Evaluation of ancient structures by GPR (ground penetrating radar): The arch bridges of Galicia (Spain)

Historical bridges are an integral part of the traditional architectonic heritage of a region. These ancient structures require special attention because many of them have lost their original utility and now perform different functions, which often require supporting special tension conditions. Therefore, constant diagnosis of their structure is necessary using methods that will not change the historical character of the structure. In this work, a survey methodology is proposed to analyse the viability and effectiveness of ground penetrating radar (GPR) for obtaining internal information on ancient masonry arch bridges from three points of view: historical, structural and archaeological. Several Roman or medieval bridges in the Galician territory (northwest Spain) were surveyed with GPR. An inventory was developed that includes the most relevant information obtained for their structural analysis and characterisation and to develop synergies for creating or improving the processes and services related to the evaluation, rehabilitation and maintenance of ancient structures.

[1]  P. Arias,et al.  Historic bridge modelling using laser scanning, ground penetrating radar and finite element methods in the context of structural dynamics , 2009 .

[2]  M. Frappa,et al.  GPR signals for the understanding of the shape and filling of man-made underground masonry , 2004, Proceedings of the Tenth International Conference on Grounds Penetrating Radar, 2004. GPR 2004..

[3]  D. Goodman,et al.  GPR surveying over burial mounds: correcting for topography and the tilt of the GPR antenna , 2007 .

[4]  D. M. McCann,et al.  Geophysical imaging inside masonry structures , 1999 .

[5]  T. T. Soong,et al.  State-of-the-art review: Active structural control in civil engineering , 1988 .

[6]  Michael Forde,et al.  Sonic, electromagnetic and impulse radar investigation of stone masonry bridges , 1997 .

[7]  Antonios Giannopoulos,et al.  Modelling ground penetrating radar by GprMax , 2005 .

[8]  Adem Dogangun,et al.  Turkish historical arch bridges and their deteriorations and failures , 2008 .

[9]  Zoltán Orbán,et al.  Assessment of masonry arch railway bridges using non-destructive in-situ testing methods , 2009 .

[10]  Francisco Manuel Carvalho Pinto Fernandes.  Evaluation of two novel NDT techniques: microdrilling of clay bricks and ground penetrating radar in masonry , 2006 .

[11]  Fernando I. Rial,et al.  Ground‐penetrating radar assessment of the medieval arch bridge of San Antón, Galicia, Spain , 2010 .

[12]  Henrique Lorenzo,et al.  Digital photogrammetry, GPR and computational analysis of structural damages in a mediaeval bridge , 2007 .

[13]  Lynne Mabon.  Assessment, strengthening and preservation of masonry structures for continued use in today's infrastructure , 2002 .

[14]  D. Daniels.  Ground Penetrating Radar , 2005 .