Bibei bridge (object state)
A condition of an object at a particular time, reflecting the object's ability to fulfil it's requirements.
Properties
Element type
:
Object state
Summary
:
GPR surveys are carried out using a RAMAC / GPR system from MALÅ Geoscience. Shielded 250 and 500 MHz antennas are used and data acquisition is based on constant distance intervals following the common compensation mode. A total of two parallel longitudinal profiles is generated in opposite directions along the bridge and filtered. The study includes the use of accurate metrical documentation obtained by terrestrial laser scanner. The obtained three-dimensional surface model of the bridge supplies two-dimensional orthophotographs of the structure where the main geometrical parameters can be measured. Using these structural dimensions, it is possible to estimate, by the adaptation of diffraction hyperbolas, the radar wave velocities in different zones of the whole bridge's stonework Finally, for an exhaustive interpretation, the real GPR results were also compared to finite-difference time domain (FDTD) numerical modelling data.
Performance indicator
:
Electrical properties, Electromagnetic properties
Inspection method
:
Terrestrial dedicated inspection platforms and MMS, NDT active or passive testing technologies
Relations with other elements
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Observed deterioration processes Meteorological conditions and change from original use.
The inspection method used in this case study to determine the object state was "Terrestrial dedicated inspection platforms and MMS,NDT active or passive testing technologies". This can include any of the following surveying technologies. Click one of the links below for more information:
Terrestrial dedicated inspection platforms and MMS
- Aerial UAV with optical payloads
- Light Detection And Ranging or Laser Imaging Detection And Ranging (LiDAR)
- Satellite remote sensing
NDT active or passive testing technologies