Primerjava modelov za numerično analizo armiranobetonskih konstrukcij

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2009
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[J. Lopatič]
UDK:	519.61/.64:624.012.45:624.073(043.2)
COBISS:	4577633
Št. ogledov:	1825
Št. prenosov:	602
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Comparison of models for numerical analysis of reinforced concrete structures
Sekundarni povzetek:	This work is related to preparation of a suitable numerical model for linear elastic analysis of reinforced concrete structures by using the finite element method. Namely, the internal forces, computed by the finite element method, considerably depend on the chosen numerical model. It is well known that they depend on the “quality” of the finite element used (which is out of the influence of the user of the commercial finite element based computer code) and on the density of the finite element mesh. However, it is not so widely known that other factors may have considerable influence on computed internal forces, for example modelling of supports. It is shown in this work by several examples that “classical” support models in plate and wall analysis can lead to unbounded internal forces at support regions with refinements of the mesh. It is also shown that a remedy to this problem is usage of real stiffness of the supportive structure in the numerical model. Several structural examples are computed by different numerical models. The results are compared between the models and with the results of simplified analyses found in the literature and codes.
Sekundarne ključne besede:	graduation thesis;civil engineering;numerical model;area structure;plate;beam;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. Ljubljana, Fakulteta za gradbeništvo in geodezijo
Strani:	X, 76 str., pril.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Comparison of models for numerical analysis of reinforced concrete structures
Ključne besede (ePrints):	numerični model;ploskovna konstrukcija;plošča;nosilec
Ključne besede (ePrints, sekundarni jezik):	numerical model;area structure;plate;beam
Povzetek (ePrints):	Diplomska naloga se nanaša na pripravo ustreznega modela za linearno elastično analizo armiranobetonskih ploskovnih konstrukcij po metodi končnih elementov. Notranje sile, ki jih izračunamo s programom po metodi končnih elementov, so namreč precej odvisne od izbranega numeričnega modela. Dobro je znano, da na izračunane notranje sile vplivata “kakovost” izbranega končnega elementa (na kar uporabnik komercialnega računalniškega programa navadno ne more dosti vplivati) ter gostota mreže končnih elementov. Manj pa je znano, da na izračunane notranje sile lahko znatno vplivajo tudi drugi dejavniki, kot so npr. način modeliranje podpor. V nalogi z več primeri pokažem, da se pri “klasičnem” načinu modeliranja podpor pri analizi plošč in sten notranje sile nad podporami neomejeno večajo z zgoščevanjem mreže. Nadalje pokažem, da se ta problem lahko reši tako, da se v numeričnem modelu upošteva dejanska togost podporne konstrukcije (sten ali stebrov). Poleg tega pokažem več primerov numeričnih analiz plošč, sten in nosilcev z različnimi modeli, ki se med seboj razlikujejo predvsem v obravnavi podpor. Dobljene rezultate primerjam med seboj in z rezultati poenostavljenih analiz iz priročnikov in standardov, ki so prilagojeni “peš” računom.
Povzetek (ePrints, sekundarni jezik):	This work is related to preparation of a suitable numerical model for linear elastic analysis of reinforced concrete structures by using the finite element method. Namely, the internal forces, computed by the finite element method, considerably depend on the chosen numerical model. It is well known that they depend on the “quality” of the finite element used (which is out of the influence of the user of the commercial finite element based computer code) and on the density of the finite element mesh. However, it is not so widely known that other factors may have considerable influence on computed internal forces, for example modelling of supports. It is shown in this work by several examples that “classical” support models in plate and wall analysis can lead to unbounded internal forces at support regions with refinements of the mesh. It is also shown that a remedy to this problem is usage of real stiffness of the supportive structure in the numerical model. Several structural examples are computed by different numerical models. The results are compared between the models and with the results of simplified analyses found in the literature and codes.
Ključne besede (ePrints, sekundarni jezik):	numerical model;area structure;plate;beam
ID:	8309911