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Ambient Vibration Testing

Summary

Determination of dynamic properties of structures is the first step in assessing seismic response, and they can be measured in several ways. Controlling or knowing the input excitation usually applied by impact hammer or vibration shaker, typical for experimental modal analysis (EMA) that has been around for the past few decades, is for majority of structures difficult or practically impossible. Ambient vibration testing (AVT) or operational modal analysis (OMA), on the other hand, is the output-only modal analysis. It does not require knowledge of the input excitation, which is practically induced by wind, traffic or similar random source. This modal technology is capable of estimating the same modal parameters as the traditional known techniques: mode shape, natural frequency and damping ratio. The main goal of the project is promotion of this well-known experimental method by performing measurements of target dynamic properties on chosen structures (buildings, bridges, historic and masonry structures) and calibration of the corresponding finite element models.

Outcomes

  • Education of the staff of the R&D Center and engineers from partner companies in the field of Ambient Vibration Testing using newly acquired hardware, including in-situ measurements, basics of signal processing and numerical modelling;
  • Transfer of knowledge to students interested in writing master theses related to experimental and computational investigation;
  • Application of AVT as a solution for assessing structural behavior of buildings, bridges, historic and masonry structures which were proven seismically vulnerable during recent earthquakes in the region.

Partners:

ALL 4RDAmbient Vibration Testing