Numerična analiza velike zračno podprte konstrukcije nepravilne oblike : magistrsko delo

Majhen, Matija (author), Brank, Boštjan (mentor), Četina, Matjaž (comentor)

Predstavljena je numerična analiza velike zračno podprte membranske konstrukcije nepravilne oblike. Membranske konstrukcije zahtevajo drugačen pristop k projektiranju, kot je uveljavljen pri klasičnih gradbenih konstrukcijah. Pri konstrukcijah iz klasičnih gradbenih materialov, kot so les, beton in jeklo, je začetna geometrija konstrukcije znana, išče pa se notranje sile pri projektni obtežbi. Pri membranskih konstrukcijah pa je osnovni korak iskanje njene začetne oblike: ob predpostavljeni vrednosti prednapetja v membrani, se išče pripadajočo začetno obliko. V nalogi je prikazano iskanje začetne oblike zračno podprte membranske konstrukcije s pomočjo komercialnega računalniškega programa Dlubal RFEM. Vetrna obtežba je bila zaradi zahtevne oblike membrane določena z uporabo numerične dinamike tekočin, in sicer s programom Dlubal RWIND Simulation. Ob znani lastni teži, stalni obtežbi, notranjem nadpritisku (in posledično prednapetju), vetrni obtežbi in obtežbi snega, je bila nato za različne obtežne kombinacije s programom Dlubal RFEM izvedena geometrijska nelinearna analiza. Z rezultati analize se je preverila nosilnosti izbranih materialov in določilo reakcijske sile ob vpetju membrane, ki so osnovni podatek za dimenzioniranje temeljev. Podano je tudi teoretično ozadje posameznih faz projektiranja zračno podprte membranske konstrukcije, ki ga uporabljajo v magistrski nalogi uporabljeni komercialni računalniški programi.

• Language: Slovenian
• Keywords: zračno podprte membranske konstrukcije, numerična analiza, iskanje oblike, numerična dinamika tekočin, geometrijsko nelinearna analiza
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Majhen]
• Year: 2021
• PID: 20.500.12556/RUL-127214
• UDC: 519.6:624.074.4(043.3)
• COBISS.SI-ID: 69209091
• Publication date in RUL: 26.05.2021

MAJHEN, Matija, 2021, Numerična analiza velike zračno podprte konstrukcije nepravilne oblike : magistrsko delo [online]. Master’s thesis. Ljubljana : M. Majhen. [Accessed 19 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=127214

Secondary language

• Language: English
• Title: Numerical analysis of air-supported membrane structure with irregular shape : master thesis

Abstract

Numerical analysis of large air-supported structure of irregular shape is represented. Air-supported structures are in civil engineering special category of structures, which require different design approach and consideration from engineering perspective, compared to conventional structures. Structures, made from most common used building materials (such as wood, concrete or steel), have known geometry, but unknown internal forces according to design loads. On the other hand, form and geometrical boundary conditions, when analysing air-supported membrane structures, must be found in first place, with use of certain level of pre-stress. First, form-finding of air-supported structure of irregular shape was presented, using commercial software Dlubal RFEM. Wind loads were because of geometrical irregularitiy of structure specified with computational fluid dynamics software Dlubal RWIND Simulation. Based on self-weight, internal pressure, wind loads and snow loads different load combinations with Dlubal RFEM as a part of geometrical non-linear analysis were performed, to verify load-bearing capacity of choosen materials and specify foundation loads on the anchorage axis positions, which could be further used for foundation design. Individual phases of design procedure of air-supported structures of irregular shape are showed also with theoretical explanation of numerical methods, which are crucial for design of air-supported structures and which are present also in the software's background, to perform computational numerical calculations.

• Keywords: air-supported membrane structures, numerical analysis, form-finding, computational fluid dynamics, geometricaly non-linear analysis