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G. Camata¹, L. Cifelli¹, E. Spacone¹, J. Conte², M. Loi³ and P. Torrese⁴

¹Department of Design, Rehabilitation and Monitoring of Structures, University of Chieti-Pescara, Italy
²Department of Structural Engineering, University of California at San Diego, La Jolla CA, USA
³Department of Science and History of Architecture and Restoration, University of Chieti-Pescara, Italy
⁴Department of Earth Sciences, University of Pavia, Italy

Keywords: seismic vulnerability, response spectrum, non-linear analysis, damage model, plasticity model, soil-foundation-structure interaction.

Summary

This paper presents the results of a seismic vulnerability assessment of an ancient tower erected in the XIV century and located in Guardiagrele, Chieti province (Italy). An extensive in situ experimental assessment was conducted to identify the material properties and the geometry of the tower as well as the stratigraphy of the supporting soil. The tower natural frequencies and mode shapes are extracted from ambient vibration data using state-of-the-art system identification techniques.

The onsite investigation results were used to calibrate a three-dimensional finite element model of the tower in which the foundation soil was explicitly modelled in order to study the effects of the soil-foundation-structure interaction. Results from the modal analysis showed a good correlation between the elastic properties of the model and the ambient vibration data.

Realistic linear and nonlinear constitutive models for cyclic loading were used for the structural and soil materials. The tower was modelled with damage-coupled plasticity both in tension and compression. The ground was modelled with linear base conditions to study the influence of the ground flexibility on the tower response. The seismic safety was evaluated with nonlinear time-history analyses (NLTHA).

Results to date show the importance of the selection of the input ground motion for the NLTHA as well as the importance of the correct evaluation of the structure geometry and mechanical properties. In particular, the results indicate that a rigorous evaluation of the seismic vulnerability should consider the historical seismic activity related to the seismogenic zones as well as the frequency content of the input.

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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 58 Seismic Safety Assessment of the Tower of the S. Maria Maggiore Cathedral in Guardiagrele, Italy G. Camata¹, L. Cifelli¹, E. Spacone¹, J. Conte², M. Loi³ and P. Torrese⁴ ¹Department of Design, Rehabilitation and Monitoring of Structures, University of Chieti-Pescara, Italy ²Department of Structural Engineering, University of California at San Diego, La Jolla CA, USA ³Department of Science and History of Architecture and Restoration, University of Chieti-Pescara, Italy ⁴Department of Earth Sciences, University of Pavia, Italy doi:10.4203/ccp.88.58 purchase the full-text of this paper Full Bibliographic Reference for this paper G. Camata, L. Cifelli, E. Spacone, J. Conte, M. Loi, P. Torrese, "Seismic Safety Assessment of the Tower of the S. Maria Maggiore Cathedral in Guardiagrele, Italy", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 58, 2008. doi:10.4203/ccp.88.58 Keywords: seismic vulnerability, response spectrum, non-linear analysis, damage model, plasticity model, soil-foundation-structure interaction. Summary This paper presents the results of a seismic vulnerability assessment of an ancient tower erected in the XIV century and located in Guardiagrele, Chieti province (Italy). An extensive in situ experimental assessment was conducted to identify the material properties and the geometry of the tower as well as the stratigraphy of the supporting soil. The tower natural frequencies and mode shapes are extracted from ambient vibration data using state-of-the-art system identification techniques. The onsite investigation results were used to calibrate a three-dimensional finite element model of the tower in which the foundation soil was explicitly modelled in order to study the effects of the soil-foundation-structure interaction. Results from the modal analysis showed a good correlation between the elastic properties of the model and the ambient vibration data. Realistic linear and nonlinear constitutive models for cyclic loading were used for the structural and soil materials. The tower was modelled with damage-coupled plasticity both in tension and compression. The ground was modelled with linear base conditions to study the influence of the ground flexibility on the tower response. The seismic safety was evaluated with nonlinear time-history analyses (NLTHA). Results to date show the importance of the selection of the input ground motion for the NLTHA as well as the importance of the correct evaluation of the structure geometry and mechanical properties. In particular, the results indicate that a rigorous evaluation of the seismic vulnerability should consider the historical seismic activity related to the seismogenic zones as well as the frequency content of the input. 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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