Article

Received 31.08.2021

Revised 04.01.2022

Accepted 15.02.2022

Retrieved from Vol. 26, No. 1, 2022

Pages 423 -429

Shevchuk, L. (2022). Thermoelastic deformations of an asphalt concrete layer on a metal bridge slab with a change in asphalt concrete thickness. The National Transport University Bulletin, 26(1), 423-429. https://doi.org/10.33744/2308-6645-2022-1-51-423-429

Thermoelastic deformations of an asphalt concrete layer on a metal bridge slab with a change in asphalt concrete thickness

Lyudmila Shevchuk

Based on the theory of thermoelasticity, the problem of the thermally stressed state of a two-layer fragment of a bridge structure, consisting of a metal base and an asphalt concrete upper layer, is considered under conditions of changing ambient temperature at different values of the asphalt concrete thickness. It is believed that the materials of the layers are characterized by different thermomechanical parameters, which determine the inhomogeneity of the stress and strain fields. It has been established by computer modeling that these factors lead to the concentration of stresses and strains and a change in the stress-strain state of the bridge structure of the driving deck, which is not taken into account in modern practice of designing and operating bridges, and is one of the causes of premature destruction of the asphalt concrete pavement of the road bridge. To eliminate these shortcomings, on the basis of finite element algorithms, a theoretical analysis of the thermally stressed state of a metal orthotropic slab with an asphalt concrete pavement was performed at different ratios of their thicknesses. It is shown that a decrease in the thickness of the upper layer can lead to an increase in the contact and normal tensile stresses initiated in it. Therefore, when designing bridge structures, these features should be taken into account additionally.

 

bridge structure; asphalt-concrete coating; orthotropic plate; tracked tracks; transport loads; stress field; thermo elastic state
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https://doi.org/10.33744/2308-6645-2022-1-51-423-429