanics

作　　者：李永平 刘慧源 赵哲 邵伟 李相利 丁民涛 LI Yongping;LIU Huiyuan;ZHAO Zhe;SHAO Wei;LI Xiangli;DING Mintao(Inner Mongolia Electric Power Survey&Design Institute Co.LTD.,Hohhot,Inner Mongolia 010020,China;Inner Mongolia Power(Group)Co.LTD.,Hohhot,Inner Mongolia 010010,China;College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;Inner Mongolia Power(Group)Co.,LTD.,Ordos Electric Power Bureau,Ordos,Inner Mongolia 017010,China;China Electric Power Research Institute,Beijing 100055,China)

机构地区：[1]内蒙古电力勘测设计院有限责任公司,呼和浩特010020 [2]内蒙古电力(集团)有限责任公司,呼和浩特010010 [3]上海海事大学,海洋科学与工程学院,上海201306 [4]内蒙古电力(集团)有限责任公司鄂尔多斯电业局,鄂尔多斯017010 [5]中国电力科学研究院有限公司,北京100055

出　　处：《结构工程师》2022年第5期8-14,共7页Structural Engineers

基　　金：国家自然科学基金资助项目(52078289)。

摘　　要：基于弹性力学理论与钢筋锈胀机理,推导了钢筋混凝土保护层锈胀开裂时的钢筋临界锈蚀量。基于Faraday定律,建立了钢筋混凝土保护层锈胀开裂时间预测模型。通过将模型预测的保护层锈胀开裂时间与试验结果进行对比,对所建立预测模型进行了验证。在此基础上,对影响混凝土保护层锈胀开裂时间的相关因素进行了分析。分析结果表明:随着保护层厚度与混凝土弹性模量的增大,混凝土保护层锈胀开裂时间逐渐增大;而随着锈蚀产物体积膨胀率、钢筋锈蚀速率和混凝土抗拉强度的增大,混凝土保护层锈胀开裂时间逐渐减小。Based on the theory of elastic mechanics and corrosion mechanism of reinforcing steel,the critical corrosion amount of reinforcing steel for cracking of concrete cover was derived. Based on Faraday’s law,an analytical model for time to corrosion-induced cover cracking in reinforced concrete structures was established.The proposed analytical model was verified by comparing the analytical predictions with the experimental results. The main factors affecting the time to corrosion-induced cracking were analyzed. The analytical results show that the time to corrosion-induced cracking increases gradually with the increase of thickness of concrete cover thickness and elastic modulus. The time to corrosion-induced cracking decreases gradually with the increase in the volume expansion ratio of corrosion products,corrosion rate and tensile strength of concrete.

关 键 词：钢筋混凝土保护层 钢筋锈蚀 锈胀开裂时间 预测模型 

分 类 号：TU375[建筑科学—结构工程]