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Keywords: masonry towers, numerical modelling, finite element method, masonry-like materials, nonlinear dynamics, three-dimensional scanning, geometry processing.

Summary

The assessment of monumental buildings involves performing a series of operations requiring various types of expertise and technologies. This paper describes the work done by the Mechanics of Materials and Structures Laboratory and the Visual Computing Laboratory of ISTI-CNR to assess the vulnerability of the 13th-century "Rognosa" Tower in San Gimignano, included in the UNESCO World Heritage List in 1990.

A finite element mesh of the Rognosa tower has been generated by using a three-dimensional digital model of the tower and surrounding buildings. The model has been created by first acquiring geometric data via RIEGL time-of-flight laser scanning, then processing the data using MeshLab [1], an open source software developed at the Visual Computing Laboratory and other geometry processing tools [2] specifically designed for building a three-dimensional model from a set of acquired range maps. The tower's interior geometry has been measured using classical methods. The mechanical behaviour of the structure has then been studied using the finite element code NOSA [3,4], a free downloadable software developed by the Mechanics of Materials and Structures Laboratory, which models masonry as a nonlinear elastic material with zero tensile strength and bounded compressive strength. The behaviour of the tower, subjected to its own weight and time-dependent loads simulating seismic excitations, has been investigated.

The paper highlights the importance of developing integrated procedures involving both visual computing and computational mechanics technologies to obtain realistic models of monumental structures in complex architectural contexts.

References

1: P. Cignoni, M. Callieri, M. Corsini, M. Dellepiane, F. Ganovelli, G. Ranzuglia, "MeshLab: an Open-Source Mesh Processing Tool", Sixth Eurographics Italian Chapter Conference, 129-136, 2008. http://meshlab.sourceforge.net
2: M. Callieri, P. Cignoni, F. Ganovelli, C. Montani, P. Pingi, R. Scopigno, "VCLab's Tools for 3D range data processing", 4th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage (VAST2003) and First EUROGRAPHICS Workshop on Graphics and Cultural Heritage, Brighton, United Kingdom, 5-7 November 2003.
3: M. Lucchesi, C. Padovani, G. Pasquinelli, N. Zani, "Masonry constructions: mechanical models and numerical applications", Lecture Notes in Applied and Computational Mechanics, 39, Springer-Verlag, Berlin Heidelberg, 2008.
4: S. Degl'Innocenti, C. Padovani, G. Pasquinelli, "Numerical methods for the dynamic analysis of masonry structures", Structural Engineering and Mechanics, 22(1), 107-130, 2006.

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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: 93 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: Paper 138 The "Rognosa" Tower in San Gimignano: Digital Acquisition and Structural Analysis M. Callieri¹, M. Corsini¹, M. Girardi², C. Padovani², A. Pagni², G. Pasquinelli² and R. Scopigno¹ ¹Visual Computing Laboratory, ²Mechanics of Materials and Structures Laboratory, Information Science and Technologies Institute "A. Faedo", ISTI-CNR, Pisa, Italy doi:10.4203/ccp.93.138 purchase the full-text of this paper Full Bibliographic Reference for this paper M. Callieri, M. Corsini, M. Girardi, C. Padovani, A. Pagni, G. Pasquinelli, R. Scopigno, "The "Rognosa" Tower in San Gimignano: Digital Acquisition and Structural Analysis", in , (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 138, 2010. doi:10.4203/ccp.93.138 Keywords: masonry towers, numerical modelling, finite element method, masonry-like materials, nonlinear dynamics, three-dimensional scanning, geometry processing. Summary The assessment of monumental buildings involves performing a series of operations requiring various types of expertise and technologies. This paper describes the work done by the Mechanics of Materials and Structures Laboratory and the Visual Computing Laboratory of ISTI-CNR to assess the vulnerability of the 13th-century "Rognosa" Tower in San Gimignano, included in the UNESCO World Heritage List in 1990. A finite element mesh of the Rognosa tower has been generated by using a three-dimensional digital model of the tower and surrounding buildings. The model has been created by first acquiring geometric data via RIEGL time-of-flight laser scanning, then processing the data using MeshLab [1], an open source software developed at the Visual Computing Laboratory and other geometry processing tools [2] specifically designed for building a three-dimensional model from a set of acquired range maps. The tower's interior geometry has been measured using classical methods. The mechanical behaviour of the structure has then been studied using the finite element code NOSA [3,4], a free downloadable software developed by the Mechanics of Materials and Structures Laboratory, which models masonry as a nonlinear elastic material with zero tensile strength and bounded compressive strength. The behaviour of the tower, subjected to its own weight and time-dependent loads simulating seismic excitations, has been investigated. The paper highlights the importance of developing integrated procedures involving both visual computing and computational mechanics technologies to obtain realistic models of monumental structures in complex architectural contexts. References 1 P. Cignoni, M. Callieri, M. Corsini, M. Dellepiane, F. Ganovelli, G. Ranzuglia, "MeshLab: an Open-Source Mesh Processing Tool", Sixth Eurographics Italian Chapter Conference, 129-136, 2008. http://meshlab.sourceforge.net 2 M. Callieri, P. Cignoni, F. Ganovelli, C. Montani, P. Pingi, R. Scopigno, "VCLab's Tools for 3D range data processing", 4th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage (VAST2003) and First EUROGRAPHICS Workshop on Graphics and Cultural Heritage, Brighton, United Kingdom, 5-7 November 2003. 3 M. Lucchesi, C. Padovani, G. Pasquinelli, N. Zani, "Masonry constructions: mechanical models and numerical applications", Lecture Notes in Applied and Computational Mechanics, 39, Springer-Verlag, Berlin Heidelberg, 2008. 4 S. Degl'Innocenti, C. Padovani, G. Pasquinelli, "Numerical methods for the dynamic analysis of masonry structures", Structural Engineering and Mechanics, 22(1), 107-130, 2006. 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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