ESTIMATION OF STEEL STRUCTURE CORROSION RISK LEVEL

摘要

The paper presents technical approaches and specifies procedures to ensure specified service life of steel structures through sustainable use of primary and secondary protection means and methods. Necessity of development of structure of controllable parameters of quality of structures and their coatings corrosion state on the basis of the process approach of the ISO 9001:2000 quality management system is shown. The problem of conformation of compliance of qualitative and quantitative indices of steel structure corrosion protection reliability to the level of building facility corrosion risk is formulated. Qualitative and quantitative criteria of technological safety, risk levels according to the alternative features including characteristics of vulnerability and threats in the course of steel structure use in corrosion environments are specified. The technique of determination of the primary and secondary protection reliability indices under the specified service life of steel structures is justified. The developed technical approach allows to estimate the steel structure availability factor by modeling the corrosion protection reliability indices. The table model of steel structure service life in corrosion environments when maintained according to an actual state is generated for the purpose of control of technological safety parameters in the course of structure use. The problem of modeling of availability factor under corrosive attack includes a design estimation of steel structure maintainability by the limiting states taking into account corrosion resistance and durability of steel structures and their coatings. Results of physicochemical and mathematical modeling of steel structure availability factor, maintainability indices comparative estimation for specification parameter justification by resource taking into account the intensity of corrosive attacks are presented. Algorithm of analysis of primary and secondary protection measure efficiency according to requirements of technological safety is developed. The levels of corrosion risk for interval values of availability index of steel structures in corrosive environment are specified. Use of corrosion risk criterion gives an opportunity to specify the requirements to the choice of primary and secondary protection measures accounting corrosiveness degree and the preset maintenance system.