海工混凝土中严重锈蚀钢筋的非均匀锈蚀特性与力学性能研究  

Non-uniform corrosion characteristics and mechanical propertiesof serious corroded reinforcement in marine concrete

作　　者：杨帅 应宗权[1,2,3] 李嘉民 刘梅梅 赵娟[1,2,3] YANG Shuai;YING Zongquan;LI Jiamin;LIU Meimei;ZHAO Juan(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;Key Laboratory of Hydraulic Structure Durability Technology for Transportation Industry,Guangzhou 510230,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China)

机构地区：[1]中交四航工程研究院有限公司,广东广州510230 [2]水工构造物耐久性技术交通运输行业重点实验室,广东广州510230 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519082

出　　处：《水运工程》2024年第12期45-50,62,共7页Port & Waterway Engineering

摘　　要：以服役35年高桩码头原型构件中的锈蚀钢筋为研究对象,采用3D扫描获得钢筋的非均匀锈蚀特征,通过拉伸试验研究钢筋的锈蚀率对力学性能退化的影响。通过分析和回归试验数据,建立锈蚀钢筋质量损失率与最大截面损失率关系式,获得海工混凝土构件锈蚀钢筋名义屈服强度、名义极限强度等力学性能特征值的回归公式,并与现有公式进行对比。结果表明,随着钢筋锈蚀程度的增加,锈蚀的不均匀性加剧,相同质量损失率的钢筋所对应最大截面损失率相应增大;同时,钢筋的名义屈服强度、名义极限强度和极限应变等参数均发生不同程度的退化,且屈服平台逐渐消失;所提出的回归公式能更准确地表述海工混凝土结构中的锈蚀钢筋的力学性能的退化规律。Taking the corroded reinforcement in memeber of the 35-year high pile wharf prototype as an research object,we obtain the non-uniform corrosion characteristics of reinforcement by 3D scanning,and study the effect of corrosion rate on mechanical properties degradation by tensile test.Base on the analysis and regression test data,we build a formula for calculating the relationship between the mass loss rate of corroded reinforcement and the maximum section loss rate,obtain the regression formulas for the mechanical properties of corroded reinforcement in offshore concrete members,such as nominal yield strength and nominal ultimate strength,and compare with existing formulas.The results show that with the increase of steel corrosion degree,the non-uniformity of corrosion is intensified,and the maximum section loss rate of reinforcement with the same mass loss rate increases correspondingly.At the same time,parameters such as nominal yield strength,nominal ultimate strength and ultimate strain degrade to varying degrees,and the yield platform disappears gradually.The proposed regression formula can more accurately describe the degradation law of mechanical properties of corroded reinforcement in marine concrete structures.

关 键 词：非均匀锈蚀 钢筋 力学性能 在役结构 

分 类 号：U654[交通运输工程—港口、海岸及近海工程]