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[108710] Artykuł: Analysis of Crack Width Development in Reinforced Concrete BeamsCzasopismo: Materials Tom: 14, Zeszyt: 11, Strony: 1-25ISSN: 1996-1944 Opublikowano: Czerwiec 2021 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 140 Pełny tekst DOI Keywords: reinforced concrete  crack initiation and development  monotonic and cyclic load  simple  description of crack width  crack width calculation  digital image correlation  |
The reliability and durability of reinforced concrete structures depend on the amount
of concrete cracking. The risk associated with cracks generates a need for diagnostic methods
for the evaluation of reinforced concrete structures. This paper presents the results of a study of
10 single-span reinforced concrete beams to follow the process of crack formation and changes in
their width. The beams were loaded to failure with two forces in a monotonic manner with unloading
and in a cyclic manner. Continuous observation of the crack formation process was provided by
the digital image correlation system. The simplified method for estimating the maximum crack
width is proposed. The presented results confirmed the stochastic character of the process of crack
formation and development. The maximum crack widths calculated on the basis of the proposed
formula were on the safe side in relation to those calculated according to Eurocode 2. It was also
confirmed that the distances between cracks do not depend on the loading manner. Hence the
density function describing the distribution of distances between cracks can be used to assess the
condition of reinforced concrete elements. The research has also shown the suitability of the DIC
system (ARAMIS) for testing concrete elements.