Analiza adhezijsko prednapetega dvokapnega nosilca

diplomska naloga

Jože Ban (Avtor), Sebastjan Bratina (Mentor), Bojan Majes (Član komisije za zagovor), Matjaž Dolšek (Član komisije za zagovor)

Povzetek

Ključne besede

gradbeništvo;diplomska dela;UNI;adhezijsko prednapeti beton;projektiranje;Evrokodi;mejna stanja;izgube sile prednapetja;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2010
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[J. Ban]
UDK:	006:624.012.46(043.2)
COBISS:	5116001
Št. ogledov:	2585
Št. prenosov:	578
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Analysis of prestressed double pitch concrete beam
Sekundarni povzetek:	In the graduation thesis we design 25 m long prestressed double pitch concrete beam in accordance with the requirements of the Slovenian Standard SIST EN 1992-1-1:2005. The beam is part of the roof on the one-floor production business building. We analyzed time dependent stress and strain state with commercial computer program Scia Engineer 2010 student version. The program is based on finite element method and allows analysis of concrete, steel, wood and aluminum structures for different standards. Concrete part and prestressed reinforcement are modeled with separate fine elements. The total number of fine elements is 1326. Prestressed beam is analyzed in six construction stages. In stage 0 we tension cables on tensioning force, initial force of prestressing begins to act on concrete in stage 1, in stage 2 we model the transport of the element on the landfill and in stage 6 we calculate the final value of losses due to relaxation of prestressing steel, shrinkage and creep of concrete. In analyzing the stress and strain state we consider all limits of stress in prestressing steel, steel reinforcement and concrete. On the upper edge of the concrete cracks occur in stage 2. In final stage, i.e. stage 6, the entire beam is pressure loaded in all combination off effects (characteristic, frequent or quasi-permanent). Further, we check security of the beam in ultimate limit states at axial-bending and shear load. We provide sufficient flexural and shear reinforcement. On the reinforcement plans we show the results of dimensioning.
Sekundarne ključne besede:	graduation thesis;"phi" slab;reinforcing steel;capacity;fire analysis;temperature;fire resistance;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. Ljubljana, Fak. za gradbeništvo in geodezijo
Strani:	XIII, 107 str., pril.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Analysis of prestressed double pitch concrete beam
Ključne besede (ePrints):	adhezijsko prednapeti beton;projektiranje;Evrokodi;mejna stanja;izgube sile prednapetja
Ključne besede (ePrints, sekundarni jezik):	pre-tensioned prestressed concrete;design of structures;Eurocodes;limit states;losses of prestress
Povzetek (ePrints):	V diplomski nalogi projektiramo predhodno prednapeti dvokapni nosilec dolžine 25 m skladno z zahtevami iz standarda SIST EN 1992-1-1:2005. Nosilec je del strešne konstrukcije enoetažnega proizvodno poslovnega objekta. Časovno odvisno napetostno in deformacijsko stanje nosilca analiziramo s pomočjo komercialnega računalniškega programa Scia Engineer 2010 student version. Program temelji na metodi končnih elementov in omogoča analizo betonskih, jeklenih, lesenih in aluminijastih konstrukcij po različnih standardih. Betonski del nosilca in prednapete kable modeliramo z ločenimi linijskimi končnimi elementi. Skupno število uporabljenih končnih elementov znaša 1326. Prednapeti nosilec analiziramo v šestih fazah. V fazi 0 napenjamo kable na napenjalno silo, v fazi 1 na beton deluje začetna sila prednapetja, v fazi 2 modeliramo transport elementa na deponijo, v fazi 6 pa izračunamo končne vrednosti izgub prednapetja zaradi relaksacije jekla ter krčenja in lezenja betona. Pri analizi napetostnega in deformacijskega stanja upoštevamo vse omejitve napetosti v jeklu za prednapenjanje, armaturi ter v betonu. V fazi 2 se na zgornjem betonskem robu nosilca pojavijo razpoke. V končnem stanju, t.j. v fazi 6, pa je ves nosilec tlačno obremenjen in to ne glede na izbrano kombinacijo vplivov (karakteristična, pogosta ali navidezno stalna). Dodatno preverimo tudi varnost nosilca v mejnem stanju nosilnosti pri osno-upogibni in strižni obremenitvi. V nosilcu zagotovimo zadostno upogibno in strižno armaturo. Rezultate dimenzioniranja prikazujemo na armaturnih načrtih nosilca.
Povzetek (ePrints, sekundarni jezik):	In the graduation thesis we design 25 m long prestressed double pitch concrete beam in accordance with the requirements of the Slovenian Standard SIST EN 1992-1-1:2005. The beam is part of the roof on the one-floor production business building. We analyzed time dependent stress and strain state with commercial computer program Scia Engineer 2010 student version. The program is based on finite element method and allows analysis of concrete, steel, wood and aluminum structures for different standards. Concrete part and prestressed reinforcement are modeled with separate fine elements. The total number of fine elements is 1326. Prestressed beam is analyzed in six construction stages. In stage 0 we tension cables on tensioning force, initial force of prestressing begins to act on concrete in stage 1, in stage 2 we model the transport of the element on the landfill and in stage 6 we calculate the final value of losses due to relaxation of prestressing steel, shrinkage and creep of concrete. In analyzing the stress and strain state we consider all limits of stress in prestressing steel, steel reinforcement and concrete. On the upper edge of the concrete cracks occur in stage 2. In final stage, i.e. stage 6, the entire beam is pressure loaded in all combination off effects (characteristic, frequent or quasi-permanent). Further, we check security of the beam in ultimate limit states at axial-bending and shear load. We provide sufficient flexural and shear reinforcement. On the reinforcement plans we show the results of dimensioning.
Ključne besede (ePrints, sekundarni jezik):	pre-tensioned prestressed concrete;design of structures;Eurocodes;limit states;losses of prestress
ID:	8309000