硅酸盐通报2025，Vol.44Issue(9)：3196-3206,11.DOI:10.16552/j.cnki.issn1001-1625.2025.0257
基于DIC高温下混凝土断裂性能研究
Fracture Mechanical Properties of Concrete Exposed on High Temperatures Based on DIC
摘要
Abstract
Three-point bending fracture tests were conducted on notched concrete beams at different temperatures(20,200,400,600 and 800 ℃),and the surface deformation field was observed using the digital image correlation(DIC)method.By defining a strain boundary threshold,the fracture process zone of concrete was identified.Based on fracture mechanics theory,the initial fracture toughness,unstable fracture toughness and fracture energy of concrete were calculated.The variation law of fracture properties with temperature was analyzed.The results indicate that as temperature increases,the fracture process zone appears earlier,and the stable crack propagation phase is extended.The growth rate of the fracture damage factor accelerates with rising temperature during the early loading stages and gradually slows down near the peak load,suggesting that elevated temperatures cause the fracture process of concrete to transition from brittle to ductile.Both the initial and unstable fracture toughness decrease gradually with increasing temperature.The fracture energy gradually increases from 200 ℃ to 600 ℃ due to enhanced ductility and post-peak deformation capacity of concrete at high temperatures,but it significantly decreases at 800 ℃ as a result of material decomposition.关键词
混凝土/高温/断裂性能/断裂过程区/数字图像相关方法Key words
concrete/high temperature/fracture property/fracture process zone/digital image correlation method分类
建筑与水利引用本文复制引用
王磊,饶斌,赵燕茹,许有俊,陈明..基于DIC高温下混凝土断裂性能研究[J].硅酸盐通报,2025,44(9):3196-3206,11.基金项目
内蒙古自治区直属高校基本科研业务费项目(2024QNJS124,2024QNJS030) （2024QNJS124,2024QNJS030）
包头市青年人才创新项目(0701012401) （0701012401）
