Prednapete membranske konstrukcije

diplomska naloga

Damir Kovačević (Author), Boštjan Brank (Mentor), Janko Logar (Thesis defence commission member), Jana Šelih (Thesis defence commission member), Andrej Demšar (Co-mentor)

Abstract

Keywords

gradbeništvo;diplomska dela;UNI;prednapete membranske konstrukcije;kompozitne membrane;PVC membrane;PTFE membrane;iskanje oblike;metoda gostota sile;nelinearna statična analiza;krojenje membrane;

Data

Language:	Slovenian
Year of publishing:	2012
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[D. Kovačević]
UDC:	69:624.074.4(043.2)
COBISS:	5750625
Views:	3755
Downloads:	1047
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Prestressed membrane structures
Secondary abstract:	Graduation thesis presents the entire issue of prestressed membrane structures. At the beginning a historical overview of prestressed membrane structures predecessors is given and then the behavior of prestressed double curved membranes is described. Dependence of the external load, prestress and curvature is discussed. It also presents three basic forms of prestressed membranes which are the basis of all other forms. The components and materials of prestressed membrane structures are discussed, with emphasis on the membranes. Manufacturing and mechanical and nonmechanical properties of different membranes are described. It also presents the methods for determining the mechanical characteristics of composite membranes. Uniaxial tensile testing of different composite membranes of manufacturers Verseidag and Ferrari was carried out (9 different membranes, three specimens in the warp and three in the weft direction for each) where stiffness, irreversible deformation and tensile strength are determined. Furthermore, three major phases in the design of prestressed membrane structures are discussed - formfinding, statical analysis and cutting pattern; methods and working of Easy software were presented simultaneously. At the end of the first part of the thesis connection edge and corner details, the process of membrane prefabrication, installation and tensioning are presented. In the second part three projects of prestressed membrane structures are designed with software Easy which was lent to me by Technet. For each example the three major phases of design are made, determination of membrane mechanical properties from biaxial test diagrams are shown, structure components are dimensioned, possible details, erection and tensioning process are proposed
Secondary keywords:	graduation thesis;civil engineering;construction;prestressed membrane structures;composite membranes;PVC membranes;PTFE membranes;formfinding;nonlinear analysis;cuting pattern;biaxial tensile test;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XX, 201 str.
Type (ePrints):	thesis
Title (ePrints):	Prestressed membrane structures
Keywords (ePrints):	prednapete membranske konstrukcije;kompozitne membrane;PVC membrane;PTFE membrane;iskanje oblike;metoda gostota sile;nelinearna statična analiza;krojenje membrane
Keywords (ePrints, secondary language):	prestressed membrane structures;composite membranes;PVC membranes;PTFE membranes;formfinding;nonlinear analysis;cutting pattern;biaxial tensile test
Abstract (ePrints):	V diplomski nalogi so celovito obravnavane prednapete membranske konstrukcije. Na začetku je podan zgodovinski pregled predhodnikov prednapetih membranskih konstrukcij, nato pa je ilustrativno predstavljeno obnašanje dvojno ukrivljenih antiklastičnih prednapetih membran. Podrobno je opisana odvisnost med zunanjo obtežbo, prednapetjem in ukrivljenostjo membran. Predstavljene so tri osnovne oblike prednapetih membran, s pomočjo katerih se lahko kombinira ostale možne oblike. Obravnavane so komponente prednapetih membranskih konstrukcij in njihovi materiali, s poudarkom na membranah. Podrobno so opisane proizvodnja ter mehanske in ostale lastnosti različnih membran. Predstavljeni so tudi preizkusi in metode za ugotavljanje mehanskih karakteristik kompozitnih membran. V okviru naloge je bil izvedeno enoosno natezno testiranje različnih kompozitnih membran proizvajalcev Verseidag in Ferrari (9 različnih membran, za vsako po trije preizkusi v smeri osnove in trije v smeri votka), kjer so se določevale togost, nepovratne deformacije in natezna trdnost. V nadaljevanju naloge so obravnavane tri glavne faze pri projektiranju prednapetih membranskih konstrukcij - iskanje oblike, nelinearna statična analiza in izračun krojev. Vzporedno s tem so predstavljene metode na podlagi katerih te tri faze izvede program Easy. Na koncu prvega dela diplomske naloge so predstavljeni še različni priključni detajli na robovih ter v ogliščih na membrane, procesa izdelave in postavitve konstrukcije ter postopki napenjanja membrane. V drugem delu diplomske naloge so s programom Easy, ki so mi ga za to diplomsko nalogo posodili pri podjetju Technet iz Štuttgarta, narejeni trije projekti prednapetih membranskih konstrukcij. Pri vsakem primeru so izvedene vse tri glavne faze projektiranja, prikazana je določitev mehanskih karakteristik membrane iz diagramov dvoosnega testiranja, dimenzionirane so membranske in jeklene komponente konstrukcije, predlagani so možni membranski spojni detajli, na koncu pa je predlagan še postopek postavitve konstrukcije ter napenjanja membrane.
Abstract (ePrints, secondary language):	Graduation thesis presents the entire issue of prestressed membrane structures. At the beginning a historical overview of prestressed membrane structures predecessors is given and then the behavior of prestressed double curved membranes is described. Dependence of the external load, prestress and curvature is discussed. It also presents three basic forms of prestressed membranes which are the basis of all other forms. The components and materials of prestressed membrane structures are discussed, with emphasis on the membranes. Manufacturing and mechanical and nonmechanical properties of different membranes are described. It also presents the methods for determining the mechanical characteristics of composite membranes. Uniaxial tensile testing of different composite membranes of manufacturers Verseidag and Ferrari was carried out (9 different membranes, three specimens in the warp and three in the weft direction for each) where stiffness, irreversible deformation and tensile strength are determined. Furthermore, three major phases in the design of prestressed membrane structures are discussed - formfinding, statical analysis and cutting pattern; methods and working of Easy software were presented simultaneously. At the end of the first part of the thesis connection edge and corner details, the process of membrane prefabrication, installation and tensioning are presented. In the second part three projects of prestressed membrane structures are designed with software Easy which was lent to me by Technet. For each example the three major phases of design are made, determination of membrane mechanical properties from biaxial test diagrams are shown, structure components are dimensioned, possible details, erection and tensioning process are proposed
Keywords (ePrints, secondary language):	prestressed membrane structures;composite membranes;PVC membranes;PTFE membranes;formfinding;nonlinear analysis;cutting pattern;biaxial tensile test
ID:	8312308