The article presents a comparative analysis of the results of verification calculations of a monolithic reinforced concrete floor slab and full-scale tests, and also formulates the main factors affecting the accuracy of determining the bearing capacity of monolithic reinforced concrete structures when performing verification calculations. In accordance with regulatory documentation, the bearing capacity of building structures is determined by performing verification calculations according to current design standards and conducting full-scale tests (if necessary) to confirm the bearing capacity established by the calculations. In modern practice of technical inspection, full-scale tests are extremely rare due to their high labor intensity and the complexity of interpreting the results. However, it is full-scale tests that allow the most accurate determination of the bearing capacity of a structure. This makes it possible to correctly assess the technical condition, optimize the development of strengthening projects due to a reasonable choice of method, accurate calculation of the required volumes of work and, as a result, minimize material costs.

Keywords: bearing capacity, full-scale tests, verification calculation, reinforced concrete, floor, deflection, limit state groups, technical inspection

The article presents an analysis of methods for strengthening reinforced concrete columns without changing the original design scheme. The calculation of reinforcement with a metal collar, a reinforced concrete collar, using prestressed struts and reinforcement with composite materials under central and eccentric compression is performed. A comparative analysis of the technical indicators of the considered reinforcement methods is made. A strategy for selecting a method for strengthening reinforced concrete columns is formed. An analysis of the optimal areas of application of various methods for strengthening reinforced concrete columns shows that the choice of a specific technology should be determined by the nature of their stress state depending on the magnitude of the eccentricity of load application. This study confirms that there is no universal "best" method for strengthening reinforced concrete columns; each of the considered methods has its own advantages and disadvantages. The results allow choosing optimal solutions based on the criteria of efficiency, reliability and cost-effectiveness.

Keywords: columns, reinforced concrete, steel, reinforcement, frame, carbon fiber, comparison, optimal method

The article presents a comparative analysis of the results obtained from the automatic determination of crack width in reinforced concrete structures using photogrammetric 3D targets and the manual method using a Brinell microscope. It also outlines the general conditions required to obtain accurate crack width measurements when performing photogrammetric surveys. The experience of using photogrammetric targets for determining crack width in reinforced concrete structures in Russia is limited due to the novelty of the method, the high cost of specialized equipment, and the complexity of data processing. Proper use of photogrammetric targets can significantly speed up the process of measuring crack width in monolithic reinforced concrete structures and improve measurement accuracy. This technology is particularly relevant for monitoring or field testing of structures that require regular crack width control.

Keywords: photogrammetric targets, monitoring, crack width, reinforced concrete, software suite, camera, focal length, lighting.