diplomska naloga
Nina Milikič (Avtor), Vlatko Bosiljkov (Mentor), Janko Logar (Član komisije za zagovor), Jože Panjan (Član komisije za zagovor), Igor Planinc (Član komisije za zagovor), Meta Kržan (Komentor)

Povzetek

Analiza potresne odpornosti gradu Grm glede na različne ravni poznavanja konstrukcije

Ključne besede

gradbeništvo;diplomska naloga;UNI;grad Grm;potresna odpornost;nelinearna statična analiza;programsko orodje 3Muri;obnova kulturne dediščine;materialne karakteristike;ravni poznavanja konstrukcije;podajni stropovi;

Podatki

Jezik: Slovenski jezik
Leto izida:
Izvor: Ljubljana
Tipologija: 2.11 - Diplomsko delo
Organizacija: UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik: Nina Milikič
UDK: 624.042.7:728.81(497.4)(043.2)
COBISS: 6547297 Povezava se bo odprla v novem oknu
Št. ogledov: 2751
Št. prenosov: 736
Ocena: 0 (0 glasov)
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Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Seismic assessment of the Grm castle considering different knowledge levels of the structure
Sekundarni povzetek: In the present Graduation thesis, seismic resistance of the Grm castle is evaluated. At the time of the castle's construction, lateral loads were not considered. Consequently, earthquakes can cause significant damage to historical buildings. Furthermore, degradation of material, visible damages and cracks on structural elements, numerous rebuildings during its use, and new conditions of use result in a need to structurally retrofit the building. In existing masonry structures, floors are usually flexible. The 3Muri software, developed at the University of Genova, was used in the seismic assessment of the castle. 3Muri performs nonlinear pushover static analysis. Two types of structures were modelled, one with flexible floors and the other with rigid floors. Regarding material properties, no appropriate experimental tests on building materials were carried out. The material properties in model were adopted from two different sources: from the Italian national technical code (NTC, 2008) and from an investigation of a similar building in Slovenia. Considering uncertainties related to the characteristics of the constituent materials, various knowledge levels were adopted. A higher knowledge level is reflected in a lower reduction factor for material properties, and consenquently, better material properties result in higher seismic resistance of the building. Comparing models with lowest and highest knowledge levels, results can vary up to 30% in terms of peak ground acceleration. An exhaustive preliminary investigation of the structure's characteristics is therefore of great importance. As expected, the resistance of a structure with rigid floors is greater than the one with flexible floors. In the past, a common repairing technique used in historical buildings was substitution of flexible floors with rigid concrete floors. As this is no longer a practice, modelling this type of buildings by means of methods based on storey mechanism and rigid diaphragms, is questionable. On the other hand, new methods, such as the equivalent frame method, seem not to give completely reliable results in some cases with flexible floors.
Sekundarne ključne besede: graduation thesis;Grm castle;seismic resistance;nonlinear static analysis;3Muri numerical tool;rehabilitation of heritage buildings;material properties;knowledge levels of the structure;flexible floors;
Vrsta datoteke: application/pdf
Vrsta dela (COBISS): Diplomsko delo
Komentar na gradivo: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani: XII, 87 str., 3 pril.
Vrsta dela (ePrints): thesis
Naslov (ePrints): Analiza potresne odpornosti gradu Grm glede na različne ravni poznavanja konstrukcije
Ključne besede (ePrints): grad Grm;potresna odpornost;nelinearna statična analiza;programsko orodje 3Muri;obnova kulturne dediščine;materialne karakteristike;ravni poznavanja konstrukcije;podajni stropovi
Ključne besede (ePrints, sekundarni jezik): Grm castle;seismic resistance;nonlinear static analysis;3Muri numerical tool;rehabilitation of heritage buildings;material properties;knowledge levels of the structure;flexible floors
