水资源与水工程学报2024，Vol.35Issue(4)：136-143,152,9.DOI:10.11705/j.issn.1672-643X.2024.04.16
基于损伤模型的混凝土冻融循环过程数值模拟研究
Numerical simulation of freeze-thaw cycling process of concrete based on damage model
摘要
Abstract
Freezing and thawing damage is one of the main damage modes of concrete in cold regions,and the process of freezing and thawing is a gradual destruction and evolution process of concrete materi-als.A hydrothermal damage coupling model of concrete was established based on the concrete damage theory.This model can simulate water phase change and pore water pressure variation in the process of freezing and thawing of concrete,and reflect the actual damage process by the index of cumulative dam-age.According to the comparison with available experimental data in the literature,the accuracy of this model was verified.Meanwhile,the influence of the center minimum temperature,cooling rate and initial porosity on the freeze-thaw damage of concrete were also investigated.The results show that the cumula-tive damage of concrete gradually increases with the decrease of the minimum temperature at the center of the specimen,and the increase of the cooling rate and the initial porosity.Although the damage zone gradually develops inward from the perimeter of the specimen,the maximum damage zone and cracks ap-pear inside the specimens near the prismatic corners and expands to the outside when the cooling rate and initial porosity are overly large.This result explains the phenomenon that the corners are the first to fall off after freeze-thaw damage of prismatic specimens.关键词
混凝土/冻融循环/水热力耦合模型/损伤/有限元模拟Key words
concrete/freeze-thaw cycle/hydrothermal coupling model/damage/finite element simu-lation分类
建筑与水利引用本文复制引用
孟智田,李宗利..基于损伤模型的混凝土冻融循环过程数值模拟研究[J].水资源与水工程学报,2024,35(4):136-143,152,9.基金项目
国家重点研发计划项目(2017YFC0405101) （2017YFC0405101）
