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13 results on '"Bracchi S."'

2. Modelling and Seismic Response Analysis of Existing URM Structures. Part: Archetypes of Italian Modern Buildings.

Author

Penna, A., Rota, M., Bracchi, S., Angiolilli, M., Cattari, S., and Lagomarsino, S.

Subjects
SEISMIC response, NONLINEAR analysis, ECONOMIES of scale, ARCHETYPES, CITIES & towns, MASONRY, OFFSHORE structures
Abstract

Five existing unreinforced masonry buildings, built in different Italian cities in a relatively recent time frame, were selected to study the seismic behaviour of modern existing structures, not designed to withstand seismic actions. The buildings were modelled using an equivalent-frame approach, adopting, and comparing two nonlinear constitutive laws and introducing specific modelling strategies to represent the distinctive features of modern existing URM structures. Nonlinear static analyses were performed to determine capacity and multi-stripe time history analyses to evaluate displacement demand at increasing return periods. Although non-exhaustive, the results show a trend of generally decreasing seismic vulnerability for more recent buildings. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Typological seismic fragility assessment of old railway stations by nonlinear time history analysis.

Author

Rota, M., Bracchi, S., Iorio, D., and Penna, A.

Subjects
*EARTHQUAKE hazard analysis, *RAILROAD stations, *NONLINEAR analysis, *CONSTRUCTION materials, *NINETEENTH century
Abstract

The homogeneity of standard Italian railway stations in terms of period of construction (second half of the 19th century), architectural and structural features, typical dimensions and morphology (mostly depending on expected number of passengers) allows the identification of building typologies, with an expected similar behaviour under seismic actions. Four typologies of standard railway stations were identified and, for each of them, variability in building geometry and material parameters was accounted for. Fragility curves were then derived by means of multi-stripe nonlinear dynamic analyses on equivalent-frame 3D macroelement models of the structures, for appropriately selected limit states. The results obtained can be very useful for assessing the seismic vulnerability of this kind of structures, whose seismic behaviour is of strategic importance, both for the potentially high number of victims and for the need of keeping railway lines operational in the aftermath of a seismic event. Also, the results presented in this study could be useful to set prioritization schemes of retrofitting interventions, starting from the identification of the stations most at risk, by combining fragility curves and seismic hazard information. [ABSTRACT FROM AUTHOR]

Published
2021
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10. The implicit risk of code-conforming structures in Italy

Author

Bazzurro P., Bellotti D., Bracchi S., Camata G., Camilletti D., Cattari S., Cardone D., Celano F., Cimmino M., Conte N., Ercolino M., Dall'Asta A., da Porto F., Della Corte G., De Sanctis L., Di Cesare A., Flora A., Franchin P., Guidi G., Iervolino I., Lagomarsino S., Landolfo R., Leccese G., Magenes G., Magliulo G., Manfredi V., Mandirola M., Manzini C. F., Masi A., Micozzi F., Modena C., Mollaioli F., Nascimbene R., Noto F., Penna A., Petrone C., Ponzo F., Ragni L., Ricci P., Rota M., Scozzese F., Spacone E., Spillatura A., Suzuki A., Terracciano G., Terrenzi M., Verderame G. M., Zona A., I. Iervolino, Bazzurro, P., Bellotti, D., Bracchi, S., Camata, G., Camilletti, D., Cattari, S., Cardone, D., Celano, F., Cimmino, M., Conte, N., Ercolino, M., Dall'Asta, A., da Porto, F., Della Corte, G., De Sanctis, L., Di Cesare, A., Flora, A., Franchin, P., Guidi, G., Iervolino, I., Lagomarsino, S., Landolfo, R., Leccese, G., Magenes, G., Magliulo, G., Manfredi, V., Mandirola, M., Manzini, C. F., Masi, A., Micozzi, F., Modena, C., Mollaioli, F., Nascimbene, R., Noto, F., Penna, A., Petrone, C., Ponzo, F., Ragni, L., Ricci, P., Rota, M., Scozzese, F., Spacone, E., Spillatura, A., Suzuki, A., Terracciano, G., Terrenzi, M., Verderame, G. M., and Zona, A.

Abstract

This book is the 2015-2017 report of the RINTC project, which has been a joint project of ReLUIS and EUCENTRE. The project intended to assess the seismic risk of code conforming structures in Italy. The results presented herein are, in some cases, different from those presented in the previous years and from preliminary literature derived from this project. This is because, as discussed in the body of text, hypotheses and choices have been continuously revised until consolidation; this process might be continuing even after the end of the project. In general, all computed annual structural failure rates closely reflect specific assumptions on design, modeling and analysis of the considered structures, and this has to be always taken into account when discussing the results of this project. The working group of the project (listed below) consists of the following six sub-groups, each of which explores (i) seismic risk assessment of code-conforming structures, designs, modelling, and analyses of (ii) masonry buildings, (iii) precast reinforced concrete buildings, (iv) reinforced concrete buildings, (v) steel buildings, and (vi) base-isolated reinforced concrete buildings. The book is structured such that each chapter presents the research results from the corresponding sub-group: Chapter (i) introduces the objectives and framework of the project; Chapters (ii) ? (vi) develop code-conforming designs, modelling and analyses of buildings for each structural type; Chapter (vii) concludes the study presenting the final results of the computed failure rates for the structures examined in the preceding chapters. Moreover, readers can refer to Appendices A to C for the details of the considerations on (a) usability-preventing limit state, (b) soil-structure interaction, and (c) model-uncertainty, respectively.

Published
2018

11. Comportamento degli edifici in muratura nella sequenza sismica del 2012 in Emilia

Author

Bracchi, S., da Porto, F., Galasco, A., Graziotti, F., Liberatore, Domenico, Liberatore, Laura, Magenes, G., Mandirola, M., Manzini, C., Masiani, Renato, Morandi, P., Palmieri, M., Penna, A., Rosti, A., Rota, M., Sorrentino, Luigi, and Tondelli, M.

Subjects
Terremoto Emilia 2012, edifici in muratura, muratura in laterizio, vulnerabilità, progettazione sismica
Published
2012

13. Aquila-field project overview.

Author

Ciprigno, M., Chimisso, C., and Bracchi, S.

Subjects
OIL fields
Abstract

Provides an overview of the Aquila-field oil drilling project developed of Eni-Agip Division. Development scheme of the project; Background and management of the project.

Published
2000

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