Overview
FrançaisABSTRACT
This article deals mainly with the design of composite columns of doubly symmetrical cross-sections subjected to compression, uniaxial or biaxial bending and transverse shear. It applies to isolated columns and columns included in sway or non-sway frames. It also deals with the shear resistance of the steel-concrete interface and states some detailing provisions to be satisfied for concrete cover and reinforcement. Two worked examples are given for illustration purposes. Finally, some basic notions are given for designing other types of less frequently used composite columns.
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Read the articleAUTHOR
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Jean-Marie ARIBERT: Emeritus University Professor – Consultant in steel-concrete composite construction - Former Director of the Structures Laboratory at INSA Rennes
INTRODUCTION
A general presentation of composite columns was given in § 1.2.3 of the article
posts partially or totally encased in concrete ;
hollow sections filled with concrete.
Like steel posts, composite posts offer the following advantages:
high load-bearing capacity for relatively small cross-sections;
ease of assembly with other elements, beams in particular, due to the presence of the steel part of the columns (cf. § 1.2.4 of article
);[C 2560] the ability to deform in the plastic range and exhibit ductile behavior.
Thanks to the collaboration of concrete and steel, the mixed column solution can significantly reduce the cross-section of the steel section, compared with the steel-only column solution, for a given load-bearing capacity.
The protection provided by concrete, in the case of partially encapsulated sections (and even more so for fully encapsulated sections), can give these elements a high level of fire resistance (see clause 4.3.5. and Annex G of EN 1994-1-2). Even in the case of hollow sections filled with unprotected concrete, the reinforced concrete inner section more than compensates for the loss of strength of the rapidly heating steel, and can achieve appreciable fire durations, provided that appropriate dimensioning is used (see Annex PCRB to
NF EN 1994-1-2/NA
and
,
; see also
The first studies on the load-bearing capacity of composite columns at ordinary temperatures...
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KEYWORDS
steel | building | Concrete | metallic construction | civil engineering | structural analysis
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Steel-concrete composite construction – Design of composite columns
Bibliography
Websites
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Arcelor Sections – Brochure "Mixed steel construction – concrete based on laminated beams".
http://197.14.51.10 :81/pmb/GENIE CIVIL/Construction_Mixte.pdf
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CTICM & ArcelorMittal – Brochures "Good Practices for the Construction of Steel Structures – Commercial...
Software tool
A3C software, developed by CTICM in collaboration with ArcelorMittal: version 2.50 of March 2016 deals with the case of compressed and bent composite columns, with partially or totally encapsulated I and H steel sections.
https://www.cticm.com/content/a3c-logiciel-verification-barre-Eurocodes.3-et-4
...Standards and norms
- Teil 5: Stahlbauten – Verbundtragwerke aus Stahl und Beton Bemessung und Konstruktion - DIN18 800 - 1998
- Welding – Arc welding of studs on metallic materials. NF EN ISO 14555, referenced A 89-600 - AFNOR - 2014
- Eurocode 4 : Calcul des structures mixtes acier-béton. Partie 1-1 : Règles générales et règles pour les bâtiments. NF EN 1994-1-1, d'indice de classement P 22-411-1 - AFNOR - 2005
- Annexe...
Directory
Manufacturers
Baudin Chateauneuf – Structural Steel Department
http://www.baudinchateauneuf.com
Eiffage Construction Métallique
Castel et Fromaget (Fayat Group)
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