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.
Claims25
A girder structure comprising at least one flange made of at least one first metal with high mechanical resistance, having an elastic limit/breaking load ratio close to 1, and at least one web 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,
- the second metal having 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 having 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.
A method for assembling a girder structure comprising at least one flange and at least one web, and said at least one flange made of at least one first metal with high mechanical resistance, having an elastic limit/breaking load ratio close to 1, and said at least one web 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,
- the second metal having 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 having 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,
- said method comprising the step of:
- assembling said flange and said web in order to form a junction section by means of a fusion assembly method, consisting of at least one of the following spot welding, laser welding, seam welding, diffusion welding or brazing.
A method for assembling a girder structure comprising at least one flange and at least one web, said at least one flange being made of at least one first metal with high mechanical resistance, having an elastic limit/breaking load ratio close to 1, and said at least one web being 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,
- the second metal having 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 having 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,
- said method comprising the step of:
- assembling said flange and said web in order to form a junction section by a mechanical assembly method, including rivetting, simple crimping or clinching.
A method for assembling a girder structure comprising at least one flange and at least one web, said at least one flange being made of at least one first metal with high mechanical resistance, having an elastic limit/breaking load ratio close to 1, and said at least one web being 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,
- the second metal having 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 having 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,
- said method comprising the step of:
- assembling said flange and said web in order to form a junction section by hem crimping.
Dependencies are inferred from the claim text.