PSI - Issue 32

G. Gusev et al. / Procedia Structural Integrity 32 (2021) 49–55

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Gusev G.N./ StructuralIntegrity Procedia 00 (2019) 000 – 000

These complex structures built in unique engineering and geological conditions. These structures are affected by highly aggressive environments, caused by precipitation, potassium salts and temperature extremes. Structures affected by significant static and dynamic loads under these conditions. All of these factors that can lead to the destruction of the bearing structures of the construction and entail human casualties. Thus, the most urgent task is scientific and technical support for the construction of these complex engineering structures that are built and operated in aggressive environments. Continuous diagnostics and assessment of the stress-strain state of supporting structures are necessary at all stages of the life of these objects. This work is devoted to the analysis of the design, installation and use of strain gauges in highly aggressive environments of potassium salts. The strain gauge system is a part of an integrated automated system for monitoringthedeformation of a complex building structure. This structure is a special (industrial) building of the mining and processing plant of the Petrikovsky potassium salt deposit in the Republic of Belarus. In this work, the experience of manufacturing and using strain gauges based on strain gages was presented. The results of measurementswas demonstrated.The problems of installation and use was described as well asthe technical solutions were discussed. 2. The monitoring object The object of monitoring is a steel building structure with a height of 63 meters. This construction provides the rising of potash salt from the mine 800 meters deep. The structure of the building is constructed of steel columns, beams and reinforced concrete floor slabs. The building includes a bunker for storing salt, a conveyor belt, and mechanisms for lifting ore. All of these factors determine the difficult operating conditions of the structure. The conveyor belt, as well as the ore lifting mechanisms, exerts significant dynamic loads on the metal frame. The annual temperature drop in the environment and difficult geological conditions create large quasi-static loads. Also, the structure has a complex history of construction in conditions of freezing of the foundation soils. There is reason to believe that some of the foundation elements are located on frozen ground, which is melting. Melting frozen soils can potentially lead to unplanned vertical movements. All this creates a complex stress-strain state for the research object.The object of study is shown in Figure 1. Figure 1a shows a building in the construction process. Figure 1b shows a completed building.

Fig. 1. (a) building in the construction process; (b) completed building.

3. Complex automated deformation monitoring system 3.1 System structure

A complex system for monitoring the deformation parameters of a structure in real time was created for round the-clock analysis of the stress-strain state of a construction object. The whole system consists of several blocks: a block for monitoring the vertical displacements of the bearing columns at 16 points, a block for monitoring the