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Projektiranje jeklenih nosilcev z odprtinami : diplomska naloga
ID Ivančič, Polona (Author), ID Može, Primož (Mentor) More about this mentor... This link opens in a new window

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PID: 20.500.12556/rul/292772a2-86b8-49cb-b2b6-66ca1b89f21f

Abstract
V pripravi je nov standard iz skupine standardov Evrokod 3, ki bo podajal navodila za projektiranje jeklenih nosilcev z odprtinami v stojini. Diplomska naloga z naslovom ''Projektiranje jeklenih nosilcev z odprtinami'' sistematično opiše številne prednosti izdelave in uporabe jeklenih nosilcev z odprtinami ter izpostavlja osnovne probleme, ki se pojavijo v zvezi z nosilnostjo teh nosilcev. V tem pogledu avtor naloge predstavi navodila predloga standarda EN 1993-1-13 (april 2017) in jih uspešno preizkusi na računskem primeru jeklenega nosilca z okroglimi odprtinami. Eden od pomembnih prispevkov naloge je prikaz uporabe alternativne metode izračuna notranjih sil in nosilnosti prerezov v ravninah okrog odprtin. Metoda je zamudna, ker je potrebno rezultate izračuna Vierendeel-ovega modela nosilca kontrolirati za kritične prereze pri različnih kotih (korak 5°). Da je v teh primerih primernejša uporaba računalnika je pokazal izračun nosilca z računalniškim programom ACB+ (ArcelorMittal), katerega rezultati so priloženi na zaključku naloge (priloga A). Druga pomembna alternativna metoda, ki se poleg splošne uporablja za kontrolo nosilnosti na lokalno izbočenje stojine med odprtinami, temelji na empirični študiji analize končnih elementov. Na podlagi razlage navodil bodočega standarda lahko sklepamo, da bo kljub določenim omejitvam omogočena njegova široka uporaba v praksi, saj ga bo možno uporabiti pri projektiranju nosilcev z odprtinami iz vroče valjanih ali varjenih profilov, satastih nosilcev ali nosilcev s posameznimi odprtinami različnih oblik in dimenzij. Obseg proizvodnje in uporabe jeklenih nosilcev z odprtinami v stojini je odvisen od sodelovanja proizvajalcev, projektantov, dobaviteljev in gradbenikov. Za razliko od razvitih držav, v Sloveniji še ne koristimo vseh možnosti tega proizvoda. Uporaba standarda EN 1993-1-13 lahko pomeni pomemben korak v tej smeri.

Language:Slovenian
Keywords:nosilci z odprtinami, Vierendeelov upogib, izbočenje stojine, Evrokod 3
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publisher:[P. Ivančič]
Year:2017
PID:20.500.12556/RUL-99778 This link opens in a new window
UDC:624.014:624.072.2(043.2)
COBISS.SI-ID:8509537 This link opens in a new window
Publication date in RUL:15.02.2018
Views:1882
Downloads:509
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Secondary language

Language:English
Title:Design of steel beams with web openings : graduation thesis
Abstract:
A new standard from Eurocode 3 is in preparation, which will provide rules for the design of steel beams with web openings. The graduation thesis entitled ''Design of steel beams with web openings'' sistematically describes numerous advantages of their production and usage of steel beams with openings, and highligts the basic problems connected with their strenght. Author presents the guidelines of the draft standard EN 1993-1-13 (April 2017) and successfully implements them in the analysis of cellular beam with circular openings. One of the most important contribution of this work is to demonstrate the use of an alternative method to determine internal forces, moments and resistances at sections around the openings. The consequence necessity of checking the results of Vierendeel model at critical cross-sections corresponding to different angles (by increments of 5°) is time-consuming method. In this case the use of computer is more appropriate as shown in analysis of the girder with computer program ACB+ (ArcelorMittal) at the end of the presented work (Annex A). Another significant alternative method, which in addition to the general approach verifies the resistance of web post buckling, is based on the empirical study of the finite element analysis. Based on the interpretation of standard (yet not accepted), it may be assumed that it will be used in practice widely, despite certain limitations, namely in the design of rolled and fabricated beams with isolated or closely spaced web openings, with various shapes and dimensions. The production volume and use of steel beams with web openings depends on the participation of manufacturers, designers, suppliers and builders. In comparison with developed countries, Slovenia does insignificantly exploits all the possibilities this product has. The important step in this direction can be use of the standard EN 1993-1-13.

Keywords:Beams with web openings, Vierendeel bending, Web post buckling, Eurocode 3

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