PSI - Issue 48

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Shardakov et al/ StructuralIntegrity Procedia 00 (2023) 000 – 000

128 * Corresponding author. Tel.: /; fax: /. E- mail address: shardakov@icmm.ru

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

The scientific literature provides numerous examples of the description of deformation monitoring systems for complex and critical engineering structures, using various methods for assessing the state of the structure. These are the control of the vibrational properties in the structure, Yang at al. (2023), Liao and Chiu (2019); the assessment of deformations using distributed fiber-optic sensors, Ye at al. (2014), Costa and Figueiras (2012); laser scanning methods, Jia at al. (2021). The composition and principles of operation of each monitoring system are individual and are determined by the properties of the object and the tasks set. However, most of these systems are aimed at controlling either the static or dynamic properties of the structure. The approaches we developed earlier, Shardakov at al. (2016), (2018), (2020), allow us to design deformation monitoring systems covering a wide range of deformation processes, from quasi-static to dynamic. This paper presents an automated system for deformation monitoring of the metal structure of the overhead building of the skip shaft, developed and created by the authors. This facility is a part of the Petrikov mining and processing complex located at the city of Petrikov (Rep. Belarus). The developed system of deformation monitoring is aimed at preventing accidents caused by damage to structural elements as a result of man-made impacts and environmental influences. The automated monitoring system was developed at the Institute of Continuum Mechanics of the Ural Branch of the Russian Academy of Sciences (Perm, Russia). It was installed at the site in 2021 immediately after the completion of the structure. The paper presents the main characteristics of this system and demonstrates the data accumulated over 3 years of its operation. 2. Object of monitoring The overhead building of the skip shaft is a metal structure 64.350 m high, which ensures the lifting of ore from the mine and its transfer to the factory for further processing. The structure is a prefabricated welded rod system. The load-bearing elements are rolled steel columns connected by vertical and horizontal ties. The structure rests partly on the pile foundation and partly on the reinforced concrete head of the skip shaft. The deformation state of the structure is determined by the loads associated with the operation of the process equipment, external factors (wind, seasonal and daily temperature fluctuations), and interaction between the structure and foundation. Metal elements are exposed to corrosion caused by the presence of salt dust in the air and the deposited droplets of saline solution. Figure 1 shows a photo of the structure and its diagram as well as the main operating loads. The stress-strain state of the structure is formed under the influence of the following factors: static loads caused by the weight of the structure and uneven settlement of the supporting columns; dynamic and static loads associated with various stages of the technological process, such as lifting, unloading and transporting ore. The analysis of the stress-strain state of the structure using finite element modeling made it possible to identify the most loaded places, estimate the maximum stresses and local deformations in the main structural elements, and also analyze the possibility of buckling of individual elements. Based on the simulation results, the main monitoring parameters were selected. These include: settlements of load-bearing columns; deformations of the lower part of the bearing columns; deviation of the structure from the vertical; vibration characteristics of the structure. 3. The main parts of the monitoring system The developed monitoring system includes several blocks of primary sensors distributed over a number of key points of the object. These are the blocks of hydraulic leveling, inclinometry, tensometry and vibrometry. An additional controlled parameter is the temperature of the main structural elements. The presence of several independent units for recording deformation parameters makes it possible to collect sufficiently complete information, as well as to mutually control the readings of various measuring systems.

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