Scientific and categorial analysis of the concepts of restoration, damage, and temporal characteristics in the life cycle of civil structures

The subject of the study. Modern theories of managing the restoration of civil infrastructure demand a comprehensive rethinking of the categorical framework, which includes the concepts of «restoration,» «damage,» and «temporal characteristics of the life cycle.» In the context of increasing urban complexity, the rising frequency of extreme events, technogenic accidents, and wartime impacts, the justified application of these terms is a prerequisite for building adequate models for evaluating the condition of structures and planning their reconstruction strategies. Research methods. A scientific and categorial analysis makes it possible to delineate the application boundaries of each term, uncover the relationships between a structure’s physical condition and its functional potential, and construct an interpretative framework of damage considering temporal factors.This study systematizes approaches to damage classification based on depth, scale, propagation speed, and functional consequences, enabling the formation of adaptive typologies for response scenarios. Particular emphasis is placed on aligning terminology with normative and technical documentation and synchronizing it with modern digital models of life cycle management. A multilevel concept of damage interpretation is proposed—from technical defects to socio–functional disruptions. Critical temporal markers are defined to identify turning points between sustained functionality and the necessity for major intervention. The importance of accounting for the cumulative effect of damage and the role of systematic monitoring in determining acceptable degradation thresholds is highlighted. Research results. The findings of this study may serve as a foundation for developing integrated models for the restoration of civil facilities and establishing criteria for their prioritization within recovery programs.Conclusions. In this regard, it is essential to recognize that the concept of «restoration» is not univocal and acquires different nuances depending on the domain—technical, social, legal, or environmental. In the construction sector, it encompasses both minor repair interventions and full–scale reconstruction, repurposing, or even reintegration of the structure into a transformed urban landscape. Therefore, the categorical framework must be both flexible and standardized to ensure effective communication among all process participants—engineers, architects, clients, and government bodies.