THMC多场耦合作用下的钢筋混凝土单元性能研究
Study on the Performance of Reinforced Concrete Units under the Multi-field Coupling of THMC
于水 1吴平一 1魏家帅1
作者信息
- 1. 沈阳建筑大学市政与环境工程学院,沈阳 110168
- 折叠
摘要
为了探究钢筋混凝土单元内热湿和裂缝生成的相互关系,考虑热-湿-力-化学(Thermo-Hydro-Mechanic-Chemical,THMC)多场耦合的影响.将三元电流场、温湿度场、固体力学相结合,建立4个物理场相互耦合的本构模型,采用COMSOL内置求解器对方程进行求解,并模拟10 a内含裂缝围护结构的热湿动态性能.结果表明:钢筋的氧化腐蚀会导致裂缝,经腐蚀膨胀应力导致的裂缝在3～4a后会极大的破坏围护结构的热工性能.初始年份,受损墙体传出的热通量是未受损墙体的4倍,而在第7年向内传递的湿通量为4.78×10-8 kg/(m2·s),是未受损墙体的2倍,这说明对建筑采取阴极保护措施的重要性.
Abstract
In order to explore the relationship between heat and moisture and crack formation in reinforced concrete elements,the influence of Thermo-Hydro-Mechanic-Chemical multi-field coupling was considered.The constitutive model of four physical fields was established by combining the ternary current field,temperature and humidity field,and solid mechanics.The equation was solved by COMSOL built-in solver,and the thermal and dynamic hygrothermal performance of the crack-containing enclosure was simulated over 10 years.The results show that the oxidation corrosion of the steel bar will lead to cracks,and the cracks caused by corrosion expansion stress will greatly damage the thermal performance after 3～4 years.In the initial year,the heat flux from the damaged wall was 4 times that of the undamaged wall,and in the seventh year,the moisture flux transferred inward was 4.78x 10-8 kg/(m2·s),twice that of the undamaged wall,indicating the importance of taking cathodic protection measures for buildings.
关键词
多场耦合/裂缝/钢筋混凝土单元/本构模型/热湿传递Key words
multi-field coupling/cracks/reinforced concrete unit/constitutive model/heat-moisture transfer引用本文复制引用
基金项目
国家自然科学基金项目(52078308)
辽宁省"兴辽英才计划"项目(XLYC2007003)
辽宁省教育厅项目(lnzd202003)
出版年
2024
NETL
NSTL
万方数据