20.500.12556/RUL-82790
Projektiranje armiranobetonskega mostu za vpliv potresne obtežbe in ocena potresnega tveganja
Seismic design of reinforced concrete bridge and estimation of the seismic risk
Premostitvene konstrukcije nam omogočajo premoščanje naravnih in umetnih ovir ter so ključnega
pomena za povezovanje in združevanje ljudi. Zaradi njihove pomembnosti je te konstrukcije potrebno
projektirati in zgraditi tako, da tudi v primeru ekstremnih naravnih vplivov (npr. močan potres)
ohranijo svoj namen in tako še vedno omogočajo komunikacijo s prizadetimi območji. Ker so močni
potresi razmeroma redek dogodek, konstrukcijam zaradi neekonomičnosti v postopku projektiranja ne
zagotovimo elastičnega odziva. Konstrukciji običajno zagotovimo nekoliko manjšo nosilnost in s tem
dovolimo, da se v konstrukciji v določenih izbranih delih pojavijo poškodbe, ki jih lahko po močnem
potresu popravimo. Sposobnost konstrukcije, da prenese poškodbe (plastične deformacije) imenujemo
duktilnost konstrukcije. Plastične deformacije pri premostitvenih konstrukcijah običajno dopuščamo le
v stebrih, in sicer na mestu stika s temeljem in/ali na mestu stika s prekladno konstrukcijo. V
magistrski nalogi je prikazan postopek projektiranja tipičnega krajšega armiranobetonskega mostu v
skladu s standardom Evrokod 8/2, ki vsebuje takšen pristop k projektiranju konstrukcij. Kljub temu, da
je odziv mostov pri močnih potresih izrazito nelinearen, postopki projektiranja v splošnem še vedno
temeljijo na rezultatih linearno-elastične analize. Potresni odziv konstrukcije smo s tem razlogom
ocenili tudi s pomočjo poenostavljene nelinearne analize, ki temelji na potisni analizi, ki je bila
določena z metodo N2. Metoda vsebuje nelinearno statično analizo modela konstrukcije z več
prostostnimi stopnjami (MDOF sistem) in nelinearno dinamično analizo ekvivalentnega modela
konstrukcije z eno prostostno stopnjo (SDOF sistem). Ker standard ne predvideva eksplicitne kontrole
potresnega tveganja, varnost konstrukcije preverjamo s primerjavo vnaprej določenega ciljnega
potresnega tveganja z izračunanim potresnim tveganjem. V sklopu magistrske naloge smo varnost
konstrukcije preverili s pomočjo zahtevnejše inkrementalne dinamične analize IDA in nedavno
predlagane metode 3R, ki nam pove ali je ciljno tveganje porušitve konstrukcije preseženo.
Bridge structures enable us to span natural and artificial barriers and are the key meaning for
connecting and the agglomeration of people. Because of their importance it is necessary to design and
build them in a way that they even in a case of extreme natural events (e.g. a strong earthquake) keep
their purpose and allow communication with affected areas. Because strong earthquakes are a
comperatively rare event, we do not assure structures within the process of designing to have an elastic
response, because of the uneconomical aspect. Usually we assure structures a bit smaller load capacity
and with that we allow damage within chosen elements of the structure that can be renovated after a
strong earthquake. Ability of the structure to withstand damage (plastic deformation) is called
structure ductility. When designing bridge structures we usually allow plastic deformation in columns
at the connection with the foundation and/or at the connection with the slab. In this master's thesis we
show a procedure of designing a typical short reinforced concrete bridge in accordance with the
standard Eurocode 8/2 that contains such approach for designing structures. Even though that bridge
response in case of strong earthquakes is explicitly nonlinear, design procedures generally still base on
results of a linear-elastic analysis. Because of this, we also evaluated the seismic response of the
structure with help of the simplified nonlinear analysis, which is based on a pushover analysis that was
proposed with the N2 method. This method contains the nonlinear static analysis of the structure
model with multiple degrees of freedom (MDOF system) and the nonlinear dynamic analysis of the
equivalent structure model with a single degree of freedom (SDOF system). Because the standard does
not foresee the explicit control of the seizmic risk, we have to evaluate the safety of the structure with
comparison of in advance chosen target collapse risk with the calculated collapse risk. In this master's
thesis the safety of the structure was evaluated with a more demanding incremental dynamic analysis
IDA and recently proposed 3R method, that tells us if the structure target collapse risk is exceeded.
premostitvena konstrukcija
projektiranje
armiran beton
nelinearna
statična in dinamična analiza
potisna analiza
potresno tveganje
potresna nevarnost
metoda 3R
inkrementalna dinamična analiza
bridge structure
design
reinforced concrete
nonlinear static and
dynamic analysis
pushover analysis
seismic risk
seismic hazard
3R
method
incremental dynamic analysis
true
false
false
Slovenski jezik
Angleški jezik
Magistrsko delo/naloga
2016-05-24 02:51:05
2016-05-25 13:26:17
2022-10-27 10:17:51
0000-00-00 00:00:00
2016
0
0
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
7472993
BG2019_Possnig.pdf
BG2019_Possnig.pdf
1
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20.500.12556/rul/00ae7721-71f0-4519-9836-4a73649f7cc2
https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=86400
Fakulteta za gradbeništvo in geodezijo
0
0
0