Design of Steel Structure
The portal bracing in a truss bridge is used to

Prevent the sides-way buckling of top chord
Stiffen the structure laterally
Transfer load from top of end posts to bearings
Keep the rectangular shape of the bridge cross-section

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Design of Steel Structure
In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate

Fully through fastenings
50% by direct bearing and 50% through fastenings
Fully by direct bearing
75% by direct bearing and 25% through fastenings

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