Procedure for determining the thermoelastic state of a reinforced concrete bridge beam strengthened with methyl methacrylate

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

Temperature field of metal structures of transport facilities with a thin protective coating

“…The study of the temperature field in a three-layer model (defective ferroconcrete pipe reinforced with a metal corrugated structure) [20] has established the nonuniformity of temperature distribution across the layers, which leads to a contact effect defined by non-ideal conditions of heat exchange at the junction between the layers. Similar calculation outcomes of temperature fields have been achieved in the studies on multilayered bridge structures [21,22].…”

“…These papers mainly deal with the heating of the solid through the coating, with the issues of head conduction over the coating and exchange of heat with the solid and the ambient environment not being elaborated on. Papers [20][21][22] present temperature distributions in piecewise inhomogeneous solids and estimate their impact on the strength of structural elements. The study of the temperature field in a three-layer model (defective ferroconcrete pipe reinforced with a metal corrugated structure) [20] has established the nonuniformity of temperature distribution across the layers, which leads to a contact effect defined by non-ideal conditions of heat exchange at the junction between the layers.…”

Determining the residual service life of polymer-modified asphalt concrete pavement on road bridges

“…The issue of the use of polymeric materials is relevant to increase the bearing capacity of transport structures. In [16], the results of the assessment of the thermally-stressed state of reinforced concrete bridge beams restored by methyl methacrylate polymers are reported. As a result, it was found that the strength of the restored beams increases.…”

“…From the review of works [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] it follows that the assessment of the residual resource of asphalt pavement on reinforced concrete road bridges, taking into account the influence of temperature factors with the influence of time and the action of transport load, is a necessary and urgent task of scientific research. It is also necessary to devise a unified methodological basis for a comprehensive method for calculating the residual life of asphalt concrete pavement using SBR polymers on reinforced concrete road bridges, taking into account the joint effect of temperature (seasonal annual and daily temperatures) and vehicles.…”