transfer load from top of end posts to bearings

keep the rectangular shape of the bridge cross-section

stiffen the structure laterally

prevent the sidesway buckling of top chord

2Vi % of the top panel wind load to bottom bracing

10% of the top panel wind load to bottom bracing

25% of the top panel wind load to bottom bracing

50% of the top panel wind load to bottom bracing

only (i)

both (i) and (ii)

both (i) and (iii)

all (i), (ii) and (iii)

sway bracing

portal bracing

top lateral bracing

bottom lateral bracing

bearing and shear

bending and shear

bearing and bending

bearing, shear and bending