Features of simplified calculations at surveys of construction structures existing buildings (problems of admissibility and validity)

The relevance of the discussed problem is shown. The recent researches and publications on the topic are analyzed. The tasks are developed for the specified goals achievement. For the most commonly used load-bearing structures the specific features of simplified calculations in the process of buildings and structures technical state inspection are considered. The civil structures simplified calculations are classified and systematized. The simplifications systematization and their admissibility justification are carried out, which promote the achievement of the calculations reliability and efficiency maximum level. The simplifications in the design schemes drawing up and existing loads and impacts determination, as well as the simplified calculations execution are analyzed. The area of simplified calculations admissibility is identified. The algorithm (stages) for civil structures simplified calculations is developed. Some example questions to a forensic expert are considered. The questions can be predicted and resolved based on the materials of this paper by means of the civil structures simplified calculations in the course of civil engineering forensic studies. Recommendations for further researches on the topic are provided. The study purpose is to substantiate the simplified calculations permissible range for the most commonly used load-bearing structures. The scientific novelty of the work is that for the first time the validity, admissibility and systematization problems of the load-bearing civil structures simplified calculations are considered. The study results are of practical importance for the construction engineering researches on the structures technical state assessment and forensics examinations.