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Sulaimon Olanrewaju Adebiyi, Emmanuel Olateju Oyatoye and Joseph Nnamdi Mojekwu
Marianna Greta and Mieczysław Pakosz
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Jiří Balcar, Lenka Filipová and Zuzana Machová
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Ján Kortiš, Ľuboš Daniel, Milan Škarupa and Maroš Ďuratný
The experimental modal analysis is often used to validate the accuracy of dynamic numerical models. It is also a good tool to obtain valuable information about current condition of the structures that could help to determine residual lifetime. The quality of modal testing results is highly dependent on the proper estimation of the natural frequencies from the frequency response function. This article presents the experimental modal test of the laboratory steel structure in which the natural frequencies and mode shapes are determined.
Oto Makýš, Peter Krušinský, Renáta Korenková and Dominika Šrobárová
The paper deals with the lifetime of wooden poles, situated in the archaeological open-air museum Liptovská Mara - Havránok, which were erected outdoors about 12 years ago. It is aimed at diagnosing their condition using sonic tomography. The poles differ from each other in the location, anchorage, and positioning in terms of the terrain slope. Investigation was focused on the free-standing poles (quasi sacrifice poles) and the poles that are part of the fortification (gates and walls). Measurements were carried out using the device Fakopp ArborSonic 3D Sonic Tomograph that has 18 sensors. It measures the sonic response (sound velocity) in a tree stem. Sound wave velocity within sound wood depends on its species, moisture content, and the direction of measurement. Measurements brought remarkable results.
Josef Vičan, Jozef Gocál, Jaroslav Odrobiňák and Peter Koteš
The article describes general principles and basis of evaluation of existing railway bridges based on the concept of load-carrying capacity determination. Compared to the design of a new bridge, the modified reliability level for existing bridges evaluation should be considered due to implementation of the additional data related to bridge condition and behaviour obtained from regular inspections. Based on those data respecting the bridge remaining lifetime, a modification of partial safety factors for actions and materials could be respected in the bridge evaluation process. A great attention is also paid to the specific problems of determination of load-caring capacity of steel railway bridges in service. Recommendation for global analysis and methodology for existing steel bridge superstructure load-carrying capacity determination are described too.
Josef Vičan, Jozef Jošt and Jozef Gocál
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Sulaimon Olanrewaju Adebiyi, Emmanuel Olateju Oyatoye and Owolabi Lateef Kuye
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Michaela Jánská and Petra Olšová
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Ján Jerga and Ľudovít Krajči
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