Ocena potresne odpornosti stavbe UL FGG na Hajdrihovi ulici s programoma 3Muri in SAP2000 : diplomska naloga

Siebenreich, Neva (author), Bosiljkov, Vlatko (mentor), Antolinc, David (comentor)

V diplomski nalogi je bila izdelana ocena potresne odpornosti institutskega trakta stavbe UL FGG na Hajdrihovi ulici v Ljubljani s programoma 3Muri in SAP2000. V začetnem poglavju obravnavamo obnašanje zidanih konstrukcij med potresom in možne porušne mehanizme. Sledita opis določil Evrokoda 8-3, ki obravnava področje ocenjevanja obnašanja obstoječih stavb med potresi, ter opis postopka preverjanja potresne odpornosti zidov. V nadaljevanju je opisana poenostavljena nelinearna N2 metoda. V praktičnem delu naloge je predstavljen obravnavan objekt. Za dosego čim bolj primerljivih rezultatov modelov v obeh programih smo se z modeliranjem v SAP-u želeli čim bolj približati modelu v 3Muriju. Analiza lastnega nihanja je bila preverjena na treh modelih – modelu v 3Muriju, linijskem modelu v SAP-u ter ploskovnem modelu v SAP-u. Pri primerjavi nihajnih časov se je izkazalo, da modela v SAP-u dosežeta zgolj 67–96 % nihajnih časov modela v 3Muriju. Razlike smo pripisali različnemu podajanju masnih vztrajnostnih momentov, da bi njihov vpliv preverili, pa smo izvedli parametrično analizo. Izkaže se, da bi primerljive rezultate obeh programov dosegli s povečanjem masnih momentov v SAP-u na 220 % njihove začetne vrednosti, česar pa s fizikalno utemeljenim argumentom ne moremo upravičiti. Rezultati obenem kažejo, da sta modela v SAP-u med seboj bolj primerljiva, kot sta primerljiva posamezen model v SAP-u in model v 3Muriju. To smo pripisali uporabi različnih metod izračuna – SAP uporablja metodo FEM, 3Muri pa metodo FME. Da bi v čim večji meri eliminirali razlike med modeloma v različnih programih, smo kontrolo enakosti delovanja programov izvedli še na primeru enostavne konstrukcije brez odprtin. Izkaže se, da odstopanja res niso posledica različno definiranih elementov konstrukcije v obeh programih, zato se zdi pripis razlik različnim metodam izračuna smiseln. V nadaljevanju smo z obema programoma izvedli še nelinearno statično »pushover« analizo, pri čemer smo v SAP-u materialno nelinearnost zajeli z uvedbo plastičnih členkov. Ponovno se izkaže, da modela v različnih programih ne izkazujeta primerljivih rezultatov.

• Language: Slovenian
• Keywords: gradbeništvo, UNI, dipl., zidana konstrukcija, kulturna dediščina, mehanske lastnosti zidovja, nelineana statična "pushover" analiza, program 3Muri, program SAP2000, N2 metoda, ocena potresne odpornosti
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [N.Siebenreich]
• Year: 2015
• Number of pages: XX, 163 str., 4 pril.
• PID: 20.500.12556/RUL-72175
• COBISS.SI-ID: 7152225
• Publication date in RUL: 08.09.2015

Secondary language

• Language: English
• Title: Seismic performance assessment of the UL FGG building on Hajdrihova st. by computer programs 3Muri and SAP2000

Abstract

In this thesis, the seismic performance assessment of the UL FGG building on Hajdrihova st. was investigated by 3Muri and SAP2000 software. In the first chapter the behaviour of masonry buildings under seismic actions are presented with an emphasis on failure mechanisms of structural components. Then follow the provisions of the Eurocode 8-3 standard, which deals with seismic assessment of existing buildings. Further on, the simplified N2 method based on non-linear static (pushover) analysis is introduced. In the practical part of the thesis the UL FGG building is presented. To achieve similar results in both programs we tried to make the model in SAP similar to 3Muri model as much as possible. Eigenvalue analysis was performed on three models – the 3Muri model, the SAP frame model and the SAP shell model. A comparison of natural periods has shown 4 % to 33 % smaller values for SAP models. The reason for differences could be in different mass moments of inertia. To check the influence of MMI, parametric analysis was performed. Results of the analysis have shown the need for enhancement of the SAP model MMI to 220 % of its original value, but this kind of adjustment cannot be physically explained. Analysis also shows that the results for two SAP models are much closer in comparison to each other than the results of any SAP model in comparison to the 3Muri model. This could be the result of different analysis methods – 3Muri using FME and SAP using FEM. In an attempt to eliminate the differences between models in both programs, a simpler model was analyzed. It turns out, the differences between models are not a consequence of the definition of structural components. More likely the difference is caused by not considering the same analysis method. Further on, the non-linear static analysis in both programs was investigated. Non-linear behaviour of the material in SAP model was modeled by defining the plastic hinges into elements of the/an equivalent frame. Again it turned out, the results of SAP and 3Muri models were far from similar.

• Keywords: graduation thesis, civil engineering, masonry building, cultural heritage, mechanical properties of masonry, nonlinear static analysis, computer programs 3Muri and SAP2000, N2 method, seismic performance assessment