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Investigation of behaviour of metal structures with polymer dampers under dynamic loads

Abstrakt

A large number of accidents concerning structures subjected to dynamic loads have been recently observed. One of the examples of such a structure is a temporary steel grandstand erected using scaffolding system. Dynamic load that is generated by crowd movement has a significant influence on the behaviour of the structure and may lead to excessive structural vibrations. The aim of the study is to consider the idea of using polymer dampers in reduction of vibrations of metal structures exposed to dynamic loads. Firstly, the preliminary analysis of a cantilevered composite beam, consisting of two aluminium flat bars bonded with polymer mass, has been conducted. Dynamic parameters, such as modes of free vibrations, corresponding natural frequencies and damping ratios, have been determined and compared with values estimated for the plain aluminium cantilevered beam. In the second stage of the investigation, the effectiveness of using polymer damper in reduction of vibrations of a steel scaffolding grandstand under crowd load has been considered. The behaviour of the structure equipped with typical tubular stiffener as well as with the additional damper has been analysed and dynamic parameters for both models have been compared. Dynamic analyses have been focused on the peak values of accelerations and displacements of the structures analysed. The results of the study clearly show that the response of the composite aluminium beam as well as a steel scaffolding grandstand with and without polymer members is substantially different. In the case of the aluminium beam, the application of the polymer layer may lead to even ten times higher values of damping ratio and results in lower values of peak accelerations and displacements. A similar situation concerns also a steel scaffolding grandstand for which the reduction in structural vibrations after installation of additional polymer damper has been found to be substantial.

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Informacje szczegółowe

Kategoria:
Aktywność konferencyjna
Typ:
materiały konferencyjne indeksowane w Web of Science
Opublikowano w:
Procedia Engineering strony 2833 - 2837,
ISSN: 1877-7058
Tytuł wydania:
10th International Conference on Structural Dynamics (EURODYN) strony 2833 - 2837
Język:
angielski
Rok wydania:
2017
Opis bibliograficzny:
Lasowicz N., Jankowski R..: Investigation of behaviour of metal structures with polymer dampers under dynamic loads, W: 10th International Conference on Structural Dynamics (EURODYN), 2017, ,.
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.proeng.2017.09.540
Weryfikacja:
Politechnika Gdańska

wyświetlono 18 razy

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