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Keywords: close range photogrammetry, ground penetrating radar, finite element method, historic structures, dynamics.

Summary

This paper presents a general method for the process of evaluating a masonry structure, considering the fact that the geometry of the structure is complex and that its material properties are unknown and cannot be directly assessed [1]. A multidisciplinary approach is presented that integrates close range digital photogrammetry, ground penetrating radar (GPR) and finite element (FE) analysis.

Close range digital photogrammetry and GPR techniques are used in the geometric survey and building material homogeneity analysis [2,4,5]. The interpretation of the GPR data is used as a starting point to build a hypothesis for the numeric model, while considering the material properties of the structure. The resulting information is used to properly define a finite element-based three-dimensional structural model, which is then applied to simulate the dynamic behaviour of the bridge and two hypotheses about its internal composition.

There are two different three-dimensional FE models [3] prepared for the bridge dynamic analysis. The first model is homogeneous, and has the same material properties in all volumes; the second model is heterogeneous, and contains two components of material data from the GPR tests [6]. The results reveal discrepancies in the eigenmodes of the two models, indicating that the two numerical models are not equivalent. Even if the range of the eigenfrequency values of both models is not considerably wide, quite different shapes of their modes indicate the usefulness of the GPR data. However, the proper decision as to which model better represents the tested structure will depend on measurements of the natural vibrations of the bridge.

References

1: P. Arias, J. Armesto, D. Di-Capua, R. González-Drigo, H. Lorenzo, V. Pérez-Gracia, "Digital photogrammetry, GPR and computational analysis of structural damages in a mediaeval bridge", Engineering Failure Analysis, 14(8), 1444-1457, 2007. doi:10.1016/j.engfailanal.2007.02.001
2: L. Binda, G. Lenzi, A. Saisi, "NDE of masonry structures: use of radar tests for the characterization of stone masonries", NDT&E Int, 31, 411-419, 1998. doi:10.1016/S0963-8695(98)00039-5
3: J.W. Bull (ed.), "Computational Modelling of Masonry, Brickwork and Blockwork Structures", Saxe-Coburg Publications, 2001. doi:10.4203/csets.6
4: C. Colla, P.C. Dast, D. McCann, M.C. Forde, "Sonic, electromagnetic and impulse radar investigation of stone masonry bridges", NDT&E Int., 30(4), 249-254, 1997. doi:10.1016/S0963-8695(96)00067-9
5: I. Lubowiecka, P. Arias, J. Armesto, "3D photogrammetric modelling for fem structural analysis", Modern Building Materials, Structures and Techniques Proceedings of the 9th International Conference, May 16-18, 2007, Vilnius, "Technika", 1-6, 2007.
6: L. Topczewski, F.M. Fernandes, P.J.S Cruz, P.B. Lourenço, "Practical implications of GPR investigation using 3D data reconstruction and transmission tomography", Journal of Building Appraisal 3, 59-76, 2007. doi:10.1057/palgrave.jba.2950060

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 88 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and M. Papadrakakis Paper 239 Masonry Bridge Finite Element Modelling Based on Digital Photogrammetry and Ground Penetrating Radar Tests I. Lubowiecka¹, J. Armesto², F.I. Rial² and P. Arias² ¹Department of Structural Mechanics and Bridge Structures, Gdansk University of Technology, Poland ²Department of Natural Resources Engineering and Environmental Engineering, University of Vigo, Spain doi:10.4203/ccp.88.239 purchase the full-text of this paper Full Bibliographic Reference for this paper I. Lubowiecka, J. Armesto, F.I. Rial, P. Arias, "Masonry Bridge Finite Element Modelling Based on Digital Photogrammetry and Ground Penetrating Radar Tests", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 239, 2008. doi:10.4203/ccp.88.239 Keywords: close range photogrammetry, ground penetrating radar, finite element method, historic structures, dynamics. Summary This paper presents a general method for the process of evaluating a masonry structure, considering the fact that the geometry of the structure is complex and that its material properties are unknown and cannot be directly assessed [1]. A multidisciplinary approach is presented that integrates close range digital photogrammetry, ground penetrating radar (GPR) and finite element (FE) analysis. Close range digital photogrammetry and GPR techniques are used in the geometric survey and building material homogeneity analysis [2,4,5]. The interpretation of the GPR data is used as a starting point to build a hypothesis for the numeric model, while considering the material properties of the structure. The resulting information is used to properly define a finite element-based three-dimensional structural model, which is then applied to simulate the dynamic behaviour of the bridge and two hypotheses about its internal composition. There are two different three-dimensional FE models [3] prepared for the bridge dynamic analysis. The first model is homogeneous, and has the same material properties in all volumes; the second model is heterogeneous, and contains two components of material data from the GPR tests [6]. The results reveal discrepancies in the eigenmodes of the two models, indicating that the two numerical models are not equivalent. Even if the range of the eigenfrequency values of both models is not considerably wide, quite different shapes of their modes indicate the usefulness of the GPR data. However, the proper decision as to which model better represents the tested structure will depend on measurements of the natural vibrations of the bridge. References 1 P. Arias, J. Armesto, D. Di-Capua, R. González-Drigo, H. Lorenzo, V. Pérez-Gracia, "Digital photogrammetry, GPR and computational analysis of structural damages in a mediaeval bridge", Engineering Failure Analysis, 14(8), 1444-1457, 2007. doi:10.1016/j.engfailanal.2007.02.001 2 L. Binda, G. Lenzi, A. Saisi, "NDE of masonry structures: use of radar tests for the characterization of stone masonries", NDT&E Int, 31, 411-419, 1998. doi:10.1016/S0963-8695(98)00039-5 3 J.W. Bull (ed.), "Computational Modelling of Masonry, Brickwork and Blockwork Structures", Saxe-Coburg Publications, 2001. doi:10.4203/csets.6 4 C. Colla, P.C. Dast, D. McCann, M.C. Forde, "Sonic, electromagnetic and impulse radar investigation of stone masonry bridges", NDT&E Int., 30(4), 249-254, 1997. doi:10.1016/S0963-8695(96)00067-9 5 I. Lubowiecka, P. Arias, J. Armesto, "3D photogrammetric modelling for fem structural analysis", Modern Building Materials, Structures and Techniques Proceedings of the 9th International Conference, May 16-18, 2007, Vilnius, "Technika", 1-6, 2007. 6 L. Topczewski, F.M. Fernandes, P.J.S Cruz, P.B. Lourenço, "Practical implications of GPR investigation using 3D data reconstruction and transmission tomography", Journal of Building Appraisal 3, 59-76, 2007. doi:10.1057/palgrave.jba.2950060 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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