Abstract
The paper presents experimental results of the strain state evolution of the steel I-beam reinforced with composite material under four-point bending loading. Digital image correlation technique was used to trace the evolution of plastic strain zones distribution. The images of longitudinal relative strain on the lateral surface of the reinforced I-beam web were obtained and analyzed. It was found that the increase of load-bearing capacity of the reinforced beams can exceed 26 %.
Highlights
The given work presents experimental data on the strain distribution evolution on the surface of the I-beam web without reinforcement and with external reinforcement by carbon fiber under four-point bending.The real life environment can generate critical conditions for structural elements being exposed to external loads
This state of structural elements is characterized by plastic strain, which in case of emergency results in structural failure
The second stage – is a transition stage which is characterized by the beginning of elastoplastic straining
Summary
The real life environment can generate critical conditions for structural elements being exposed to external loads. This state of structural elements is characterized by plastic strain, which in case of emergency results in structural failure. The mechanisms leading to failure of both structural elements and the systems of external reinforcement are required to be specified. Digital image correlation technique provides the possibility to receive information in situ about deformation processes on the surface. When the mentioned technique is applied for investigation of strain impacts on the samples of various geometric shape it makes possible to reveal the common factors required for operation of structure under conditions of ultimate external loads
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