482 research outputs found
Vulnerabilità sismica, danneggiamento e proposte di intervento di edifici storici in muratura in Emilia Romagna
No full textLe strutture in muratura caratterizzano il costruito emiliano e in muratura sono i suoi più significativi edifici storici. Il terremoto che ha colpito l’Emilia il 20 e 29 Maggio ne ha messo in evidenza le vulnerabilità. Lo scopo della presente tesi è l’analisi sismica di alcuni edifici storici in muratura danneggiati dal terremoto. La vulnerabilità delle strutture in muratura viene studiata in dettaglio grazie all’osservazione dei danni e alle analisi svolte con modelli ad elementi finiti. I casi studio esaminati sono: - La Torre Fornasini, localizzata a Poggio Renatico [1]; - Una struttura in muratura monumentale chiamata Prospettiva [2] [3] [4] [5]; - La volta a crociera presente nella torre maestra della rocca di San Felice sul Panaro [6]; - Palazzo Naselli Crispi, uno dei più importanti palazzi rinascimentali nella città di Ferrara.
La simulazione e interpretazione del comportamento simico di queste strutture è svolta con analisi non lineari e diversi tipi di modellazione ed ha preso in considerazione lo stato di fatto dei manufatti, il loro stato di danno e gli interventi di progetto. Particolare attenzione è stata rivolta alle strutture voltate a crociera, per esse numerose simulazioni sono state svolte variando le condizioni al contorno, le proprietà dei materiali, il riempimento e la presenza di rinforzi in FRP [7].
[1] Cattari S., Lagomarsino S., Milani G., Rossi M., Simoni M., Tralli A.: Non linear modelling of fornasini tower after the 2012 emilia earthquake (italy). - Mexico City : SACH 2014 - 9th international Conference on Structural Analysis of Historical Construction, 2014. [2] Chiozzi A., Malagù M., Tralli A., Cazzani A.: ArchNURBS: NURBS-Based Tool for the Structural Safety Assessment of Masonry Arches in MATLAB. - [s.l.] : J. Comput. Civ. Eng. 10.1061/(ASCE)CP.1943-5487.0000481 , 04015010., 2015. - Vol. 30. [3] Chiozzi A., Simoni M. and Tralli A. Base isolation of heavy non-structural monolithic object at the top of masonry monumental construction. - [s.l.] : Materials and Structures, 2015.
[4] Chiozzi A., Simoni M. and Tralli A. Rocking and overturing prevention for non-structural monolithic objects under seismic excitations through base isolation: a case study in Ferrara (Italy). - Florence : 5th European Conference of civil Engineering, 2014. [5] Chiozzi A., Simoni M. and Tralli A. Safety assessment and base isolation of heavy non-structural monolithic object. - Guwahaiti-India : 12th International conference on vibration problems, 2015. [6] Cattari S. [et al.] Vulnerabilità delle Rocche e dei Castelli Emiliani Danneggiati dal Sisma del Maggio 2012: Abaco dei principali meccanismi di danno.. - [s.l.] : Castellum n°55, 2014. [7] Milani G., Simoni M. and Tralli A. Advanced numerical models for the analysis of masonry cross vaults: a case study in italy. - [s.l.] : Engineering Structures, 2014. - Vols. 76, pp. 339-358.The masonry structures are a very common and distinctive type among the Emilian historical construction and the earthquake of May 20th and 29th, 2012 highlighted their high vulnerability. Aim of the present thesis is the analysis of a series of existing masonry construction damaged by earthquake. Thus the seismic vulnerability of the masonry constructions is studied and deepened, based on an accurate damage assessment and analyses on finite element models of typical configurations, in terms of geometrical and constructive features. The cases study presented are: - Fornasini tower, located in Poggio Renatico [1]; - A masonry monumental construction named Prospettiva [2] [3] [4] [5]; - The cross vault in the main tower of Fortress located in San Felice sul Panaro [6], - Naselli Crispi, one of the most important Renaissance masonry buildings in the city of Ferrara. To simulate and interpret its seismic response, non linear numerical simulations are performed by using in an integrated way various modelling approaches. The seismic response of those are described in reference to their historical notes, the damage and their post seismic structural interventions. Particularly, great attention has been devoted to cross masonry vault for which several numerical simulation are performed varying constraint conditions, material properties, infill modeling and presence of FRP strips as reinforcement devices [7].
[1] Cattari S., Lagomarsino S., Milani G., Rossi M., Simoni M., Tralli A.: Non linear modelling of fornasini tower after the 2012 emilia earthquake (italy). - Mexico City : SACH 2014 - 9th international Conference on Structural Analysis of Historical Construction, 2014. [2] Chiozzi A., Malagù M., Tralli A., Cazzani A.: ArchNURBS: NURBS-Based Tool for the Structural Safety Assessment of Masonry Arches in MATLAB. - [s.l.] : J. Comput. Civ. Eng. 10.1061/(ASCE)CP.1943-5487.0000481 , 04015010., 2015. - Vol. 30. [3] Chiozzi A., Simoni M. and Tralli A. Base isolation of heavy non-structural monolithic object at the top of masonry monumental construction. - [s.l.] : Materials and Structures, 2015.
[4] Chiozzi A., Simoni M. and Tralli A. Rocking and overturing prevention for non-structural monolithic objects under seismic excitations through base isolation: a case study in Ferrara (Italy). - Florence : 5th European Conference of civil Engineering, 2014. [5] Chiozzi A., Simoni M. and Tralli A. Safety assessment and base isolation of heavy non-structural monolithic object. - Guwahaiti-India : 12th International conference on vibration problems, 2015. [6] Cattari S. [et al.] Vulnerabilità delle Rocche e dei Castelli Emiliani Danneggiati dal Sisma del Maggio 2012: Abaco dei principali meccanismi di danno.. - [s.l.] : Castellum n°55, 2014. [7] Milani G., Simoni M. and Tralli A. Advanced numerical models for the analysis of masonry cross vaults: a case study in italy. - [s.l.] : Engineering Structures, 2014. - Vols. 76, pp. 339-358
On Safety Assessment and Base Isolation of Heavy Non-structural Monolithic Objects
No full textAbstractUnder seismic actions heavy non-structural objects, which are usually placed at the top of existing constructions, may constitute a danger to human lives and a considerable loss for world heritage. In this contribution, safety assessment of non-structural monolithic objects is discussed through the illustration of a case study, which concerns seismic protection of eleven ancient marble decorative pinnacles placed at the top of a three-arched masonry city gate in Ferrara (ITALY). A method for assessing the safety of the underlying masonry structure under the action of seismic excitations is outlined and the amplification of the ground motions due to the presence of such structure is evaluated
Approaches to Innovation: Exploitation or Exploration? A Simulation Study
No full textThis study attempts to explore how firms’ productive opportunity and performance evolve differently under different assumptions of firms’ motivation and propensity to explore new technology, given the characteristics of the demand. On the one hand, exploiting existing competencies may provide short-term success, but competence exploration can become a hindrance to the firm’s long-term viability. On the other hand, deploying resource combinations as to an externally focused search inherently mitigates the risk of failure, while deploying resource combination as to an internally focused search may dramatically enlarge the set of all possible deployments that are within someone’s ability and means to execute. A computational model using agent-based simulation techniques is proposed. The results of the computational model suggest that the degree of heterogeneity of the market strongly affects the performances achievable through different strategic approaches
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