Correlations of Damage to the Main Structures of Industrial Buildings from their Service Life

Introduction. Well-known studies on the research subject have failed to specify sample sizes and types of workshops based on their technological characteristics, which prevents us from summarizing the numerous damage data. The downside of the previous studies is the lack of generalizations with designing regression dependences of damage to the bearing elements of buildings on their service life. The subject of the study is the correlation of damage to the main structures of industrial buildings from their service life. In order to design these dependencies, a significant sample of workshops  (at least 100 workshops) has been investigated and the frequency of damage to their main structures has been examined. The frequency of damage has been previously studied and published by the authors. The aim of the study is to establish correlations between the degree of damage and the service life of structures.

Materials and Methods. The objects of the study were single-storey industrial buildings of the metallurgical, machine-building, energy industries, as well as production of building materials. The workshops were inspected by means of the standard methods endorsed in the national standards and norms. In order to analyze defects and damages, an electronic database was designed in a tabular processor that recorded all the basic information on types of workshops, materials and structures, defects and damages.

Research Results. The analysis of data on a large sample of industrial buildings made it possible to establish correlations between damage and the service life of structures. It was found that the rate of damage to steel columns is higher than that of reinforced concrete columns. The intensity of damage to steel columns is described by means of an exponential dependence, while that of reinforced concrete columns is a linear one. Brick and reinforced concrete walls are damaged linearly depending on the service life. The dependence "damage - service life" of reinforced concrete floors and coatings is approximated by a polynomial of the second degree, close to a linear relationship. Similar linear damage is typical of steel trusses. The damage rate of steel crane beams does not directly depend on the service life of the building itself, as the beams are replaced if damaged.

Discussion and Conclusion. As a result of the study of the frequency of damage, mathematical models of "damage - service life" of industrial building structures were obtained that can be used in order to optimize maintenance and repairs of buildings. The distinctive features of the accumulation of damages and defects over time for metal frames of industrial buildings associated with human mistakes are noted. In order to reduce accidents and optimize costs throughout the life cycle of buildings, it is suggested that a risk-based approach is applied, the likelihood of errors and cost of restoration measures at the stages of design, construction and operation are assessed.   

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