A team of Wroclaw University of Technology (WUT) is developing a monitoring system based on forced vibration tests. The tests, repeated periodically, have as a main goal to identify and monitor the modal parameters of the structure. It is expected that on the basis of the changes of construction modal parameters some conclusions concerning structure condition can be drawn. All components of the developed system for condition monitoring of railway bridges has been verified and tested in laboratory with regard to its usefulness and efficiency in the system. The tests have been also carried out in order to confirm the system stable and failure-free work. During the laboratory tests some problems related to natural frequencies of the exciter supported on the frame and the force gauges have been solved. To verify the stability of the system working in field a pilot test of steel railway bridge have been conducted. Results of the test showed efficiency of the exciter in inducing stable vibration of the structure and proved usefulness and safe work of the control software MANABRIS. Field test showed also needs of improvements in the exciter construction as well as in functionality of the control software. Future tests will be focused on the system ambient temperature sensitivity as well as on issues related to damage detection sensitivity. The designed tests will determine the system resolution i.e. the smallest size of damage possible to detect by means of applied damage detection algorithm. Conclusions of both laboratory and field tests will enable preparation of a special guideline devoted to forced vibration tests of bridge structures, their modal analysis and damage detection based on changes of modal parameters of bridges.


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    Title :

    System for monitoring of steel railway bridges based on forced vibration tests


    Additional title:

    System zur Überwachung von Eisenbahnbrücken basierend auf erzwungene Schwingungstests


    Contributors:
    Bien, J. (author) / Rawa, P. (author) / Zwolski, J. (author) / Krzyzanowski, J. (author) / Skoczynski, W. (author) / Szymkowski, J. (author)


    Publication date :

    2006


    Size :

    8 Seiten, 8 Bilder, 1 Tabelle, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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