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[97590] Artykuł: SHAPING OF AXIALLY COMPRESSED BIPOLARLY PRESTRESSED CLOSELY SPACED BUILT-UP MEMBERS(Kształtowanie osiowo ściskanych prętów bliskogałęziowych sprężonych bipolarnie)Czasopismo: Architecture Civil Engineering Environment Tom: 13, Zeszyt: 1, Strony: 87-100 ISSN: 1899-0142 Opublikowano: Marzec 2020 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 70 Pełny tekst DOI Keywords: Axially compressed member  Bipolarly prestressed member  Bipolarly prestressed closely spaced built-up member  Bisymmetrical cross-section  Closely spaced built-up member  Load-bearing capacity  |
The paper presents a method of shaping and describing the geometry of bipolarly prestressed closely spaced built-up member with symmetrical supports and a bisymmetrical cross-section. The following has been defined as a function dependant on the position along the length of the x section of the closely spaced built-up member with determined geometrical parameters: intial elastic y0 (x) of the closely spaced built-up member chord in the prestressing zone, distance between the chords in the clear si(x), moment of inertia Ji(x) relative to main axes and eccentricity ei(x) of compressive force in a single chord. The length of the extreme section L1 and the prestressing zone L2, the maximum distance between chords smax in the clear and the geometric characteristics of a single chord section were assumed. A full and correct description of the geometry of bipolarly prestressed closely spaced built-up members is necessary to start the static and stress analysis. As a result of the introduction of a bipolar displacement prestressing into the closely spaced built-up member, the moment of inertia increases in the middle part with respect to the non-material axis z. It allows predicting the increase of the critical load bearing capacity of the closely spaced built-up member. The load bearing capacity of bipolarly prestressed closely spaced built-up members was estimated using the modified Engesser’s formula for two-chord closely spaced built-up member with rigid battens. For selected pair of channel sections, the analytical critical load estimation results were verified using FEM.