基于Monte-Carlo法的锈蚀钢筋混凝土构件截面钢筋锈蚀率研究  

Comprehensive corrosion rate at cross-section of corroded reinforced concrete member by Monte-Carlo method

作　　者：李嘉民 应宗权[1] 梁梓豪 刘梅梅[1] 赵娟[1] LI Jiamin;YING Zongquan;LIANG Zihao;LIU Meimei;ZHAO Juan(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Key Laboratory of Harbor&Marine Structure Durability Technology,Ministry of Transport,Key Laboratory of Construction Material,CCCC,Guangzhou 510230,China)

机构地区：[1]中交四航工程研究院有限公司,水工构造物耐久性技术交通运输行业重点实验室,中交集团建筑材料重点实验室,广东广州510230

出　　处：《水运工程》2025年第1期29-36,共8页Port & Waterway Engineering

基　　金：国家重点研发计划项目(2022YFB2603000)。

摘　　要：从原型构件和加速腐蚀构件中获取不同锈蚀程度的钢筋试件,借助三维激光扫描技术计算得到各锈蚀钢筋试件的残余截面积数据,并对其进行统计分析;通过Monte-Carlo抽样算法,研究构件截面钢筋锈蚀率与构件整体钢筋锈蚀率、配筋数量的关系,并对比分析这两种构件锈蚀率指标在锈蚀钢筋混凝土梁承载力评估中的性能特点。结果表明,广义极值分布模型对锈蚀钢筋残余截面积概率分布拟合效果最佳;构件截面钢筋锈蚀率与构件整体钢筋锈蚀率之比α随构件整体钢筋锈蚀率的增大和配筋数量的增加而减小;构件截面钢筋锈蚀率能更准确地预测锈蚀钢筋混凝土梁剩余承载力。We obtain varying degrees of corroded reinforcement specimens from prototype and accelerated corrosion members.Using 3D laser scanning,we caculate and statistically analyze the residual cross-sectional areas of each corroded reinforcement specimen.We study the relationship among the comprehensive corrosion rate at the cross-section of corroded reinforced concrete and the overall corrosion rate of corroded reinforced concrete,as well as the number of reinforcements using Monte-Carlo sampling algorithm,and carry out a comparative analysis of the performance characteristics of these two corrosion rate indicators in the assessment of the bearing capacity of corroded reinforced concrete beams.The results show that the generalized extreme value distribution model provide the best fit for the probability distribution of residual cross-sectional areas of corroded reinforcement.The ratioαof the comprehensive corrosion rate at the cross-section and the overall corrosion rate of corroded reinforced concrete decreases as the overall corrosion rate of corroded reinforced concrete and the number of reinforcements increase.On the basis of the comprehensive corrosion rate at the cross-section,the residual bearing capacity of corroded reinforced concrete beam can be predicted more accurately.

关 键 词：锈蚀钢筋混凝土 统计分析 广义极值 承载力评估 

分 类 号：U654[交通运输工程—港口、海岸及近海工程]