Eνίσχυση Υφιστάμενου Κτιρίου από ΩΣ με Καινοτόμα Αντισεισμικά Συστήματα INERD

Κουνιάκη, Καλλιόπη-Μαρία; Kouniaki, Kalliopi-Maria

dc.contributor.author	Κουνιάκη, Καλλιόπη-Μαρία	el
dc.contributor.author	Kouniaki, Kalliopi-Maria	en
dc.date.accessioned	2018-01-25T11:25:32Z
dc.date.available	2018-01-25T11:25:32Z
dc.date.issued	2018-01-25
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/46314
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.7489
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Δομοστατικός Σχεδιασμός και Ανάλυση των Κατασκευών”	el
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	Ενίσχυση κτιρίου	el
dc.subject	Σκυρόδεμα	el
dc.subject	Συστήματα δυσκαμψίας	el
dc.subject	Αντισεισμικός σχεδιασμός	el
dc.subject	Συστήματα INERD	el
dc.subject	Retrofitting	en
dc.subject	Reinforced concrete	en
dc.subject	Seismic resistant	en
dc.subject	INERD dissipative system	el
dc.subject	Lateral loads	el
dc.title	Eνίσχυση Υφιστάμενου Κτιρίου από ΩΣ με Καινοτόμα Αντισεισμικά Συστήματα INERD	el
dc.title	Retrofitting of existing RC Building with Innovative dissipative INERD system	en
heal.type	masterThesis
heal.classification	Structural engineering	en
heal.classificationURI	http://skos.um.es/unesco6/330532
heal.language	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2017-10-26
heal.abstract	Αντικείμενο της εργασίας είναι η διερεύνηση της συμπεριφοράς επταώροφου κτιρίου οπλισμένου σκυροδέματος, υπό την επίδραση σεισμικών δράσεων. Δίνεται έμφαση στην μετελαστικής απόκριση του φορέα όπου αποτιμάται το μέγεθος των βλαβών που θα δεχθεί η κατασκευή με τη μέθοδο των σταθμών επιτελεστικότητας στην πιθανότητα εμφάνισης της σεισμικής δόνησης σχεδιασμού. Η απουσία αντισεισμικών απαιτήσεων κατά τον αρχικό σχεδιασμό. Τόσο για την κατασκευαστική διαμόρφωση των διατομών αλλά και την γενικότερη μόρφωση του στατικού φορέα έχουν ως συνέπεια η ενίσχυση του κτιρίου να κρίνεται ως αναγκαία. Για τον σκοπό αυτό χρησιμοποιείται το μεταλλικό σύστημα INERD ένα από τα συστήματα που αναπτύχθηκαν στα πλαίσια του κοινού Ευρωπαικού ερευνητικού προγράμματος με τίτλο «Two Innovations for Earthquake Resistant Design». To INERD συντίθεται από ένα ζεύγος εξωτερικών και ένα ζεύγος εσωτερικών μεταλλικών πλακών, που συνδέονται μεταξύ τους με ένα πείρο και τοποθετείται στα άκρα των μεταλλικών συνδέσμων δυσκαμψίας. Η απορρόφηση σεισμικής ενέργειας επιτυγχάνεται μέσω της πλαστικοποίησης των συστημάτων INERD. Αποτιμάται εκ νέου η απόκριση του ενισχυμένου φορέα, με το σύστημα να ανασχεδιάζεται εώς ότου επιτευχθεί ο στόχος της σεισμικής ικανότητας της κατασκευής.	el
heal.abstract	Reinforced Concrete buildings are the majority of structures that have been built in Greece to date. The corruption and the damages which occur with time reduce their strength capacity, while many of them haven’t been designed with the modern earthquake resistant regulations. Naturally there are many doubts regarding the seismic vulnerability of those structures and the need retrofitting in order that they can undertake significant seismic loading. The Design of buildings in areas of high seismic activity has particular requirements. The design of structures capable for receiving the loading of the strongest possible Earthquake without any damages is extremely expensive. As a result, the common Design aims to avoid any damages at the structure during an Earthquake of medium intensity and in the case of an Earthquake of high intensity damages to the structure are permitted to a certain point, avoiding the collapse of the building. According to the severity of accepted damages, three Performance levels are defined: Immediate Occupancy (IO). Life Safety (LS) and Collapse Prevention (CP). For many decades the main target of the Earthquake Resistance Design was the Life Safety Performance level, according to which after an Earthquake the non-load bearing structural elements can suffer severe damages, while load bearing structural elements even if they have entered the hardening area, are still able to transfer vertical loading safely. Common seismic lateral force resisting systems (centrically braced frames, moment-resisting frames etc.) absorb seismic