Analiza adhezijsko prednapetega dvokapnega nosilca

diplomska naloga

Jože Ban (Author), Sebastjan Bratina (Mentor), Bojan Majes (Thesis defence commission member), Matjaž Dolšek (Thesis defence commission member)

Abstract

Keywords

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

Data

Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[J. Ban]
UDC:	006:624.012.46(043.2)
COBISS:	5116001
Views:	2585
Downloads:	578
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Analysis of prestressed double pitch concrete beam
Secondary abstract:	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.
Secondary keywords:	graduation thesis;"phi" slab;reinforcing steel;capacity;fire analysis;temperature;fire resistance;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. Ljubljana, Fak. za gradbeništvo in geodezijo
Pages:	XIII, 107 str., pril.
Type (ePrints):	thesis
Title (ePrints):	Analysis of prestressed double pitch concrete beam
Keywords (ePrints):	adhezijsko prednapeti beton;projektiranje;Evrokodi;mejna stanja;izgube sile prednapetja
Keywords (ePrints, secondary language):	pre-tensioned prestressed concrete;design of structures;Eurocodes;limit states;losses of prestress
Abstract (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.
Abstract (ePrints, secondary language):	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.
Keywords (ePrints, secondary language):	pre-tensioned prestressed concrete;design of structures;Eurocodes;limit states;losses of prestress
ID:	8309000