Bibei bridge (case study)

The Bibei bridge, was originally built during the Roman period, and it has three barrel arches. Stand out the different modifications bridge modifications over history, such as the restoration tasks performed during the twentieth century, when the former pathway along the entire bridge was filled. Moreover, of the hypothesis concerning a probable reconstruction of the first arch in the nineteenth century.

Object description

(No object description available.)

Civil engineering type

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Road network Bridge

Year of construction

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Composed of materials

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Rock, Masonry

Location coordinates

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42° 20' 1.66" N, 7° 12' 52.21" W

Country

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Spain

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Object analysis

(No analysis summary available.)

Case type

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Research

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Object state

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.

Observed deterioration processes

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Meteorological conditions and change from original use.

Observed damage types

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Performance indicators

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Electrical properties

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