APPLICATION OF DIC METHOD FOR DETERMINING STRESS-STRAIN STATE OF FLEXIBLE REINFORCED CONCRETE SLABS
DOI:
https://doi.org/10.31650/2786-6696-2026-16-29-39Keywords:
reinforced concrete slab, DIC method, digital image correlation, stress-strain state, experimental research, deflections, strains crack formation.Abstract
The article is devoted to the application of the Digital Image Correlation DIC method for experimental determination of the stress-strain state of reinforced concrete slabs. Assessment of the bearing capacity and deformability of reinforced concrete structures is an important task in the design and operation of buildings and structures especially when strengthening existing structures is necessary. Traditional strain measurement methods using strain gauges and deflectometers provide point measurements which do not allow obtaining a complete picture of strain distribution over the entire surface of an element.
The aim of the research was experimental determination of the stress-strain state of reinforced concrete slabs using the DIC method to assess their behavior before strengthening. A control specimen of a reinforced concrete slab with dimensions 2000×590×50 mm was manufactured from C30/40 concrete with 6Ø8 A500C reinforcement reinforcement ratio ρ=1.65%. Holes with diameter 110 mm were made in the slab for future beam strengthening. A speckle pattern was applied to the end surface for DIC tracking.
The tests were carried out on a UTEST hydraulic press according to a four-point bending scheme with working span L=1900 mm. A stereo DIC system with two digital cameras and Vic-3D software was used to record strains. Data from the DIC system were synchronized with load indicators.
Complete load-deflection and load-strain diagrams were obtained. Characteristic points crack formation at P=2.4 kN f=14 mm yielding at P=8.6 kN f=66 mm ε=2.5‰ maximum P=9.81 kN at f=114 mm. Maximum tensile reinforcement straиi ns reached 9.85‰ which is 4 times higher than the yield limit. The DIC method provided visualization of strain fields and accurate recording of crack formation.
The research results confirmed the high efficiency of the DIC method for comprehensive assessment of the stress-strain state of reinforced concrete slabs. The obtained experimental data will serve as a basis for comparison with the results of testing strengthened slabs.
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