Analysis of the stress-deformed state of the structure of road clothing depending on the location of the load relative to the edges of the combined slab

Abstract. Problem. Cement-concrete coatings are characterized by the complexity of repair work, therefore, for their repair or new construction, it is advisable to use asphalt-concrete coating. This constructive solution during the repair of cement concrete slabs helps to improve their technical and operational condition since the asphalt concrete layer performs the function of a protective or wearresistant layer on cement concrete slabs. The operating conditions of asphalt concrete layers on cement concrete slabs are significantly different from those typical for other structural solutions. The existing methods of calculating the strength of asphalt concrete coatings for hard road wear are not accurate enough, because they take into account only certain criteria of the strength of the asphalt concrete layer. The specifics of the stress-strain state of the asphalt concrete layer on cement concrete slabs under different load conditions, such as the middle of the slab, the edge of the slab, and the corner of the slab, are not taken into account. Given the complex stressstrain state of the asphalt concrete layer on a rigid base, the analysis of the stress-strain state is particularly relevant, aimed at determining the most dangerous variant of the location of the transport load to ensure the strength of the asphalt concrete layer. Goal. The purpose of this article is to determine the stress-deformed state of an asphalt concrete layer on a rigid base with various options for applying a transport load, which will allow the establishment of the most dangerous option for the location of the load. Methodology. General methods of solving problems of the mechanics of a deformed solid body were used to develop a calculation scheme and select a material model. Simulation of the stress-strain state of the road surface was carried out using the finite element method using the ANSYS software complex, investigating three options for placing the transport load: in the center of the slab, on its edge, and in the corner. Results. According to the results of the simulation of the stress-strain state of a combined slab made of an asphalt concrete layer on a rigid base, it was established that the edge of the slab is the most unsafe both in terms of tensile and shear stresses for a cement concrete slab. For the asphalt concrete layer, placing the load in the corner of the slab is the most dangerous both in terms of tangential shear stresses and Mises stresses. Originality. According to the results of the simulation of the stress-strain state of a combined slab made of an asphalt concrete layer on a rigid base, it was established that the edge of the slab is the most unsafe both in terms of tensile and shear stresses for a cement concrete slab. Practical value. Based on the results of modeling the stress-strain state of a combined slab made of an asphalt concrete layer on a rigid base, it was established that the edge of the slab is the most dangerous both in terms of tensile and shear stresses for a cement concrete slab. For the asphalt concrete layer, placing the load in the corner of the slab is the most dangerous both in terms of tangential shear stresses and Mises stresses