Building objects experience various kinds of impacts that can cause deformations of structural elements - deflections, integrity violations, complete destruction of individual elements, etc. Timely detection of deformations and monitoring of their dynamics is the most important element of the safe operation of buildings and structures. The task of monitoring cracks in building structures is to record changes in cracks in order to monitor their technical condition. As a result of monitoring, decisions are made on the further operation of the facility, the need for repair measures, and the elimination of factors affecting the development of cracks. The use of beacons makes it possible to monitor the behavior of deformations of building structures. For the simplest observations, gypsum and point beacons can be used, for more detailed observations, clock-type beacons and plate beacons can be used. Electronic beacons enable detailed automated monitoring of changes.

Keywords: crack, beacon, gypsum beacon, lamellar beacon, sentry beacon, point beacon, crack opening width