Ways of developing assessments of the technical condition of buildings and structures

Abstract

The main differences between the norms for assessing the technical condition of buildings and structures and the norms for their design are analyzed, which are due to different levels of awareness and the degree of uncertainty of the parameters of the structure. It is indicated that the current standards of structural design are not sufficient for assessing the reliability of existing structures, for designing their repair or modernization. Existing design standards do not provide for procedures for assessing the current state of existing structures and the resistance of materials. In addition, they do not deal with the uncertainty of the situation, which is fundamentally different from the design conditions when it comes to the existing structure. During the design of a new structure, the uncertainty of the parameters is taken according to the data averaged for the entire country. But the implemented design is not the average across the country, but is a specific unique structure with characteristics that are refined and, therefore, uncertainties are reduced. It is proposed to take into account the level of knowledge about the technical condition assessment object by using special uncertainty coefficients. The possibility of applying reduced values of target levels of reliability, the values of which are substantiated by calculations based on the quality of life index, is emphasized. The recommendations of the international standard ISO 13822, regarding the possibility of reducing the target reliability index, were compared with calculations based on the quality of life index LQI, based on Ukrainian statistics. It is considered appropriate to use new risk-oriented approaches in order to improve the decision-making system for planning the life cycle of construction structures and assessing the residual resource. A list of tasks that need to be solved for this is provided.