Abstract
This paper reports the analysis of methods for determining temperature stresses and deformations in bridge structures under the influence of climatic temperature changes in the environment. A one-dimensional model has been applied to determine the temperature field and thermoelastic state in order to practically estimate the temperature fields and stresses of strengthened beams taking into consideration temperature changes in the environment. The temperature field distribution has been determined in the vertical direction of a reinforced concrete beam depending on the thickness of the structural reinforcement with methyl methacrylate. It was established that there is a change in the temperature gradient in a contact between the reinforced concrete beam and reinforcement. The distribution of temperature stresses in the vertical direction of a strengthened reinforced concrete beam has been defined, taking into consideration the thickness of the reinforcement with methyl methacrylate and the value of its elasticity module. It was established that the thickness of the reinforcement does not have a significant impact on increasing stresses while increasing the elasticity module of the structural reinforcement leads to an increase in temperature stresses. The difference in the derived stress values for a beam with methyl methacrylate reinforcement with a thickness of 10 mm and 20 mm, at elasticity module E=15,000 MPa, is up to 3 % at positive and negative temperatures. It has been found that there is a change in the nature of the distribution of temperature stresses across the height of the beam at the contact surface of the reinforced concrete beam and methyl methacrylate reinforcement. The value of temperature stresses in the beam with methyl methacrylate reinforcement and exposed to the positive and negative ambient temperatures increases by three times. It was established that the value of temperature stresses is affected by a difference in the temperature of the reinforced concrete beam and reinforcement, as well as the physical and mechanical parameters of the investigated structural materials of the beam and the structural reinforcement with methyl methacrylate
Highlights
According to data from [1], examination of the technical condition of bridges in Ukraine in 2020 found that 895 artificial structures across the country need immediate repair
At the positive and negative temperature changes of the environment, the temperature of methyl methacrylate reinforcement is, respectively, +20 °C and –15 °C; reinforced concrete beam, +30 °C and –10 °C; in the contact between the reinforced concrete beam and methyl methacrylate reinforcement, there is a change in the temperature gradient
The data acquired from our numerical studies make it possible to model the temperature field and stresses in a strengthened reinforced concrete beam, taking into consideration the physical-mechanical parameters of the material for methyl methacrylate reinforcement and beams, as well as ambient temperature
Summary
According to data from [1], examination of the technical condition of bridges in Ukraine in 2020 found that 895 artificial structures across the country need immediate repair. It should be noted that ensuring the trouble-free operation of bridges in developed countries is a relevant. Recall the collapse of a four-lane road bridge in Italy in 2018. The application of promising technologies for repairing defective bridges is an urgent task for bridge engineering. To improve the bearing capacity of road bridges, a method for strengthening beams with methyl methacrylate compositions (hereinafter, methyl methacrylate) has been used in recent years.
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