Βελτιστοποιημένος σχεδιασμός μεταλλικών κατασκευών υπό σεισμικά φορτία.

Ζαχαρενάκη, Αθανασία

dc.contributor.author	Ζαχαρενάκη, Αθανασία	el
dc.date.accessioned	2014-11-05T11:01:44Z
dc.date.available	2014-11-05T11:01:44Z
dc.date.issued	2014-11-05
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/39500
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.1386
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc/3.0/gr/	*
dc.subject	Βέλτιστος σχεδιασμός με ντετερμινιστικά κριτήρια, Βελτιστος σχεδιασμός με πιθανοτικά κριτήρια, μεταλλικές κατασκευές, κλιμάκωση καταγραφών, Προσαυξητική Δυναμική Ανάλυση, Μέση ετήσια συχνότητα	el
dc.subject	Deterministic-based structural optimization, Reliability-based structural optimization, steel structures, scaling of records, Incremental Dynamic analysis, mean annual frequency	en
dc.title	Βελτιστοποιημένος σχεδιασμός μεταλλικών κατασκευών υπό σεισμικά φορτία.	el
dc.title	Optimized design of steel structures under seismic loading	en
dc.contributor.department	Εργαστήριο Στατικής και Αντισεισμικών Ερευνών	el
heal.type	doctoralThesis
heal.classification	Βελτιστοποίηση μεταλλικών κατασκευών	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2014-09-23
heal.abstract	This dissertation has two goals; first goal is the examination of the accuracy of the incremental dynamic analysis (IDA) method and secondly to investigate the practicality of using of IDA within a structural optimization procedure. Incremental dynamic analysis involves a series of nonlinear response history analyses with a suite of incrementally scaled ground motion records. Although IDA is perhaps the most comprehensive seismic performance assessment method, it receives criticism because several ground motion records are scaled up until structural collapse. The scaling practice often results to unrealistic multipliers, -which modify the amplitude of the ground motion and introduce bias on the structural performance estimation. Record scaling is a common practice in earthquake engineering due to the lack of natural records corresponding to large magnitudes and/or small distances from the fault rupture location. In this study we use a large number of ground motion records to compare the predictions of IDA with that of unscaled ground motions and we propose a new methodology in order to quantify the bias introduced in IDA. Apart from natural records, we have conducted broadband ground motion simulations for rupture scenarios of weak, medium and large magnitude events in order to expand our record database. The investigation is performed on a series of inelastic single-degree-of-freedom systems and on two multistorey steel moment frame buildings. The results pinpoint both qualitatively and quantitatively, for the full range of limit-states, the bias that IDA introduces on the structural performance estimation. Furthermore, an algorithm is presented for the reliability-based seismic design of structures incorporating approximate performance estimation methods and structural optimization. The proposed algorithm allows the automatic optimized design of steel moment-resisting frames using reliability-based criteria and more specifically design criteria based on the mean annual frequency (MAF) that a limit-state is exceeded. Such criteria allow setting constraints with a clear engineering meaning and help to obtain building designs of improved performance and reduced cost. In this dissertation, we propose a simplified approach that allows a quick calculation of the limit-state mean annual frequencies without significant loss of accuracy. More specifically, we use the static-pushover-to-incremental-dynamic-analysis (SPO2IDA) method, which is a fast and accurate method to estimate the seismic demand and capacity of single-degree of freedom systems and first-mode-dominated multi-degree-of-freedom systems in regions ranging from near-elastic to global collapse. SPO2IDA extracts information from the static pushover curve and produces estimates of the limit-state response statistics that are necessary to implement the reliability-based criteria on the limit-state MAF. The optimization problem at hand is solved with a specifically tailored genetic algorithm. A three and a nine-storey steel moment-resisting frame are used to demonstrate the efficiency of the proposed procedure, leading to efficient building designs within reasonable computing time.	en
heal.advisorName	Παπαδρακάκης, Μανόλης	el
heal.advisorName	Γαντές, Χαράλαμπος	el
heal.advisorName	Σπηλιόπουλος, Κωνσταντίνος	el
heal.committeeMemberName	Παπαδρακάκης, Μανόλης	el
heal.committeeMemberName	Γαντές, Χαράλαμπος	el
heal.committeeMemberName	Σπηλιόπουλος, Κωνσταντίνος	el
heal.academicPublisher	Σχολή Πολιτικών Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	285
heal.fullTextAvailability	true