Roman Bridge of Lugo (case study)

The Lugo Bridge has eight gothic or canyon arches that range from 5.6 to 10.4 m. This bridge’s current appearance is the result of several reconstruction and restoration tasks from many eras (Roman –it was part of the Via XIX of the Antonino Itinerary in the III century–Medieval, XVII, XIX, and XX century). Consequently, different building materials such as granite and schist are observed in the stonework surface. Also, although this bridge has a horizontal profile today, the Lugo Bridge had a double-sided medieval profile until the end of the 19th century.

Object description

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Civil engineering type

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Road network Bridge

Year of construction

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Composed of materials

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Steel, Masonry

Location coordinates

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43° 0' 6.99" N, 7° 33' 48.95" W

Country

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Spain

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Object analysis

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Case type

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Research

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Object state

Two longitudinal parallel profiles in opposite directions along the bridge, each 122 m in length, were collected using a RAMAC/GPR system from MALÅ Geoscience with 250 and 500 MHz shielded antennas. Data acquisition was based on constant distance intervals following the common offset mode, and the survey parameters previously selected. Later GPR processing filters were employed in order to reduce clutter or any unwanted noise in the raw-data. The geometry, condition and size of this reflector allow to conclude the original double slope profile as well as the response of the transversal reinforcements and the existence of masonry and filling materials within the bridge structure. Finally, a comparison of real data is performed with synthetic models, allowing the extraction of subtle interpretive information to produce a comprehensive data interpretation.

Observed deterioration processes

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Observed damage types

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Performance indicators

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Electrical properties

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Documents

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