Seismic fragility assessment via non-linear analysis:
practical issues and tools for engineering applications

Baraschino, Roberto

dc.contributor.author	Baraschino, Roberto	el
dc.date.accessioned	2022-05-09T09:25:13Z
dc.date.available	2022-05-09T09:25:13Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/55120
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.22818
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Fragility function	en
dc.subject	Estimation uncertainty	en
dc.subject	Pushover analysis	en
dc.subject	Seismic reliability	en
dc.subject	Performance based earthquake engineering	en
dc.subject	Σεισμική τρωτότητα	el
dc.subject	Αβεβαιότητα εκτίμησης	el
dc.subject	Στατική μη-γραμμική	el
dc.subject	Σεισμική αξιοπιστία	el
dc.subject	Σεισμική διακινδύνευση	el
dc.title	Seismic fragility assessment via non-linear analysis: practical issues and tools for engineering applications	en
dc.title	Αποτίμηση σεισμικής τρωτότητας μέσω μη γραμμικής ανάλυσης: πρακτικά θέματα και υπολογιστικά εργαλεία εφαρμογής	el
heal.type	doctoralThesis
heal.classification	Structural engineering	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2022-03-14
heal.abstract	In the framework of performance-based earthquake engineering (PBEE) the most notable task is the problem of evaluating the rate of earthquakes leading a structure to fail in meeting a performance objective, that can be intended as a measure of seismic reliability. In one of its simplest forms this calculation includes two terms: the annual rate of earthquakes able to cause structural failure; the rate of exceeding a certain value of a ground motion intensity measure (IM); the conditional probability that structural response given a certain IM level, exceeds the performance objective threshold, the so-called fragility function. In the state-of-the-art approach, fragility can be analytically evaluated via several procedures that all require non-linear dynamic analysis of a structural numerical model subjected to set of ground motions. The main disadvantages of the dynamic-analysis-based derivation of fragility functions is the computational burden involved and the amount of effort that has to go into modelling highly non-linear structural behaviour so that engineers find themselves strongly motivated to look for approximate alternatives and for such reasons due tools have been developed. First one is SPO2FRAG, an application coded in MATLAB® environment that permits the computer-aided evaluation of seismic fragility functions for buildings, based on the results of static non-linear-analysis. Second tool is DYANAS, a MATHWORKS MATLAB®-based graphical user interface that expedites the definition of inelastic SDOF systems in the OpenSees finite element platform, streamlines the execution of dynamic analyses under suites of base-acceleration time histories and allows for methodical processing of the final results. Both terms needed for seismic reliability assessment can be affected by so-called estimation uncertainty, since both functions have to be deduced from available and limited data. For such reason the tool R2R-EU was developed in MATLAB with a dual purpose: (i) estimating structure-specific seismic fragility, based on dynamic analysis, and (ii) quantifying estimation uncertainty, emanating specifically from record-to-record variability of seismic structural response, and the extent to which that uncertainty propagates unto risk metrics, such as the failure rate Concept of estimation uncertainty has been then used to investigate the record sample size required to achieve quantifiable levels of mean relative estimation error on seismic risk metrics. The mean relative estimation error depends on both the dispersion of structural responses and the shape of the 2 hazard curve at the site, This dependence was shown to hold in the context of Cornell’s reliability method and of fragility functions derived via the so-called intensity-based approach. Finally, fragility curves were assessed for the buildings designed within the RINTC project. The study provides the seismic fragility curves for codeconforming Italian buildings analysed in the RITNC project. Lognormal fragilities refer to global collapse failure and usability preventing damage, which are the performances considered in the project, and are derived via stateof- the-art methods and include consideration of the uncertainty in the estimation of their parameters. The curves are made available to be possibly used for further risk analyses, and also enable a discussion of the fragility fitting issues as a function on the site’s hazard.	en
heal.advisorName	Βαμβατσίκος, Δημήτριος	el
heal.advisorName	Vamvatsikos, Dimitrios	en
heal.advisorName	Lervolino, Iunio	en
heal.committeeMemberName	Vamvatsikos, Dimitrios	en
heal.committeeMemberName	Βαμβατσίκος, Δημήτριος	el
heal.committeeMemberName	Iervolino, Iunio	en
heal.committeeMemberName	Fragiadakis, Michalis	en
heal.committeeMemberName	Φραγκιαδάκης, Μιχαήλ	el
heal.committeeMemberName	Landolfo, Raffaele	en
heal.committeeMemberName	Baltzopoulos, Georgios	en
heal.committeeMemberName	Μπαλτζόπουλος, Γεώργιος	el
heal.committeeMemberName	Thanopoulos, Pavlos	en
heal.committeeMemberName	Θανόπουλος, Παύλος	el
heal.committeeMemberName	Gantes, Charis	en
heal.committeeMemberName	Γαντές, Χάρης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Πολιτικών Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	228 p.	en
heal.fullTextAvailability	false
heal.fullTextAvailability	false