数字图像相关技术用于确定受火混凝土应变的可行性研究

Feasibility Study of Digital Image Correlation in Determining Strains in Concrete Exposed to Fire.

作者信息

Mróz Katarzyna, Tekieli Marcin, Hager Izabela

机构信息

Chair of Building Materials Engineering, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.

Chair for Computational Engineering, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.

出版信息

Materials (Basel). 2020 May 31;13(11):2516. doi: 10.3390/ma13112516.

DOI:10.3390/ma13112516

PMID:32486464

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7321450/

Abstract

Concrete is prone to spalling when exposed to fire. During fire tests, the strains of concrete elements are hard to identify, both from the fire-exposed face and the non-exposed face. This paper presents a field experiment which employed the original CivEng digital image correlation (DIC) method developed at the Cracow University of Technology to measure the strain fields of elements exposed to heating by a pin-point gas burner. The paper presents experimental proof that it is possible to analyze the deformation of both unheated and fire-exposed sides of heated concrete by the DIC method. The strain fields, crack patterns and modes of crack development are presented. The study shows the encouraging results of employing the DIC method to test concrete behavior under fire attack.

摘要

混凝土在火灾中容易发生剥落。在火灾试验中，很难从混凝土构件受火面和未受火面识别其应变。本文介绍了一项现场试验，该试验采用了克拉科夫理工大学开发的原始土木工程数字图像相关（DIC）方法，来测量由针点燃气燃烧器加热的构件的应变场。本文给出了实验证据，证明通过DIC方法可以分析受热混凝土未受热面和受火面的变形情况。文中给出了应变场、裂缝模式和裂缝发展方式。研究表明，采用DIC方法测试混凝土在火灾袭击下的性能取得了令人鼓舞的结果。