Non-Destructive Testing of Building Objects Positioned in the Area of Coal Exploitation

Abstract:

In this paper the results of modal analysis of a four storey building are presented. To excite the investigated structure, impact excitation was applied in two different points located on pillars supporting the building. In order to extract dynamic parameters of the structure, experimental modal analysis was applied. The parameters of vibration resulting from this excitation were measured by a scanning laser vibrometer; additionally piezoelectric accelerometers were utilized. To compare the results and monitor the state of the building a finite element model (FE) was built. It seems that a reliable identification of the state of building structures using a laser scanning vibrometer is feasible and relevant from a practical point of view. To monitor local changes additional piezoelectric accelerometers should be used. Moreover, it is applicable for damage detection to refine theoretical and experimental modal models for each natural frequency and to calculate the stress distribution for each refined model. Consequently, the sum of these particular stresses conveys information for building engineers and enables comparison with their in situ observations. The analysed building is situated on the terrain of underground coal mine exploitation so the aim of the research is not only to observe the state of the building but also to analyse possible changes during the process of excavation and after it was completed.

• Periodical: Key Engineering Materials (Volume 518)
• Pages: 228-237
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.518.228
• Online since: July 2012
• Authors: Andrzej Staniek
• Keywords: Building, Coal Exploitation, Impact Excitation, Modal Analysis, Nondestructive Testing (NDT), Scanning Laser Vibrometer

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