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Abstract

The paper presents the results of research concerning the assessment of dynamic resistance of existing industrial hall structures located in areas with different seismic activity. The basis for analyses was a three-nave industrial hall with a steel structure. Numerical calculations were performed using the finite element method (FEM), using the response spectrum method in dynamic analysis. The calculations were carried out in variants, using standard accelerated response spectra according to Eurocode 8 and those determined for the Upper Silesian Coal Basin (USCB) and Legnica-Glogow Copper District (LGCD) area. Using the author's procedure for the assessment of the dynamic resistance, for each of the extortion analysed, the structure's response to the dynamic excitation was compared with the effects of load combinations adopted at the design stage, thus establishing the limit values of the design horizontal ground acceleration a max/g,h understood as the structure's resistance to tremors. This allowed to assess the impact of seismic activity from a specific area on the dynamic resistance of the subjected object. The article also discusses the way of interpretation and the scope of application of the obtained results and proposed procedure.

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Authors and Affiliations

Janusz Rusek
ORCID: ORCID
Leszek Słowik
ORCID: ORCID
Karol Firek
Michał Pitas
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Abstract

The paper presents the author’s approach to evaluating the dynamic resistance of existing building structures exposed to the action of paraseismic events. The idea of the approach was demonstrated in the example of an existing conveyor bridge, which is an important component of an industrial plant located in an area threatened by the occurrence of mining tremors. A scenario was analysed in which the object’s structure was not adapted to absorb additional dynamic effects. Therefore, it was necessary to determine the load-bearing capacity reserve within which the dynamic effects induced by a mining tremor could be allowed. As part of the analysis, criteria for selecting the authoritative section of the analysed object for further dynamic calculations were established and described in detail. As a result of the implemented evaluation procedure, the limiting values of the ground acceleration components were obtained, which are understood as the resistance of the analysed object in the context of carrying additional dynamic actions induced by a tremor. The determined resistance is included in the ultimate limit state STR framework, which sets the level of strength of particular structures’ components as a criterion. The limit values of the ground acceleration components were calibrated, taking into account other accompanying variable actions according to the Eurocodes guidelines. The study also justified using this approach and provides essential information about dynamic excitation’s most sensitive structural components. Such information can direct the process of retrofit or necessary strengthening of the structure when the evaluated resistance will exceed the intensity of existing or predicted seismic events in the area.
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Authors and Affiliations

Janusz Rusek
1
ORCID: ORCID
Leszek Słowik
2
ORCID: ORCID
Dagmara Rataj
1
ORCID: ORCID

  1. AGH University of Science and Technology, Faculty of Mining Surveying and Environmental Engineering, Department of Engineering Surveying and Civil Engineering, Al. Mickiewicza30, 30-059 Kraków, Poland
  2. Building Research Institute, 1 Filtrowa Str., 00-611 Warszawa, Poland
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Abstract

Mining tremors may have an impact on the safety risk of steel pipelines through their effects. It is therefore important to quantify the impact of a high-energy mining tremor in terms of strength. In addition, a comparison of the results obtained with the effect of a seismic tremor can illustrate the scale of such a hazard. Recently, this has been a very frequently raised issue in the area of surface protection against negative mining impacts and the protection of post-mining areas. Ensuring safe use is particularly important for gas transmission elements. This paper presents the results of a comparative analysis of the impact of mining tremors and seismic impacts on a specimen steel pipeline segment. The analyzed pipeline is located in the eastern part of Poland in the area of paraseismic impacts of the LGCD (Legnica-Glogow Copper District) mine. For this purpose, an analytical approach was used to assess the impact of seismic wave propagation on underground linear infrastructure facilities. Accelerogram records for the 02-06-2023 seismic tremor from Turkey and the mining tremor for 11-25-2020 were used. In the case of the design of underground pipelines, the cross-section of the element for which measures describing wall stress and the ovalization of the cross-section are determined is usually considered. In the situation of the influence of seismic wave propagation or so-called permanent ground deformation, the response of the pipeline in the longitudinal direction is analyzed. As a final result, longitudinal strains transferred to the pipeline as a consequence of the propagating seismic wave and mining tremor were determined. The absolute difference between the deformations in the ground and along the length of the pipeline was determined. This type of analysis has not been carried out before and provides new insights into the topic of paraseismic impacts on the scale of their interaction with natural earthquakes. Mining tremor data was obtained from the mine’s seismological department. The seismic tremor data, on the other hand, was downloaded via the publicly available ESM (Engineering Strong- Motion Database).
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Authors and Affiliations

Janusz Rusek
1
ORCID: ORCID
Leszek Słowik
2
ORCID: ORCID
Krzysztof Tajduś
1
ORCID: ORCID

  1. AGH University of Krakow al. Adama Mickiewicza 30, 30-059 Krakow, Poland
  2. ITB Building Research Institute ul. Filtrowa 1, 00-611 Warsaw, Poland
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Abstract

The liquidation of underground mines by the flooding leads to movements of the rock mass and land surface as a result of pressure changes in the flooded zones. The changes resulting from the rising water table caused by the changes in the stress and strain state, as well as the physical and mechanical properties of rock layers, can lead to damage to building structures and environmental changes, such as chemical pollution of the surface water. For this reason, the ability to predict the movements of rock masses generated as a result of mine closure by flooding serves a key function in relation to the protection of the land surface and buildings present thereon. This paper presents an analysis of a steel industrial portal-frame structure under loading generated by the liquidation of a mine by flooding. The authors obtained land surface uplift results for the liquidated mine and used them in a numerical simulation for the example building. Calculations were performed for different cases, and the results were compared to determine whether limit states may be exceeded. A comparison was made between the cases for the design state and for additional loading caused by the uplift of the subsurface layer of the rock mass.
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Authors and Affiliations

Mateusz Dudek
ORCID: ORCID
Janusz Rusek
ORCID: ORCID
Krzysztof Tajduś
ORCID: ORCID
Leszek Słowik
ORCID: ORCID

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