Fifty Per Cent of Reversal Stress Added to Main Stress.

Seventy-five Per Cent of Reversal Stress Added to Main Stress.

Warren System, Single or Double-Cancellation, with Verticals.

Effect of Live Load Reversal Neglected,

Fifty Per Cent of Reversal Stress Added to Main Stress.

Seventy-five Per Cent of Reversal Stress Added to Main Stress.

Notation.

l = Main span length in feet;

d = Depth of stiffening truss in feet;

p = Panel length of stiffening truss in feet;

t = Transverse distance between chords carrying wind stresses;

L = Live load in pounds per lineal foot of truss;

w = Transverse wind load in pounds per lineal foot of bridge;

s = Working stress in tension, in pounds per square inch;

Wc, = Weight of one chord in pounds per lineal foot;

Ww = Weight of web members in pounds per lineal foot of truss.

Main Cables.

Weights:

For r/l=1/9          sec B=1.094          l'/l=1.032