New solution of shaker's supporting structure intended to railway bridges testing

Dynamic Tests in Bridge Health Monitoring

“…Systematics of bridge dynamic tests considering various methods of structure vibration excitation, the measured and analyzed parameters as well as possibilities of their applications in Bridge Health Monitoring are presented in Figure 2. Taking into account the types of structure vibration excitation, three main groups of bridge dynamic tests can be distinguished: [11][12][13][14][15]25] -ambient vibration tests under dynamic loads caused by special vehicles or regular traffic as well as vibrations initiated by environmental loads (e.g., wind, earthquakes); -forced vibration tests performed by means of special exciters (mechanical, hydraulic, etc.) with controlled excitation parameters -placed on the structure; -free vibration tests achieved by means of special techniques like applied and suddenly released deflection, single impulse load, stopping vehicle and so on.…”

Modal Analysis of Bridge Structures by Means of Forced Vibration Tests / Tilto Konstrukcijų Modalinė Analizė Taikant Priverstinės Vibracijos Testus

“…The results of CMA tests are mainly used to assess the condition of the structure, including damage detection (e.g. Alampalli 2000;Doebling et al 1996;Maia et al 2003;Skoczyński et al 2006Skoczyński et al , 2009Zwolski 2007). This experimental technique is also very useful in the calibration of theoretical models of bridge structures.…”

“…The system was developed by a research team (Bień et al 2006;Skoczyński et al 2006Skoczyński et al , 2009Zwolski 2007) from Wrocław University of Technology (WUT) and it consists of the following components ( − a measuring device with response sensors; − 2 portable power generators; − a measuring device with temperature and humidity sensors. Work on the MANBRIS system started within the framework of the Research Project 8TO7E/04020 "A method of the experimental identification of the dynamic characteristics of bridge structures using an inertial exciter" funded by the Polish State Committee for Scientific Research.…”

“…One of the most promising techniques of experimental dynamics is the Classical Modal Analysis (CMA) based on the Forced Vibration Test (e.g. Bień et al 2006;Ewins 2000;Skoczyński et al 2006Skoczyński et al , 2009Zwolski 2007). Through such an experimental modal analysis one can determine the natural vibration frequencies, the corresponding mode shapes and the damping characteristics of bridges.…”

“…The system has been successfully used in the dynamic testing of over 10 bridge structures (e.g. Bień et al 2004;Skoczyński et al 2006Skoczyński et al , 2009Zwolski 2007). The results of the theoretical and experimental research on the Forced Vibration Test have been included in international recommendations (Guideline 2008).…”