Need Help Calculating Section Modulus 1

[Lugo331]

I am working on two beam comparisons. The first is a "C" channel shape, 16" tall, 4" flange, 3" return, and .250 wall thickness. The second beam is fabricated from structural steel tubing 5 x 3 x .188 with the 5" leg being vertical on the top and the bottom. The distance between the upper and lower beam is 12" and a series of angular welded tubing is what holds the two together. Thank you, Paul

 

[jdgengineer]

1) Calculate the centriod of the built-up section

2) Calculate the moment of inertia built-up section

3) Determine the distance from the centroid to the extreme tension/compression fibers.

4) S = I / c

 

[rb1957]

i think you're comparing a 16" C channel with a built up beam.

the built up beam section looks like 2 tubes (neglect the tubing joining them together)

calculating I for the two tubes is easy enough, offset some 12" apart; yes?

c = 6" (symmetric section)

Z = I/c

Quando Omni Flunkus Moritati

 

[msquared48]

Or you could use "Shapebuilder".

Mike McCann
MMC Engineering