Consideration of defects and damages of reinforced concrete structures in verification calculations

Introduction. To determine the category of technical condition of building structures and the building as a whole, building codes require the assessment of the actual load-bearing capacity and serviceability of structures based on verification calculations, which must take into account the damage and defects of structures identified during the inspection of the technical condition of the object: changes in the geometric dimensions of the cross-section of structures, actual strength characteristics of reinforced concrete structure materials and their reinforcement, acting loads, as well as refined calculation schemes created taking into account the identified damage and defects of structures. Defects and damage to load-bearing structures are modelled in the information calculation model of the object created at the design stage of the object.

Materials and methods. The paper provides examples of modelling in the LIRA software of defects associated with violations of the technology of construction of objects, the sequence of construction of a flat calculation model as a fragment of the information calculation model of the object, created for the initial assessment of the influence of defects and damages on the stress-strain state of the surveyed structure.

Results. The literature review presented in the paper showed the existence of private methods of computer modelling of defects and damages of reinforced concrete structures, but at the same time revealed the incompleteness of regulatory recommendations for computer modelling of defects and damages. The paper emphasizes that for the assessment of the detected defects and damages, as well as for classifying structures with defects and damages into categories of technical condition, especially into the category of emergency condition, an important point is the availability of a classification of these defects and damages.

Conclusions. It was concluded that although such a classification exists in the latest updated version of GOST 31937–2024, it also requires significant additions and clarifications. The examples show that at the initial stage of verification calculations it is sufficient to use small flat models, the calculation results of which should be taken into account when correcting the information calculation model of the surveyed object. This will significantly simplify the approach to modelling structures with defects and damages while maintaining sufficient accuracy of the results of assessing the technical condition of structures.

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