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Ocena potresne odpornosti zidane stavbe iz porobetona : diplomska naloga
Ivančič, Jera (Author), Dolšek, Matjaž (Mentor) More about this mentor... This link opens in a new window, Snoj, Jure (Co-mentor)

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Abstract
V diplomski nalogi je predstavljena ocena potresne odpornosti obstoječe zidane stavbe iz porobetonskih blokov na območju Bloške planote, zgrajene leta 1989. V prvem delu je opisan postopek določitve projektnih potresnih sil po metodi s horizontalnimi silami in postopek za določitev nosilnosti posameznih zidov z upoštevanjem mehanizmov strižne porušitve z zdrsom, porušitve zaradi nastanka diagonalnih razpok in upogibne porušitve zidu. V drugem delu diplomske naloge je predstavljena potresna analiza izbranega objekta s pomočjo programa ETABS. Pritličje objekta smo analizirali z linijskim in ploskovnim modelom ter dobljene obremenitve uporabili za oceno potresne odpornosti elementov v dveh glavnih smereh konstrukcije. Projektne potresne sile so bile določene z upoštevanjem faktorja obnašanja 2 in ustrezajo največji vrednosti pospeška iz projektnega spektra pospeškov. Za vsak posamezen element smo določili minimalno nosilnost in iz rezultatov ocenili globalno odpornost celotne konstrukcije. Poleg analize dveh različnih modelov konstrukcije smo zaradi nepoznavanja materialnih lastnosti zidovja analizirali tudi vpliv dveh različnih trdnostnih razredov zidovja na potresno odpornost konstrukcije. Za najboljšo oceno trdnosti smo izbrali srednje vrednosti lastnosti porobetonskih zidakov iz literature, ki smo jih zmanjšali za faktor zaupanja. Po upoštevanih predpisih iz standardov Evrokod 6 in Evrokod 8 se izkaže, da konstrukcija ni sposobna prevzeti nastale potresne obremenitve, saj ta na določenih mestih prekorači nosilnosti zidov. Za natančnejšo oceno poškodovanosti objekta bi morali uporabiti nelinearne metode izračuna. Ocenjujemo, da bi se objekt pri močnem potresu lahko precej poškodoval, vendar je malo verjetno, da bi se porušil.

Language:Slovenian
Keywords:zidana stavba, potresna odpornost konstrukcije, potresna analiza, modeli nosilnosti zidovja, ETABS, ploskovni model, linijski model, metoda s horizontalnimi silami
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2017
Publisher:[J. Ivančič]
UDC:624.042.7:699.841(043.2)
COBISS.SI-ID:8124513 This link opens in a new window
Views:1456
Downloads:544
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Secondary language

Language:English
Title:Evaluation of earthqake resistance of a masonry building made from autoclaved aerated concrete blocks : Graduation thesis
Abstract:
The thesis presents an evaluation of earthquake resistance of a masonry building made from autoclaved aerated concrete blocks. The investigated family house was built in 1989 and is located in Bloke Plateau. The calculation of design seismic forces by using the method of horizontal forces and the models of strength of masonry walls for sliding shear failure, failure due to formation of diagonal cracks as well as flexural failure, are described in the first part of the thesis. The second part presents seismic analysis of the investigated building. All analyses were done by program ETABS by modelling only ground storey of the building. The basic model consisted of beam/column elements. For comparison, a shell model was also analysed. The calculated internal forces were used to check the resistance of walls independently in the two principal directions of the building. Design seismic forces were determined with consideration of behaviour factor equal to 2 and corresponds to the maximum acceleration from design acceleration spectrum. The seismic demand was compared to the estimated resistance of each wall as well as for the entire building. In addition to the consideration of two structural models, the effects of two different strength classes of walls on the earthquake resistance of the building were estimated due to uncertainty associated with the material properties of the masonry walls. We used the mean strength of autoclaved aerated concrete blocks from literature, which were reduced by a confidence factor. According to the requirements from standards Eurocode 6 and Eurocode 8 results showed that the structure is not able to withstand the resulting seismic loads, since the design value of seismic demand exceeds resistance in multiple walls. More details about the damage of the investigated building could be obtained by using nonlinear methods of analysis. In the case of strong earthquake, the significant damage in the walls is anticipated but it is not likely that the collapse would occur.

Keywords:masonry building, earthquake resistance of buildings, seismic analysis, strength models of masonry walls, ETABS, shell model, beam/column model, method of horizontal forces

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