Open web dissymmetric beam construction

E - Fixed Constructions – 04 – B

Patent

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Details

E04B 2/00 (2006.01) E04B 5/43 (2006.01) E04C 3/08 (2006.01) E04C 3/04 (2006.01)

Patent

CA 2407359

A structural framing system (10) and method of construction in which adjacent vertical columns (18) horizontally support an open web dissymmetric steel beam (14) with trapezoidal openings (15) located along the web (14c) between a narrowed, thickened top flange (14a) and a widened bottom flange (14b). The beam's bottom flange (14b) supports precast concrete plank hollow sections (12) located perpendicular to the beam (14) so that the beam's open web (14c) is centrally disposed between end sections of the plank sections in substantially the same horizontal plane. A high-strength grout mixture (16) flows completely through the web openings (15) in a circulatory manner. This creates a substantially monolithic concrete encasement around the beam (14) that improves the resulting composite action and mechanical interlock between the steel beam (14) and concrete plank (12) and prevents loss of strength due to the grout (16) separating from either side of the beam (14).

Un système d'encadrement structurel (10) et un procédé de construction selon lequel des colonnes verticales adjacentes (18) supportent horizontalement une poutre à treillis dissymétrique en acier (14) doté d'orifices trapézoïdaux (15) qui sont situés le long de la poutre (14c) entre une flasque supérieure (14a) courte et épaisse et une flasque inférieure large (14b). La flasque inférieure (14b) de la poutre supporte des sections creuses de panneau en béton préfabriqué (12) perpendiculaires à la poutre (14) de telle façon que le treillis (14c) de la poutre soit placé au centre entre les sections terminales des sections panneau sensiblement dans le même plan horizontal. Un coulis de haute résistance (16) s'écoule entièrement à travers les orifices (15) de l'âme de manière circulatoire. On obtient ainsi un encadrement en béton sensiblement monolithique autour de la poutre (14), ce qui permet d'améliorer l'action composite résultante et l'interverrouillage mécanique entre la poutre d'acier (14) et le panneau en béton (12) et d'empêcher la perte de résistance due à la séparation du coulis (16) de chaque côté de la poutre (14).

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