Shaping of axially compressed bipolarly prestressed closely spaced built-up members

• Autorzy: Siedlecka Monika

Identyfikatory

DOI

10.21307/ACEE-2020-007

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

axially compressed member; bipolarly prestressed member; bipolarly prestressed closely spaced built-up member; bisymmetrical cross-section; closely spaced built-up member; load-bearing capacity

PL

pręt ściskany osiowo; pręt sprężony dwubiegunowo; pręt bliskogałęziowy sprężony dwubiegunowo; przekrój poprzeczny bisymetryczny; pręt bliskogałęziowy; nośność

• Wydawca: Silesian University of Technology
• Czasopismo: Architecture Civil Engineering Environment
• Rocznik: 2020
• Tom: Vol. 13, no. 1
• Strony: 87--100
• Opis fizyczny: Bibliogr. 45 poz.

Twórcy

autor

Siedlecka Monika

• PhD Eng.; Kielce University of Technology, Faculty of Civil Engineering and Architecture, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).