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Title:CALIBRATION OF A NEW METHOD FOR CREATING IMPERFECTIONS ON SLENDER STRUCTURES : magistrsko delo
Authors:ID Hudales, Simon (Author)
ID Vesenjak, Matej (Mentor) More about this mentor... New window
ID Burkhardt, Axel (Comentor)
Files:.pdf MAG_Hudales_Simon_2022.pdf (5,14 MB)
MD5: E66802517AFCCBB3D6066857ACC4DC3F
PID: 20.500.12556/dkum/61cfe961-9772-4b5b-8737-f48f8ce7e683
 
Language:English
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:For the design of slender structures consisting of plates and tubes, such as supporting structures at cranes, buckling is beside stress and fatigue often the governing failure criteria. Stability analysis of such structures is usually performed using the GMNIA method according to DIN EN 1993. For this purpose, a suitable geometric equivalent imperfection must be applied to the structure. Buckling inherent shapes are determined for this purpose and scaled according to applicable safety concepts. Including imperfections in stability analysis can generally be relevant for the load-bearing behavior of a structure. Within this master thesis work, the influence of the initial geometric imperfection on stability behaviour is investigated. This study examines the influence, that imperfections imposed on members subjected to tensile stress have on stability behaviour. Tensile members of structures are identified and initial geometric imperfection is imposed on them in addition to critical members, that are subjected to compression stress. It is shown, that including imperfections on tensile members in stability analysis, has only a minor influence on stability behaviour and stiffness of the structure, both reducing it just slightly. Further on, investigation on boom model, that is supporting structure of the crawler crane, is made. Boom model consist of main chord members and diagonals connecting them. At the joint connection of boom and two diagonal members, one subjected to tension and one subjected to compression stress, appears area of high shear stresses. Influence of the direction, that imperfection is imposed on the diagonal member, and what is the influence on the stability behaviour and structural strength is presented in this work. Most severe case of the two chosen direction is pointed out and discussed.
Keywords:stability analysis, initial geometric imperfections, thin-walled structures, finite element method
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[S. Hudales]
Year of publishing:2022
Number of pages:1 elektronski vir (1 datoteka PDF (XIVI, 71 f.))
PID:20.500.12556/DKUM-81847 New window
UDC:62-237:620.179.7(043.2)
COBISS.SI-ID:151258371 New window
Publication date in DKUM:06.07.2022
Views:588
Downloads:61
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
:
HUDALES, Simon, 2022, CALIBRATION OF A NEW METHOD FOR CREATING IMPERFECTIONS ON SLENDER STRUCTURES : magistrsko delo [online]. Master’s thesis. Maribor : S. Hudales. [Accessed 28 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=81847
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:08.06.2022

Secondary language

Language:Slovenian
Title:UMERJANJE NOVE METODE ZA USTVARJANJE NEPOPOLNOSTI NA VITKIH STRUKTURAH
Abstract:Pri načrtovanju vitkih konstrukcij, sestavljenih iz plošč in cevi, kot so žerjavi, sta pogosto odločilni merili porušitve upogibanje in upogib. Stabilnostna analiza takšnih konstrukcij se običajno izvaja z metodo GMNIA v skladu z DIN EN 1993. V ta namenje treba na konstrukciji uporabiti ustrezno geometrijsko ekvivalentno nepopolnost. V ta namen se določijo inherentne oblike izbočenja, ki se skalirajo v skladu z veljavnimi varnostnimi koncepti. Vključitev nepopolnosti v stabilnostno analizo je lahko na splošno pomembna za obnašanje nosilne konstrukcije. V tem magistrskem delu je raziskan vpliv začetne geometrijske nepopolnosti na stabilnostno obnašanje. V tej študiji se preučuje vpliv, ki ga imajo nepopolnosti na elementih, izpostavljenih natezni obremenitvi, na stabilnostno obnašanje. Opredeljeni so natezni elementi konstrukcij, na katere se poleg kritičnih elementov, ki so izpostavljeni tlačni obremenitvi, definirajo začetne geometrijske nepopolnosti. Pokazalo se je, da vključitev nepopolnostina nateznih elementih pri analizi stabilnosti vpliva na stabilno obnašanje, saj se togost opazovane konstrukcije zmanjša. Oblike lastnih oblik izbočenja, pridobljene z linearno analizo izbočenja, nimajo opredeljene najhujše usmeritve. V tej študiji je bila opravljena preiskava na nateznih elementih podpornih konstrukcij. V ta namen je bila izvedena študija primera z različnimi koti med glavnim in ojačitvenim elementom. Ugotovljeno je bilo, da različne nastavitve kota med glavnim in ojačitvenim elementom nimajo bistvenega vpliva na stabilnostno obnašanje, čeprav vplivajo na trdnost konstrukcije.
Keywords:analiza stabilnosti, geometrijske nepravilnosti, vitke konstrukcije, metoda končnih elementov


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