钢绞线非均匀锈蚀下混凝土胀裂细观数值模拟  

Mesoscopic Numerical Simulation of Concrete Cracking Caused by Nonuniform Corrosion of Strands

作　　者：曾天宝 陈宏 黄筱淇 涂荣辉 戴理朝 ZENG Tianbao;CHEN Hong;HUANG Xiaoqi;TU Ronghui;DAI Lizhao(Nanchang Urban Planning&Design Institute Group Co.,Ltd,Nanchang,Jiangxi 330000,China;Zhejiang Traffic Engineering Management Center,Hangzhou,Zhejiang 310000,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]南昌市城市规划设计研究总院,江西南昌330000 [2]浙江省交通工程管理中心,浙江杭州310000 [3]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《中外公路》2024年第2期174-181,共8页Journal of China & Foreign Highway

基　　金：湖南省自然科学基金资助项目(编号:2020JJ1006);长沙理工大学双一流项目(编号:2019IC03)。

摘　　要：针对捻制构造钢绞线非均匀锈蚀引起的混凝土胀裂问题,该文建立钢绞线锈蚀产物非均匀膨胀模型和钢绞线非均匀锈蚀下混凝土胀裂细观数值模型。混凝土材料被模拟为由砂浆基质、骨料、界面层所组成的三相复合材料,并通过嵌入黏聚单元模拟由钢绞线非均匀锈蚀导致的混凝土胀裂行为。通过与已有试验对比验证所建模型的合理性,并分析混凝土保护层厚度与骨料含量对锈胀裂缝宽度的影响。结果表明:所建立的非均匀细观数值模型能够合理地模拟钢绞线非均匀锈蚀导致的混凝土胀裂全过程。考虑钢绞线非均匀锈蚀特征可以有效地提高锈胀裂缝预测精度。锈胀裂缝宽度随混凝土保护层厚度减小而增大,随混凝土中骨料含量增大而减小。The non-uniform corrosion of spinning strands will induce concrete cracking.A non-uniform expansion model of corrosion products of strands was established,and a mesoscopic numerical model of concrete cracking caused by non-uniform corrosion of strands was built.Concrete was considered as a threephase composite material composed of mortar matrix,aggregate,and interface layer.The concrete cracking behavior caused by the non-uniform corrosion of strands was simulated by embedding cohesive elements.The rationality of the proposed model was verified by existing experimental data,and the influence of protective layer thickness and aggregate content of concrete on the width of corrosion-induced cracks was discussed.The results show that the proposed non-uniform mesoscopic numerical model can reasonably simulate the whole process of concrete cracking caused by non-uniform corrosion of strands.Considering the non-uniform corrosion characteristics of the strand can effectively improve the prediction accuracy of corrosion-induced cracking.The width of corrosion-induced cracks increases with the decrease in the protective layer thickness of concrete and decreases with the increase in concrete aggregate content of concrete.

关 键 词：桥梁工程 钢绞线锈蚀 锈胀开裂 非均匀锈蚀 细观数值模型 

分 类 号：U447[建筑科学—桥梁与隧道工程]