The study examines the regularities of the outer coatings deterioration of ice class vessels and icebreakers, as well as the effect of ice-resistant protective coatings on deterioration rates. As the initial data, the results of measurements of residual thicknesses from the DEFHULL computer database were used. A comparison of the normative values of the outer coatings deterioration rates for ice class vessels presented in the current version of the RMRS Rules and the values obtained as a result of processing the DEFHULL database data was carried out. The results and conclusions were used in developing the proposals for amending and supplementing the RMRS Rules regarding the purpose of corrosion and abrasion surcharges when determining the thickness of the outer coatings of ice class vessels.

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Purpose: To perform working efficiency analysis of catenary separately standing reinforced-concrete supports in high-speed railway conditions, to develop measures and constructive solutions of the supports of increased reliability and durability. Methods: Analysis of typical constructive solutions according to Russia State Standard GOST 19330-99 given their exploitation experience, the use of numerical calculation methods involving calculation programs. Results: The disadvantages of being applied structures of catenary supports on railways with the use of steel and reinforced concrete are analyzed. The calculations of typical reinforced-concrete support bearing capacity and rigidity according to GOST 19330-99 with the use of SCAD computing complex for the effect of vital climatic and exploitational burdens, including ones from wind pressure at high-speed rolling stock motion trains at the speed of 300 km/h, are made. Innovative support construction has been developed which includes pillar of reinforced concrete, fiber-reinforced concrete or steel on reinforced-concrete foundation, the construction is combined with alignment-free mounting method to ensure the impermeability of construction being united parts. Practical significance: The reserves for working efficiency of typical separately-standing reinforced-concrete catenary supports in the conditions of high–speed railway trunk St. Petersburg - Moscow on project documentation basis are revealed. The possibility of pressure perception by supports from wind flow at train motion of 300 km/h speed has been established. The application of innovative combined steel-concrete structure of catenary support construction and its mounting ways are proposed. The use of support mounting and construction new way would allow to reduce support mounting laboriousness as well as to rise support reliability and durability in exploitation changing conditions.

Purpose: To pursue the analysis of hybrid and combined frame possible usage for overlaps of buildings and structures for civil and industrial purposes, including on transport, to expand beam structure nomenclature, to develop innovative structural solution of hybrid beam with material low consumption but with frame increased reliability and durability. Methods: Analysis of the advantages of known hybrid frames, of materials, used for their projection; metal composite beam calculation using existing engineering techniques in accordance with STO 38276489.003-2017 “Strengthening of steel structures with composite materials. Projection and techniques of work production” and numerical calculation methods involving calculation software programs. Results: New workouts for beams with the use of steel concrete and composite materials for projected and strengthened structures are presented. Innovative frame of metal composite beam has been developed — steel beam strengthened with external reinforcement system of composite material, protected by a useful model patent, its static and structural calculation has been performed using SCAD computing complex; stress-strain state has been analyzed, the analysis of steel consumption reduction for a metal composite beam and of its other advantages in comparison with steel and reinforced concrete beam traditional solutions has been carried out. Practical significance: The advantages of hybrid and combined structures are revealed, the decrease in material capacity for a metal composite beam strengthened by boroplastics in comparison with a steel one is revealed. The proposed structural solution of a beam can be used in overlaps and coverings for buildings and structures, transport buildings, especially, in aggressive environment conditions as well as during major repairs and reconstruction of industrial and civil purpose facilities.