Povzetek (ePrints): V diplomski nalogi je analizirana potresna odpornost gradu Grm. Stavbe kulturne dediščine običajno najbolj prizadene potres, saj v času izgradnje objekta horizontalne obremenitve konstrukcije niso bile upoštevane. Poleg potresa pa so propadanje materiala, razvoj poškodb na nosilni konstrukciji, številne predelave skozi uporabo in navsezadnje nove potrebe uporabnikov vzroki za temeljitejšo obnovo gradu. Posebnost starih stavb so podajni stropovi. Za analizo objekta je bil uporabljen program 3Muri, razvit na Univerzi v Genovi, ki za račun odpornosti konstrukcije izvede nelinearno statično analizo. Analizirana sta bila dva različna modela konstrukcije, in sicer eden s podajnimi stropovi in drugi s togimi. Na objektu ni bilo opravljenih ustreznih preiskav zidov, zato so bile vrednosti materialnih karakteristik privzete iz dveh različnih virov, in sicer iz italijanskih standardov (NTC, 2008) in iz preiskav podobnega objekta v Sloveniji. Zaradi negotovosti glede materialnih karakteristik in nepoznavanja detajlov nosilne konstrukcije so bili predpostavljeni različni nivoji poznavanja konstrukcije, skladno s standardi. Višji nivo poznavanja konstrukcije pomeni manjšo redukcijo mehanskih lastnosti materialov. Analize so pokazale, da se lahko pri spremembi ravni poznavanja konstrukcije z najslabše stopnje na najboljšo potresna odpornost stavbe v smislu pospeška, ki ga je konstrukcija sposobna prenesti, izboljša celo do 30%. Dobro poznavanje lastnosti obstoječega objekta je zato ključnega pomena, saj lahko majhne razlike pri vhodnih podatkih pomenijo velike razlike pri rezultatih. Pričakovano je odpornost konstrukcije s togimi stropovi boljša od tiste s podajnimi. V današnji praksi v starih stavbah podajnih stropov ne nadomeščamo več s togimi betonskimi, zato je primernost programov, ki delujejo na podlagi etažnega mehanizma in upoštevajo toge diafragme, vprašljiva. Hkrati pa sodobnejša metoda, kot je prevedba makroelementov na ekvivalenten okvir, v nekaterih primerih za podajne stropove ne da povsem zanesljivih rezultatov.
Povzetek (ePrints, sekundarni jezik): In the present Graduation thesis, seismic resistance of the Grm castle is evaluated. At the time of the castle's construction, lateral loads were not considered. Consequently, earthquakes can cause significant damage to historical buildings. Furthermore, degradation of material, visible damages and cracks on structural elements, numerous rebuildings during its use, and new conditions of use result in a need to structurally retrofit the building. In existing masonry structures, floors are usually flexible. The 3Muri software, developed at the University of Genova, was used in the seismic assessment of the castle. 3Muri performs nonlinear pushover static analysis. Two types of structures were modelled, one with flexible floors and the other with rigid floors. Regarding material properties, no appropriate experimental tests on building materials were carried out. The material properties in model were adopted from two different sources: from the Italian national technical code (NTC, 2008) and from an investigation of a similar building in Slovenia. Considering uncertainties related to the characteristics of the constituent materials, various knowledge levels were adopted. A higher knowledge level is reflected in a lower reduction factor for material properties, and consenquently, better material properties result in higher seismic resistance of the building. Comparing models with lowest and highest knowledge levels, results can vary up to 30% in terms of peak ground acceleration. An exhaustive preliminary investigation of the structure's characteristics is therefore of great importance. As expected, the resistance of a structure with rigid floors is greater than the one with flexible floors. In the past, a common repairing technique used in historical buildings was substitution of flexible floors with rigid concrete floors. As this is no longer a practice, modelling this type of buildings by means of methods based on storey mechanism and rigid diaphragms, is questionable. On the other hand, new methods, such as the equivalent frame method, seem not to give completely reliable results in some cases with flexible floors.
Ključne besede (ePrints, sekundarni jezik): Grm castle;seismic resistance;nonlinear static analysis;3Muri numerical tool;rehabilitation of heritage buildings;material properties;knowledge levels of the structure;flexible floors
ID: 8327190