The picture shows the load and cross-section of the bridge girder. The material is S355.

a) Where is the critical cross-section of the structure at the fracture limit.

b) Where is the critical cross-section of the structure in serviceability limit state dimensioning.

c) Which cross section class does the beam belong to.

d) What type is the maximum permissible stress of the beam (e.g. yield strength?).

e) Strengthen the cross-section by thickening the plate so that the cross-section all parts are in the same cross-section class.

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