Measurement of strains and crack propagation by digital image correlation method in fire exposed concrete slab / Katarzyna Mróz, Marcin Tekieli, Izabela Hager // W: Proceedings of the International Conference ... więcej

Measurement of strains and crack propagation by digital image correlation method in fire exposed concrete slab / Katarzyna Mróz, Marcin Tekieli, Izabela Hager // W: Proceedings of the International Conference in Ljubljana, 10-11 June, 2021 : in edition of Applications of Structural Fire Engineering / eds. Robert Pečenko [et al.]. – Ljubljana : University of Ljubljana. Faculty of Civil and Geodetic Engineering, 2021. – (Applications of Structural Fire Engineering, ISSN 2570-8074). – S. 281-286 : fot., rys., tab., wykr. – Bibliogr. s. 286, Abstr. – ISBN 978-961-6884-71-6

The Digital Image Correlation (DIC) method is applied to track the strains of the unheated top surface of the concrete slab exposed to fire from the bottom. Having acquired the pictures of unheated surface ... więcej

The Digital Image Correlation (DIC) method is applied to track the strains of the unheated top surface of the concrete slab exposed to fire from the bottom. Having acquired the pictures of unheated surface throughout the entire fire test, the images are pre-processed and results are converted from pixel coordination system to object coordination system. The strain field is calculated and presented for each picture taken during the test. Therefore, the changes in strains can be easily tracked. The DIC method enables also us to see the time when the central part of the top surface works in tension or compression and what is the strain of each point of the surface under analysis at any specified time of test. During the test, the time of the creation of local micro-cracks that predict crack development can also be assessed. The paper presents the results acquired for tests on unloaded and loaded slabs.