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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 <italic>y</italic>0 (<italic>x</italic>) of the closely spaced built-up member chord in the prestressing zone, distance between the chords in the clear <italic>s</italic><italic>i</italic>(<italic>x</italic>), moment of inertia <italic>J</italic><italic>i</italic>(<italic>x</italic>) relative to main axes and eccentricity <italic>e</italic><italic>i</italic>(<italic>x</italic>) of compressive force in a single chord. The length of the extreme section <italic>L</italic>1 and the prestressing zone <italic>L</italic>2, the maximum distance between chords <italic>s</italic><italic>max</italic> 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 <italic>z</italic>. 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.
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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.

Shaping of Axially Compressed Bipolarly Prestressed Closely Spaced Built-Up Members

Architecture, Civil Engineering, Environment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The paper presents a method of shaping and describing the geometry of bipolarly prestressed closely spaced built-up member with symmetrical supports and a...

Shaping of Axially Compressed Bipolarly Prestressed Closely Spaced Built-Up Members

Publié en ligne: 08 avr. 2020

Pages: 87 - 100

Reçu: 05 sept. 2019

Accepté: 28 déc. 2019

DOI: https://doi.org/10.21307/acee-2020-007

Mots clés
Axially compressed member, Bipolarly prestressed member, Bipolarly prestressed closely spaced built-up member, Bisymmetrical cross-section, Closely spaced built-up member, Load-bearing capacity

© 2020 Monika Siedlecka published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Shaping of Axially Compressed Bipolarly Prestressed Closely Spaced Built-Up Members

Publié en ligne: 08 avr. 2020

Pages: 87 - 100

Reçu: 05 sept. 2019

Accepté: 28 déc. 2019

DOI: https://doi.org/10.21307/acee-2020-007

Mots clésAxially compressed member, Bipolarly prestressed member, Bipolarly prestressed closely spaced built-up member, Bisymmetrical cross-section, Closely spaced built-up member, Load-bearing capacity

© 2020 Monika Siedlecka published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
Axially compressed member, Bipolarly prestressed member, Bipolarly prestressed closely spaced built-up member, Bisymmetrical cross-section, Closely spaced built-up member, Load-bearing capacity