Bridge of Traba (case study)

The Traba Bridge is a 14th century bridge with four arches that extend from 4.8 to 7.0 m. Two of these arches are barrel arches, while the other two are Gothic arches. These differences in geometric shape are probably due to two different times for masonry construction. The Gothic arches of the original bridge structure and the barrel arches of a later restoration. This bridge represents an integral part of the traditional Galician architectural heritage and requires constant diagnosis because this bridge is still in use within the transport infrastructure, so it has been modified for new functions supporting now increases in traffic loads and intense vibrations.

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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Masonry

Location coordinates

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42° 47' 7.36" N, 8° 53' 0.94" 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. A three-dimensional model of the bridge is also constructed using a terrestrial laser scanner, and the surface texture of the object is captured using a semi-metric digital camera. Two types of scans are ejected at each scan position: first, a low resolution is acquired to have the overall geometry of the bridge and its surroundings, and then detailed scans are captured with a maximum spatial resolution of the entire bridge. Finally, the precise external geometric measurements of the bridge, as well as the orthophotography provided by laser scanning, are used as inputs to create synthetic radargrams.

Observed deterioration processes

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Meteorological conditions - excess humidity

Observed damage types

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Performance indicators

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Electrical properties, Other actions (wind/temperature/earthquake)

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Documents

This case study was contributed by Gabriel Suárez of Universidad De Vigo. Last edited by technical staff.