MecMovies 4.0 : M15.2: Principal Stresses in a Tee Beam

scene 5 of 14

Compute the location of the centroid in the $y$ direction.

The neutral surface for a bending member occurs at the centroid. Consequently, the location of the centroid must be determined before stress computations can be made.

$\bar{y} = \frac{\sum y_{i} A_{i}}{\sum A_{i}} = \frac{47.30}{6.80} = 6.96 i n .$