The Specificity of Dynamic Resistance of Existing Bridge Structures in Mining Areas
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RESEARCH PAPER
The Specificity of Dynamic Resistance of Existing Bridge Structures in Mining Areas Dawid Mrozek1
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Magdalena Mrozek1
Received: 24 February 2020 / Revised: 20 July 2020 / Accepted: 24 September 2020 The Author(s) 2020
Abstract The article presents the results of a dynamic resistance analysis of selected existing bridge structures. The numerical calculations performed with the use of THA (time history analysis) pertained to road and rail bridges of steel and concrete structures—not paraseismically designed. The purpose of the work was to determine the dynamic resistance of objects to the influence of paraseismic impacts resulting from mining operations. The specificity of performing calculations in this area of engineering issues is presented. Real mining tremor signals, registered in the vicinity of the objects were used in the numerical analyses. The correct determination of the dynamic resistance of the object can be used as a basis for performing repair/strengthening of existing objects, which in the future will be loaded with additional paraseismic influences. Keywords Time history analysis Paraseismic activity Dynamic resistance Numerical analyses Existing bridge structure Gabor transform
1 Introduction Bridge structures are an important element of infrastructure in urban areas. Through the use of bridge structures, it becomes possible to overcome obstacles, such as rivers or valleys. Often, such constructions are located in areas, where soil accelerations of paraseismic origin occur. In such cases, these existing objects should be subject to an estimation of dynamic resistance if they are not paraseismically designed in advance. Their value should be sufficient to safely transfer additional dynamic influences of, e.g., mining origin. There are a number of buildings erected before mining operations begin, and that is why they are usually not designed with the possible paraseismic impact properly taken into account. Additionally, during use, the bridge may be damaged or its condition will deteriorate over time (e.g., due to the impact of various atmospheric & Dawid Mrozek [email protected] Magdalena Mrozek [email protected] 1
Department of the Mechanics and Bridges, Faculty of Civil Engineering, Silesian University of Technology, RB-5, Akademicka 5, 44-100 Gliwice, Poland
conditions). Hence, it becomes necessary to estimate the current resistance of the real bridge object and compare it with the predicted dynamic impact resulting from human activity in the vicinity of the bridge location. Intensive human activity in industrial areas, manifested in mining exploitation of deposits, including hard coal, is a source of static and dynamic subsoil impacts on buildings. These impacts can cause damage to objects due to a lack of adequate protection and poor technical condition of these structures. Some regions in Poland, e.g., Upper Silesia, are constantly exposed to mining tremors with peak acceleration values of up to 2 m/s2.
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