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GRAĐEVINSKI
MATERIJALI I KONSTRUKCIJE
ČASOPIS ZA ISTRAŽIVANJA U OBLASTI MATERIJALA I KONSTRUKCIJA

 

FLEKSIONO IZVIJANJE NAKNADNO TERMIČKI OBRAĐENIH I HLADNOOBLIKOVANIH STUBOVA ELIPSASTOG POPREČNOG PRESEKA: NUMERIČKA UPOREDNA ANALIZA

Abstract: 

Even though structural elements of the elliptical hollow section (EHS) have been introduced to the construction market in the past years, the rules for their design were only partially introduced into the suitable codified procedures. The aim of this paper is to present a comparative numerical analysis of behaviour of cold-formed and hot-finished EHS columns exposed to flexural buckling under pure axial compression. Pin-ended columns of a various slenderness without lateral restrains and with incorporated geometrical imperfec-tions are analysed. Material nonlinear behaviour is included through published experimental tensile test results, conducted in previous researches. In addition, numerical simulations of stub column behaviour are performed in order to obtain a cross-section compres-sive resistance. Results of the finite element analysis are compared to the design criteria defined in the draft version of Eurocode EN 1993-1-1:2015 and in North American specification for cold-formed member design AISI-S100. It is observed that North American standard provides more accurate predictions of both a cross-section resistance and a buckling column resistance. Equivalent diameter method described in Eurocode 3 led to more conservative results. According to the obtained numerical results, similar buckling behaviour is observed for both hot-finished and cold-formed columns of higher slenderness, while in the lower slenderness region, cold-formed compressed members tend to lower buckling curves. Underestimation of a column buckling resistance according to Eurocode regulations is noticed for cold-formed members of a higher slenderness.

Article status: 
Published
Journal number: 
2019-02

Authors

Isidora Jakovljević, master inž.građ. - Univerzitet u Beogradu, Građevinski fakultet, Bulevar kralja Aleksandra 73, 11000 Beograd
docent dr Jelena Dobrić, dipl. građ. inž. - Univerzitet u Beogradu, Građevinski fakultet, Bulevar kralja Aleksandra 73, 11000 Beograd
profesor dr Zlatko Marković, dipl. građ. inž. - Univerzitet u Beogradu, Građevinski fakultet, Bulevar kralja Aleksandra 73, 11000 Beograd

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