Girder structure and method for producing such structures
AssigneeRecherche & Developpement du Groupe Cockerill Sambre
InventorRichard Kergen
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Abstract
The invention concerns a beam structure comprising at least a wing (1, 1′) made of at least a first metal and at least a core (2, 2′) made of at least a second metal, said core being assembled substantially perpendicular to said wing and said core being a sheet material or sheet metal. The invention is characterised in that the first metal has a high or very high yield strength, and associated with a yield strength/tensile strength ratio close to 1, the second metal has a yield strength substantially lower than that of the first metal; the second metal has a yield strength/tensile strength ratio substantially less than 0.9 and less than the value of said ratio exhibited by the first metal.
Claims19
Girder structure comprising at least one flange (1, 1′) made of at least one first metal with high mechanical characteristics, i.e. a high resistance, having an elastic limit/breaking load ratio close to 1, and at least one web (2, 2′) made of at least one second metal having an elastic limit substantially inferior to that of the first metal, said web being essentially assembled perpendicular to said flange, said flange and said web being made of sheet metal or plate metal, characterized in that:
- the second metal has an elastic limit/breaking load ratio substantially inferior to the value of said ratio of the first metal, and of less than 0,9;
- said web has geometrical characteristics that increase its buckling strength in comparison with a flat and full web of the same thickness and the same height, allowing to decrease its thickness and consequently lower the total weight of the structure.
Girder structure according to any one of the preceding claims, characterized in that it comprises at least two flanges (1, 1′) essentially parallel to each other.
Girder structure according to any one of the preceding claims, characterized in that the flanges (1, 1′) and the webs (2, 2′) are made of metallic materials that differ in their nature, their mechanical properties or their thickness.
Girder structure according to any one of the preceding claims, characterized in that it has a non-permanent cross section that varies according to the height and/or width of said structure.
Dependencies are inferred from the claim text.