Introduction. The article presents a methodology for calculating thermal stresses in asphalt concrete road pavement on metal orthotropic highway bridges for durability. This methodology takes into account materials science and design approaches, which allows designing road pavement on metal highway bridges with increased crack resistance to the effects of annual and daily temperatures.
Issues. Highway bridges are an important component of the transport network not only of cities, but also of the entire state. Every year, thousands of new vehicles appear in Ukraine, which leads to a change in the composition of traffic flows, an increase in load capacity and speed. In most European countries, restrictions have been introduced on the movement of heavy vehicles on the bridge deck design in order to ensure a longer service life of the pavement and structural elements of bridges, because the road pavement on metal highway bridges operates in more adverse conditions and, accordingly, higher requirements are imposed on it than on non-rigid road surfaces of highways. The road surface on metal road bridges must be resistant to cracking from temperature fluctuations. In connection with the listed conditions, there is an urgent need to develop an improved calculation method that would meet modern road construction requirements, contribute to increasing the durability of the road surface on metal road bridges, and ensure the rational use of economic resources.
Purpose of the work. The modern development of road construction requires constant improvement of approaches to the design and calculation of road surfaces on metal road bridges, in particular, to determine more optimal rational design solutions for the bridge deck. Taking into account the latest research, modern materials and innovative technologies allows to increase the durability of asphalt concrete road surface on metal road bridges, reduce the risk of thermal cracks and optimize the costs of their repair and operational maintenance.
The purpose of the work is to inform road specialists about the latest trends, methods and developments in the field of designing asphalt concrete road surface on metal slabs of road bridges. The proposed methodology is aimed at increasing the efficiency of design solutions, adapting existing methods to modern operating conditions and ensuring economically justified use of material and technical resources.
Materials and methods. The study used a comprehensive approach based on the analysis of scientific and technical developments in the field of asphalt concrete road pavement design on metal road bridges, as well as practical experience in its arrangement. In particular, the results of research conducted by the National Transport University and Kharkiv Automobile and Road University, which are based on many years of experience in providing services in the field of road construction, were taken into account.
The methodological basis of the work is the analysis of current construction codes and national standards of Ukraine, as well as their comparison with relevant foreign regulatory documents and technical literature. To ensure the comprehensiveness of the study, domestic and international experience gained during the design and installation of asphalt concrete pavement on orthotropic highway bridges was taken into account.
Analytical and experimental methods were applied using the provisions of the theory of elasticity, the theory of viscoelasticity, the kinetic theory of the strength of solids, standardized and special methods for studying the properties of asphalt concrete. Analysis of the results allows us to substantiate improved approaches to the design and implementation of effective design solutions on the bridge deck of highway bridges.
Results. Within the framework of the study, this methodology was developed on the basis of scientific research, an analysis of technical literature and current regulatory documents on the use of asphalt concrete pavement on metal highway bridges. The methodology is based on experimentally established calculation parameters of waterproof materials, namely: mastic asphalt, goose asphalt, epoxy asphalt, cast asphalt, thermal resistance studies, as well as developed analytical dependencies for calculating the durability of asphalt concrete pavement from the position of temperature crack resistance.
Updated approaches to calculating the thermoelasticity of the road surface on a metal orthotropic slab of highway bridges are based on modern scientific research, international experience and practical data, which allows to increase the durability of the asphalt concrete pavement, reduce the risk of uncontrolled cracking and improve the operational characteristics of bridge deck structures.
Conclusions. The proposed method of thermal stresses in asphalt concrete road pavement on a metal orthotropic slab of highway bridges improves existing approaches to design the design of a bridge deck of increased durability is a continuous process of calculating the coating for strength and frost resistance with a feasibility study of options. It is based on modern research, takes into account the material science and design features of asphalt concrete road pavement, operating conditions and advanced world experience, which allows to increase the effectiveness of design solutions. The use of this method will contribute to improving the operational characteristics of road pavement structures on metal highway bridges, increasing their crack resistance, load resistance and durability. This, in turn, will reduce the risk of premature cracking, reduce the cost of repair and operational maintenance of the road pavement on metal highway bridges, and also ensure more rational use of material and technical resources in the field of road construction.
The introduction of a method for calculating thermal stresses in the design of a road bridge deck will contribute to improving the quality and durability of asphalt concrete pavement on metal highway bridges in Ukraine, which meets modern requirements for the development of road infrastructure and international standards.
