Abstract
The study suggests a method for determining the characteristic and desired values of corrosion resistance indicators to estimate the reliability parameters of systems of anticorrosive protection of structures (SAPS). The approach is based on developing robust (resistant to external influences) systems for designing measures of primary and secondary protection of metal structures against corrosion. Technological methods of diagnostics and maintenance are substantiated to improve the ways of using the constructions at all stages of their life cycle. Stronger corrosion resistance, that is, resistance to aggressive operating environments, is provided by effective methods of primary and secondary protection of metal structures from corrosion. The design is aimed at developing the provisions of the current standards of EN 1990 on the SAPS. It is established that the proposed requirements are aimed at ensuring the quality of metal structures and are achieved through calculations by the method of limit state design (LSD) using reliability coefficients (EN 1991). Robustness and durability are ensured in accordance with the provisions of EN 1993. The characteristic values of the quality indicators of protective coatings (EN ISO 12944, EN 1461) and structural material (EN 1993-1-4) are used. However, the procedures mean that such operating conditions are limited as for estimating the durability. The proposed technique will improve the measures for anticorrosive protection of structures based on the robust design. The implementation of the method justifies the design and technological preparation of work to extend the durability of the structures. Effective procedures of primary and secondary protection have been introduced, and the requirements of the ISO 9001 international standards have been implemented
Highlights
Efforts to ensure durability of metal structures are associated with substantiating the requirements for corrosion resistance at the stage of design work
It is essential to establish a methodological approach to assessing the corrosion protection of metal structures, which is stipulated by the standards of EN 1990, EN 1991, and EN 1993 in accordance with the reliability requirements
A procedure has been developed for designing the systems of anticorrosive protection of structures (SAPS) in corrosive environments
Summary
Efforts to ensure durability of metal structures are associated with substantiating the requirements for corrosion resistance at the stage of design work. In the provisions of EN 1993, the design procedure for durable structures is carried out using the characteristic values of the properties of the coatings (EN ISO 12944 and EN 1461). The procedure entails limitations in assessing the actual technical state of the structures as well as analysing the environmental parameters, characteristics and conditions of the technological process for estimating durability during wear. It is essential to establish a methodological approach to assessing the corrosion protection of metal structures, which is stipulated by the standards of EN 1990, EN 1991, and EN 1993 in accordance with the reliability requirements. The presence of deterioration processes caused by the material aging, corrosion or endurance degradation is supposed to be taken into account through the reasonable choice of materials for metal structures and their protective anti-corrosion coatings in accordance with the provisions of EN 1993-1-4 and EN 1993-1-10. It should be noted that the described procedure for assessing the reliability of structures (EN 1990 and EN 1991) is implemented, for example, when establishing the rules for determining the fire resistance of steel structures in EN 1993-1-2
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