基于DIC高温下混凝土断裂性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0257

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (9): 3196-3206.DOI: 10.16552/j.cnki.issn1001-1625.2025.0257

基于DIC高温下混凝土断裂性能研究

王磊^1,2,3, 饶斌¹, 赵燕茹⁴, 许有俊^1,2,3, 陈明¹

1.内蒙古科技大学土木工程学院,包头 014010;
2.内蒙古科技大学内蒙古自治区高校城市地下工程研究中心,包头 014010;
3.内蒙古自治区土木工程安全与耐久重点实验室,包头 014010;
4.内蒙古工业大学土木工程学院,呼和浩特 010051

收稿日期:2025-03-10 修订日期:2025-05-12 出版日期:2025-09-15 发布日期:2025-09-19
通信作者: 赵燕茹,博士,教授。E-mail: zhaoyanru710523@126.com
作者简介:王磊(1989—),男,博士,讲师。主要从事混凝土高温力学性能研究。E-mail: 191722515@qq.com
基金资助:
内蒙古自治区直属高校基本科研业务费项目(2024QNJS124,2024QNJS030);包头市青年人才创新项目(0701012401)

Fracture Mechanical Properties of Concrete Exposed on High Temperatures Based on DIC

WANG Lei^1,2,3, RAO Bin¹, ZHAO Yanru⁴, XU Youjun^1,2,3, CHEN Ming¹

1. School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Science and Technology, Baotou 014010, China;
3. Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering, Baotou 014010, China;
4. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

Received:2025-03-10 Revised:2025-05-12 Published:2025-09-15 Online:2025-09-19

摘要/Abstract

摘要： 对不同温度(20、200、400、600、800 ℃)下混凝土切口梁进行三点弯曲断裂试验,借助数字图像相关(DIC)方法观测其表面变形场演化规律。通过定义应变边界阈值,识别混凝土断裂过程区。基于断裂力学理论计算混凝土起裂韧度、失稳韧度和断裂能,分析断裂性能随温度的变化规律。结果表明:DIC测得水平应变云图能较好地反映高温下混凝土断裂演化过程。随着温度升高,断裂过程区提前出现,裂缝稳定扩展阶段延长。断裂损伤因子的增长速率在加载初期随温度逐渐增加,在接近峰值荷载时逐渐下降,说明高温使混凝土断裂过程由脆性向延性转变。起裂和失稳韧度随温度升高逐渐降低。断裂能虽然在200~600 ℃时因高温下混凝土的延性与峰值后变形能力增加而逐渐增加,但是在800 ℃时因材料分解显著减少。

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

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.

Key words: concrete, high temperature, fracture property, fracture process zone, digital image correlation method

中图分类号:

TU528

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.

WANG Lei, RAO Bin, ZHAO Yanru, XU Youjun, CHEN Ming. Fracture Mechanical Properties of Concrete Exposed on High Temperatures Based on DIC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3196-3206.

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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

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