The paper presents a research study concerning some critical issues related to the seismic modelling and analysis of typical existing RC buildings in Southern Italy. When speaking of existing buildings, first important issue is represented by the reliable appraisal of the parameters involved in the structural modelling, such as the concrete mechanical strength. It is evident that a correct assessment is crucial for obtaining an effective structural model in the elastic and inelastic field. Another key point is the choice of the proper method of analysis, since in some cases the standard methods proposed by European Codes are not effective in order to evaluate the structural behaviour of existing buildings. In order to investigate the effects of these aspects on the structural response, extensive comparisons have been performed on different structural models, obtained by properly varying the concrete strength value and by considering also a possible inhomogeneous distribution of the concrete class at different floors. Considering the specific framework of irregular buildings, analyses and consequent discussions have been performed by comparing conventional and multimodal pushover analyses and nonlinear incremental dynamic analyses.

L'articolo presenta uno studio nell'ambito delle possibili problematiche che caratterizzano le fasi di modellazione e analisi sismica di tipici edifici esistenti in calcestruzzo armato del sud Italia. A tal riguardo, un primo problema riguarda la caratterizzazione dei parametri meccanici dei materiali in situ, con particolare attenzione alla determinazione della resistenza a compressione del calcestruzzo. É evidente come una corretta valutazione di tale parametro sia fondamentale nello studio della riposta strutturale sia in campo elastico che inelastico, mediante l'uso di un adeguato modello numerico strutturale. Un altro punto fondamentale riguarda la scelta del corretto metodo di analisi sismica, considerando che i metodi standardizzati proposti dai codici Europei e nazionali presentano dei limiti, o comunque in alcuni casi forniscono risposte strutturali poco attendibili. Al fine di analizzare i sopra menzionati aspetti, l'articolo propone un'analisi di sensibilità della risposta strutturale di un edificio scolastico esistente, dovuta ad una disomogenea distribuzione delle resistenze caratteristiche del calcestruzzo fornite dalle prove strutturali, variando in primis tale parametro per tutto l'edificio e successivamente piano per piano. Inoltre, considerando l'edificio come irregolare dal punto di vista delle proprietà dinamiche, viene fornita una comparazione dei risultati ottenuti da analisi statiche non lineari convenzionali e non convenzionali, oltre che da analisi dinamiche non lineari incrementali.

Seismic assessment of irregular existing building: Appraisal of the influence of compressive strength variation by means of nonlinear conventional and multimodal static analysis / Porco, Francesco; Ruggieri, Sergio; Uva, Giuseppina. - In: INGEGNERIA SISMICA. - ISSN 0393-1420. - STAMPA. - 35:3(2018), pp. 64-86.

Seismic assessment of irregular existing building: Appraisal of the influence of compressive strength variation by means of nonlinear conventional and multimodal static analysis

Francesco Porco;Sergio Ruggieri;Giuseppina Uva
2018-01-01

Abstract

The paper presents a research study concerning some critical issues related to the seismic modelling and analysis of typical existing RC buildings in Southern Italy. When speaking of existing buildings, first important issue is represented by the reliable appraisal of the parameters involved in the structural modelling, such as the concrete mechanical strength. It is evident that a correct assessment is crucial for obtaining an effective structural model in the elastic and inelastic field. Another key point is the choice of the proper method of analysis, since in some cases the standard methods proposed by European Codes are not effective in order to evaluate the structural behaviour of existing buildings. In order to investigate the effects of these aspects on the structural response, extensive comparisons have been performed on different structural models, obtained by properly varying the concrete strength value and by considering also a possible inhomogeneous distribution of the concrete class at different floors. Considering the specific framework of irregular buildings, analyses and consequent discussions have been performed by comparing conventional and multimodal pushover analyses and nonlinear incremental dynamic analyses.
2018
Seismic assessment of irregular existing building: Appraisal of the influence of compressive strength variation by means of nonlinear conventional and multimodal static analysis / Porco, Francesco; Ruggieri, Sergio; Uva, Giuseppina. - In: INGEGNERIA SISMICA. - ISSN 0393-1420. - STAMPA. - 35:3(2018), pp. 64-86.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/148102
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