In standard Eurocode 4 part 1 shows how to calculate the combined structure is manufactured from steel grades S235, S275 and S355 normally (the numbers denote flow limit N/mm2) defined in standard EN 10025 and EN 10113. To have the standard value of the limited flows fy and definitive pull strength fu of the hot-rolled structures depends on the thickness, is given in table 2.6.
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