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
Keep the rectangular shape of the bridge cross-section
Transfer load from top of end posts to bearings

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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

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

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