Segura Bridge is one of the best Roman Bridges conserved in the Iberian Peninsula. It is made of five arches and four pillars with triangular cutwater on the upstream side. It crosses the frontier river Eljas and over this bridge a national road communicates the councils Piedras Albas (Spain) and Segura (Portugal). According previous study the central arches of the bridge have been rebuilt in the second middle of the XVI century, after a collapse caused by growth of the river flow in 1565. In the reconstruction works the drainage area was increased, making central arches higher. Consequently, the original horizontal grad line was converted in a great sloped platform. But it is also documented a posterior reformation in the bridge , when the spandrel walls were elevated and the grad line was horizontal again.
Object description
(No object description available.)
Civil engineering type
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Year of construction
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Composed of materials
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Location coordinates
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39° 49' 2.35" N, 6° 58' 54.30" W
Country
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Object analysis
A 3D model of the bridge is built by means of a terrestrial laser scanning, and then its geometry was analyzed by two methods. Firstly, by means of a direct way, a graphical analysis in CAD systems is performed and the main geometrical parameters were obtained and evaluated; secondly, using statistical nonparametric methods, developed for this kind of structures, it is possible to identify pathologies on the structure thanks to the measurement of deformations in vaults by means of a symmetrical study.
Object state
Terrestrial laser scanning represents a fundamental tool in the inspection of bridges based on geometric analysis, if this is also combined with a correct algorithm, it allows to obtain hidden structure information. Thus, the algorithm correct used for the geometric analysis in vaults, together with the graphical representation of overlapping semi-cross sections allows visual inspection and quantification of asymmetries and distortions, facilitating diagnosis based on the arch geometry, what's allowed the detection of pathologies. Furthermore, if it's work with (X, Y, Z) coordinates, it allows locating and measure the damage to the structure.
Observed deterioration processes
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Observed damage types
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Performance indicators
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Spatial properties (concrete cover/duct voids), Anomalies (delamination/spalling)
Images
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Documents
This case study was contributed by Gabriel Suárez of Universidad De Vigo. Last edited by technical staff.