## Hybrid Bridge Girders

Computation of bending stresses and allowable stresses is generally the same as that for girders with uniform yield strength. The bending stress in the web, however, may exceed the allowable bending stress if the computed flange bending stress does not exceed the allowable stress multiplied by

where

α  = ratio of web yield strength to flange yield strength
ψ = distance from outer edge of tension flange or bottom flange of
orthotropic deck to neutral axis divided by depth of steel section

β = ratio of web area to area of tension flange or bottom flange of
orthotropic-plate bridge