PSI - Issue 48

Igor Shardakov et al. / Procedia Structural Integrity 48 (2023) 127–134 Shardakov et al/ StructuralIntegrity Procedia 00 (2023) 000 – 000

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3.4. Presentation of information on the website The data obtained by the automated monitoring system is analyzed and presented in a convenient form on the developed website. Fig. 7 shows information blocks that display actual data on each of the controlled parameters, formed by individual units of the monitoring system. These blocks are located on the home page of the website and contain links to the pages illustrating the operation of each unit of primary sensors. On these pages, you can trace the history of each deformation parameter over an arbitrary time interval, as well as compare the current value of the parameter with the maximum allowable one. On the home page of the site, summary information is presented in convenient form, comparing the three main controlled characteristics with the maximum allowable values. The horizontal displacement of the metal structure at a height of 58m (at the level of the hoist pulley axles) should not exceed 120mm. This limitation is due to the requirements of the normal operation of the lifting mechanism. The range of allowable values of horizontal devi-ations is shown as a red circle (Fig. 7a), and the current position of the top of the structure is marked with a red dot. Permissible settlements of supporting columns are such displacements at which the entire structure does not lose stability. For each spatial configuration of vertical displacements, the limiting state is considered to be such a state in which, with an increase in all observed settlements by a factor of K, there is a loss of stability in some structural elements. The solution of the stability problem is carried out by the finite element method using the ANSYS software. In diagram Fig. 7b, the red rectangle indicates the current values of the settlement, and the green one shows the "reserve of the settlement" that is available until the moment of loss of stability of the structure. Similarly, the final information on the block of strain gauges is given (Fig. 7c). The red rectangle indicates the current maximum value of the strain at the bases of the supporting columns, and the green rectangle shows the reserve until the limit deformation is reached. The thermometry block reflects the current temperature at the object (Fig. 7c). a b c d

Inclinometry unit

Hydroleveling unit

Tensometry unit

Thermometry

Fig. 7. Summary information about the current state of the structure.

4. Conclusion The developed system of deformation monitoring allows online control of the main deformation processes in the overhead building of the skip shaft caused by the action of various quasi-static and dynamic factors. The developed system has been successfully operating for 3 years. Data of quasi-static measurements are taken once every 10 minutes. Dynamic measurements are made once a day. The accumulated and incoming experimental information provides an assessment of the current deformation state of the structure. Moreover, this information makes it possible to assess the trends in the state of the object and to predict the development of deformation processes for about 1 year in advance. Further improvement of the system is planned in this direction. The system has demonstrated stable operation over a long period. It is easy to maintain, promptly provides sufficiently complete information about the deformation state of the object. However, during the operation, some problems were identified. One of these problems is a decrease in the reliability of hardware in an aggressive environment caused by salt dust (for example, degradation of strain gauges).