Sheet metal carrier

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As plate girders in are structural steel composite plate girders or box girder made of steel (usually welded, screwed rarer, earlier often riveted), respectively. In contrast to rolled girders (steel girders made of profile steel ), which are made from a piece of steel, the dimensions of sheet metal girders (sheet thickness, height of the sheet metal wall, width of the belt plates) can be chosen more freely.

The limits of the dimensions are specified in the structural analysis. Evidence of structural safety and usability must be provided. To prove the structural safety , the limit states customary in statics must be examined. This includes the exhaustion of the load-bearing capacities of the cross-section and the connections (weld seams, screws, rivets) and the stability failure of the components or failure as a result of fatigue stress.

Sheet metal girders can often be made lighter than rolled girders, but due to the connections and the stiffening elements (stiffeners, ribs) required depending on the thinness of the components, they require more machining.

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