"Rick" wrote in message ...

wrote in message
s.com...
I have a T beam web 6'-6"x3/8" thick, flange 31.5" x 3/4". The T beam
is 76'-6" long.Let me know if you can help to find the Section
Modulus.

thanks,

Ray


Break the cross section into two rectangles. Find the area of each and y, the distance
their centroids are from the bottom. Multiply the area of each by the y of each. Add
those
up, then divide by the sum of the areas. That gives the centroid of the cross section.

Next, calculate the moments of inertia of each section, then use the parallel axis
transfer theorem to calculate their I at the centroid of the cross section and add them
up.

Now you can calculate the section modulus.

As I recall, that's how we did it in the old days, someone else will tell you the answer
from some computer program shortly!

Must have been one hell of a dumpster you found THAT in!