Ductile Seismic Design, Performance Assessment and Taxonomic Characterization of Steel Racking Systems

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dc.contributor.author Τσαρπαλής, Δημήτριος el
dc.contributor.author Tsarpalis, Dimitrios en
dc.date.accessioned 2022-10-13T07:45:58Z
dc.date.available 2022-10-13T07:45:58Z
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/55902
dc.identifier.uri http://dx.doi.org/10.26240/heal.ntua.23600
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 Racking systems en
dc.subject Content sliding en
dc.subject Rack taxonomy en
dc.subject Ductile seismic design en
dc.subject Seismic assessment en
dc.subject Συστήματα ραφιών el
dc.subject Ολίσθηση περιεχομένων el
dc.subject Ταξινομία ραφιών el
dc.subject Σεισμική αποτίμηση el
dc.subject Πλάστιμος σεισμικός σχεδιασμός el
dc.title Ductile Seismic Design, Performance Assessment and Taxonomic Characterization of Steel Racking Systems en
dc.title Πλάστιμος Σεισμικός Σχεδιασμός, Αποτίμηση Επιτελεστικότητας και Ταξινομικός Χαρακτηρισμός Συστημάτων Μεταλλικών Ραφιών el
dc.contributor.department Τομέας Δομοστατικής - Εργαστήριο Μεταλλικών Κατασκευών el
heal.type doctoralThesis
heal.classification Steel structures en
heal.language en
heal.access free
heal.recordProvider ntua el
heal.publicationDate 2022-05-23
heal.abstract Steel racking systems are Civil Engineering structures used to store the goods and materials of a warehousing unit. In order to facilitate the construction process and to minimize the weight of the steel members, racks are characterized by a number of peculiarities that distinguish them from ordinary buildings. Due to their loose connections and lightness, racks are flexible structures, characterized by significant geometric nonlinearities and local buckling phenomena that significantly deteriorate their lateral-loading response. Indeed, past earthquake events have revealed the vulnerability of racks against strong ground motions, underlining the need for novel design approaches in order to increase their resilience. Research so far has focused on understanding the cyclic behaviour of members and joints that belong to the most common rack configuration, namely adjustable pallet racking systems. However, in order to serve different logistic needs, a variety of rack typologies with different uses and salient characteristics has evolved over time. As a result, racks can range from large independent buildings in the form of the automated rack supported warehouses (ARSWs), down to compact sub-structures. Along these lines, the macro-characteristics of various rack typologies are discussed for the first time, identifying their idiosyncrasies and commonalities to other systems, which are then summarized in a flexible and collapsible taxonomy. In view of better understanding the behaviour of ARSWs to earthquake excitations, a comprehensive seismic assessment is conducted on five multi-depth case studies, designed by professional engineers according to the current European standards. The impact of the design assumptions on the definition of the seismic loads is highlighted and aggregated in a cumulative seismic load multiplier. Consequently, a series of linear response history analyses is performed, in order to assess the vulnerability of the ARSWs to non-ductile failure modes and to define a hierarchy of criticalities for each case study. Following the current tendency in the earthquake engineering community for resilient infrastructure, a ductile seismic design framework is proposed for the cross-aisle direction of racks, so-called plastic ovalization strategy (POS). POS relies on the bearing deformation of the diagonal bolt hole to introduce ductility and reduce seismic demands, employing capacity design to avoid non-ductile failure modes. Analytical equations and finite element models are used to determine the key factors that influence the ductility of the connection and to calibrate the uniaxial springs in a beam element model. Finally, to assess the performance of POS, two ARSWs are examined. To achieve frugal performance assessment of racking systems, a reduced-order modelling approach is proposed that replaces the entire cross-aisle frame with a single/double built-up column, equivalent Timoshenko beams or link elements. The resulting model can support 2D/3D elastic and inelastic analyses, allowing rapid structural analysis of massive racking systems. Finally, the dissertation attempts to fill a gap in the problem of content-structure-sliding interaction (CSSI), a multi-faceted phenomenon that offers both detrimental and beneficial effects to the racking structure. Three approaches are investigated to capture CSSI, each characterized by its own modelling needs and level of accuracy. Simplified alternatives are calibrated using single degree of freedom systems and realistic rack case studies, offering a reliable tool for structural engineers to (a) accurately determine the expected pallet sliding displacements, and (b) correctly reduce the design seismic loads thanks the seismic isolation mechanism offered by CSSI. en
heal.sponsor This research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning» in the context of the project “Strengthening Human Resources Research Potential via Doctorate Research” (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ). en
heal.advisorName Βάγιας, Ιωάννης el
heal.advisorName Vayas, Ioannis en
heal.committeeMemberName Vayas, Ioannis
heal.committeeMemberName Vamvatsikos, Dimitrios
heal.committeeMemberName Thanopoulos, Pavlos
heal.committeeMemberName Gantes, Charis
heal.committeeMemberName Avraam, Anastasios
heal.committeeMemberName Morelli, Francesco
heal.committeeMemberName Castiglioni, Carlo Andrea
heal.academicPublisher Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Πολιτικών Μηχανικών el
heal.academicPublisherID ntua
heal.numberOfPages 207
heal.fullTextAvailability false

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Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα Except where otherwise noted, this item's license is described as Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα