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In this case, the localised bending stresses that the under-running trolley exerts on the lower flange must be factored into the design of the supporting structure.
Box girders are used in the design of supporting structures when high torsional loads and biaxial bending stresses are anticipated, e.g. in bridge structures and crane construction.
Dabei müssen bei der Tragwerksauslegung die Biegespannungen durch die lokale Unterflanschbiegung der Hängekatze einbezogen werden.