diplomska naloga
Povzetek
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.
Ključne besede
gradbeništvo;UNI;dipl.;zidana konstrukcija;kulturna dediščina;mehanske lastnosti zidovja;nelineana statična "pushover" analiza;program 3Muri;program SAP2000;N2 metoda;ocena potresne odpornosti;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2015 |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UL FGG - Fakulteta za gradbeništvo in geodezijo |
Založnik: |
[N.Siebenreich] |
UDK: |
624.042.7(043.2) |
COBISS: |
7152225
|
Št. ogledov: |
3012 |
Št. prenosov: |
626 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Seismic performance assessment of the UL FGG building on Hajdrihova st. by computer programs 3Muri and SAP2000 |
Sekundarni povzetek: |
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. |
Sekundarne ključne besede: |
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; |
Vrsta datoteke: |
application/pdf |
Vrsta dela (COBISS): |
Diplomsko delo |
Komentar na gradivo: |
Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo |
Strani: |
XX, 163 str., 4 pril. |
ID: |
8889985 |