Measurements of dynamic properties of a medium span suspension bridge by using the wavelet transforms

摘要: Abstract The aim of this paper is to show the capabilities real-time kinematic (RTK) global positioning network system (GPS) measure low-frequency vibration a medium span suspension bridge. In particular, presents results studies conducted on identification modal parameters including natural frequencies, damping coefficients and mode shapes bridge using ambient excitation loads. A was designed installed Nottingham Wilford Bridge provide long-term measurement deck movement. An approach estimate parameters, from only output data in time domain wavelet transform, presented. Displacements responses are used transform identify its dynamic characteristics. properties were extracted two-step methodology. first step, random decrement method signals free responses. Secondly, wavelets-based technique extract frequencies determine structure. This compared with well-established techniques eigensystem realisation algorithm showing difference 1% estimated frequency. efficiency RTK–GPS demonstrated full-scale measurement. showed that can be for extracting in-service-loads induced (