In [39], an experiment was carried out comparing the operation of a strain gauge, an FOS, and the digital image correlation (DIC) method in monitoring the propagation of fatigue in concrete beams. In this experiment, an ODiSI 6108 system was used for the optical measurement of mechanical stresses and temperature distribution, a 3D DIC system, and five strain gauges from Hottinger-Baldwin-Mestechnik. According to the experiment results, the FOS and the DIC gave more detailed data on the stress distribution in the structure compared with strain gauges. At the same time, FOS provides a very efficient assessment of important parameters using a relatively small amount of data. A similar but more extensive study was carried out at the UCLouvain in Belgium [40], comparing the data obtained from distributed FOS installed inside a concrete structure to measure displacements and deformations of reinforcing bars with surface deformation data obtained using micrometers, linear differential transducers (LVDTs), and DIC systems. The ODiSI 6104 system was used as a distributed FOS. Empirical assumptions were used in which some parameters were overestimated or underestimated, while distributed FOS made it possible to measure the deformation penetration into blocks of concrete walls. The data were obtained with a higher resolution. At the same time, the software of the distributed FOS system imposes restrictions on the measurement of only 10-15% of deformations. The authors' works on using original design solutions in developing hardware and software complex mechanisms were considered [41]. The fundamental difference between the idea and analogs existing in the world is the development of a hardware-software complex capable of working with a single-mode OF [42] and analyzing the data obtained from changes in the pixels of a light spot incident on the surface of a television matrix. Using a single-mode optical fiber makes it possible to significantly increase the distance from the installation site of the FOS to the data processing unit. Preliminary studies have been carried out on using OF to control the integrity of concrete beams [43]. A single-mode optical fiber has a stepped profile, which is described by the Gaussian distribution, and the light spot contains a significant amount of noise, especially when the temperature changes, which complicates the measurement process [44]. Only intelligent processing of the received data with the help of a specialized hardware and software complex allows for solving the above problems. Previously, similar work was carried out on developing an FOS to control a monolithic array of mine workings and concrete support. In papers [45; 46], there is a description of the FOS and the hardware-software complex. These principles will be used later. The analysis shows that there is a problem of diagnosing the destruction of building structures, including monolithic ones, and the development of methods and means of effective control of this process, especially at an early stage, is required, especially when it is still impossible to detect cracks during visual inspection. The cost of fiber optics is relatively low, about 10 US dollars per 1 kmof length. Compared to a copper pair, this is a meager cost. In contrast to string sensors based on OF, it is possible to build a FOSM not only of a point type but of a distributed and a quasi-distributed type. Given the need to develop highly efficient means of remote monitoring load-bearing reinforced concrete structures, including columns, floor slabs and coatings, walls, flights of stairs, and foundations, experimental studies were conducted to solve the problems mentioned above. The basis of the monitoring system for monolithic reinforced concrete structures, including floors with pre-stressed beams, is a fiber-optic technology based on monitoring changes in the parameters of a light wave passing through an optical fiber under mechanical action on it. Optical fibers are very widely used in various fields of technology.