Potresna ranljivost montažnih armiranobetonskih hal

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2008
Izvor:	Ljubljana
Tipologija:	2.08 - Doktorska disertacija
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[M. Kramar]
UDK:	624.012.45:624.042.7(043.3)
COBISS:	4122209
Št. ogledov:	2158
Št. prenosov:	611
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Seismic vulnerability of precast reinforced concrete structures
Sekundarni povzetek:	In the Ph.D. thesis, the seismic vulnerability and seismic collapse risk of precast reinforced concrete structures, typical for the building practice in Slovenia and Europe, are discussed. Full-scale pseudo- dynamic and cyclic tests of some precast structures have confirmed the assumption of the large strength of connections, and have provided important information about the behaviour of very slender cantilever columns when subjected to large deformations, as the structure approaches collapse. Based on the experimental results obtained, an improved numerical model capable of modelling global collapse was formulated for such columns with large shear spans. The model was applied to the seismic risk assessment of precast structures. Seismic risk was evaluated by means of probabilistic analysis, taking into account the randomness in seismic excitations and other sources of uncertainty. A solution strategy, which is based on an intensity measure rather than a damage measure, has been suggested. A special study focused on the variance related to the uncertainty in the numerical modelling of the structure. A verified probabilistic method was used to assess the seismic risk of the whole range of the analyzed precast structures, as built in practice. It was found that the minimum detailing requirements according to Eurocode 8 usually provide such structures with sufficient overstrength so that the seismic risk is acceptably low (the probability of collapse is 0.1–1.2 % in 50 years). However, if only design reinforcement is provided in the structures, the seismic risk is rather high (the probability of collapse is 1.0–8.5 % in 50 years). The results have been used to obtain a quantitative evaluation of the force reduction factor used in Eurocode 8.
Sekundarne ključne besede:	civil engieering;doctoral thesis;precast reinforced concrete structures;precast connections;slender cantilever columns;global collapse;collapse capacity;limit state probability;seismic vulnerability;seismic collapse risk;force reduction factor;
URN:	http://www.dlib.si/?urn=URN:NBN:SI:doc-79DQJH2G
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Doktorska disertacija
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XIV, 176 str., pril.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Seismic vulnerability of precast reinforced concrete structures
Ključne besede (ePrints):	montažne armiranobetonske hale;montažni stiki;vitki konzolni stebri;globalna porušitev;kapaciteta konstrukcije;verjetnost porušitve;potresna ranljivost;potresno tveganje;faktor redukcije potresnh sil
Ključne besede (ePrints, sekundarni jezik):	precast reinforced concrete structures;precast connections;slender cantilever columns;global collapse;collapse capacity;limit state probability;seismic vulnerability;seismic collapse risk;force reduction factor
Povzetek (ePrints):	V doktorski disertaciji smo ocenili potresno ranljivost in tveganje za montažne armiranobetonske hale, ki so značilne za gradnjo v Sloveniji in Evropi. S psevdo-dinamičnimi in cikličnimi preizkusi montažnih hal v naravnem merilu smo potrdili predpostavko o močnih stikih in raziskali obnašanje zelo vitkih stebrov v post-kritičnem območju pri velikih deformacijah. S temi podatki smo lahko nadgradili numerične modele za opis globalne porušitve stebrov, ki so do sedaj veljali le za stebre z razmeroma majhnimi strižnimi razponi. Model smo uporabili v oceni tveganja z verjetnostno analizo, v kateri smo upoštevali nepredvidljivost potresne obtežbe in druge vire nezanesljivosti. Predlagali smo, da se uporabi metoda, v kateri kapaciteto konstrukcije namesto s pomikom, izrazimo z intenziteto potresne obtežbe. V posebni študiji smo obravnavali parameter te metode, s katerim ocenimo raztros, ki izhaja iz nezanesljivosti v določitvi numeričnega modela konstrukcije. Z izbrano in umerjeno metodo smo ocenili potresno tveganje za vse možne variante enoetažnih montažnih hal obravnavanega tipa, ki se lahko pojavijo v praksi. Ugotovili smo, da minimalne konstrukcijske zahteve v Evrokodu 8 praviloma zagotavljajo takšnim halam dovolj dodatne nosilnosti, da je potresno tveganje sprejemljivo (verjetnost porušitve 0.1–1.2 % v 50 letih). Če pa konstrukcijam zagotovimo le računsko potrebno armaturo, je tveganje dokaj visoko (verjetnost porušitve 1.0–8.5 % v 50 letih). Ti rezultati so omogočili kvantitativno ovrednotenje faktorja redukcije potresnih sil v Evrokodu 8.
Povzetek (ePrints, sekundarni jezik):	In the Ph.D. thesis, the seismic vulnerability and seismic collapse risk of precast reinforced concrete structures, typical for the building practice in Slovenia and Europe, are discussed. Full-scale pseudo- dynamic and cyclic tests of some precast structures have confirmed the assumption of the large strength of connections, and have provided important information about the behaviour of very slender cantilever columns when subjected to large deformations, as the structure approaches collapse. Based on the experimental results obtained, an improved numerical model capable of modelling global collapse was formulated for such columns with large shear spans. The model was applied to the seismic risk assessment of precast structures. Seismic risk was evaluated by means of probabilistic analysis, taking into account the randomness in seismic excitations and other sources of uncertainty. A solution strategy, which is based on an intensity measure rather than a damage measure, has been suggested. A special study focused on the variance related to the uncertainty in the numerical modelling of the structure. A verified probabilistic method was used to assess the seismic risk of the whole range of the analyzed precast structures, as built in practice. It was found that the minimum detailing requirements according to Eurocode 8 usually provide such structures with sufficient overstrength so that the seismic risk is acceptably low (the probability of collapse is 0.1–1.2 % in 50 years). However, if only design reinforcement is provided in the structures, the seismic risk is rather high (the probability of collapse is 1.0–8.5 % in 50 years). The results have been used to obtain a quantitative evaluation of the force reduction factor used in Eurocode 8.
Ključne besede (ePrints, sekundarni jezik):	precast reinforced concrete structures;precast connections;slender cantilever columns;global collapse;collapse capacity;limit state probability;seismic vulnerability;seismic collapse risk;force reduction factor
ID:	8311036