energy at particular positions on the structure (structural elements or connections) reducing the extent of damages. However, in an extremely large earthquake the development of plastic hinges on load-bearing structural elements, even if prevents the partial or total collapse of the building, securing the life safety level, it can lead to permanent interstory drifts. In that case the restoration of the building could have a greater cost if comparing to its demolition and rebuild. Research is focusing at the development of new seismic resistant systems, that are capable to absorb seismic energy through their hysteretic behavior at controlled positions on the structure (connections or structural elements) which are independent to the system receiving vertical loads, so the main structure deformations occur in the elastic area. Furthermore, due to their small size, the can be repaired or replaced easily and with the appropriate design it is possible to achieve the Performance Level of Immediate Occupancy right after the earthquake. This Master Thesis aims to the retrofitting of a reinforced concrete building by implementing to its system the innovative dissipative systems INERD. This earthquake resisting systems has been developed through the research program “Two Innovations for Earthquake Resistant Design”. Firstly, it is necessary to describe the INERD pin connection. The INERD pin connection is used between the vertical brace of a building and its column, and can be realized with various layouts. The INERD connection that was used at the present thesis consists of two external plates, which are bolted to the column and two internal plates, which are welded at the end of the brace. A pin which can be rectangular, rounded or circular cross section, passes through all the plates via appropriate sized holes. The strong axis of the pin cross section can be parallel or perpendicular to the brace axis. The INERD pin connections absorb energy due to their axial deformation, Subsequently, the retrofitting of a reinforced concrete building with orthogonal layout is studied. The building consists of 7 floors at 2 basement levels, while a seismic area category I (ag=0,16) is considered. At the first 4 floors of the building an absence of beams is observed, but instead there is strengthened area around the columns. After the analysis, the capacity of receiving the vertical loads is verified, however the structure cannot receive the seismic lateral loading. As a result, it is necessary to retrofit the structure through 9 bays with Λ braces positioned at the perimeter at all levels. One INERD pin connection is used at each brace. The dimensioning of INERD pins is realized through iteration until all the seismic resistant regulations for the structure are satisfied. In order to estimate the results of the retrofit elastic and static inelastic analyses are taken into consideration. Specifically, after the implementation of INERD to the building, the structure is able to resist to seismic loading according to modern Earthquake Resistant regulations. The capacity curve of the structures shows that it can receive larger loads, while the displacements and interstory drifts are significantly reduced. For the case study of a normal earthquake the structure does not overcome the perfomance level of immediate occupancy, while in the case of a larger earthquake the Collapse of the building is prevented and at the target displacement the structure has overcome the life safety performance level. At the same scenario the existing building overcomes the collapse prevention performance level. In conclusion the use of INERD at the present building is considered successful, as it lead to the desired behavior of the structure considering the lateral seismic loading.	en
heal.advisorName	Βάγιας, Ιωάννης	el
heal.advisorName	Vayas, Ioannis	en
heal.committeeMemberName	Βάγιας, Ιωάννης	el
heal.committeeMemberName	Θανόπουλος, Παύλος	el
heal.committeeMemberName	Βαμβάτσικος, Δημήτριος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Πολιτικών Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	79 σ.	el
heal.fullTextAvailability	true