Looking for structural steel beam size requirements for clear span.?

Question

Hi, I would like to build a milling shed with a clear span on the front side. building is 40' long, 20 feet deep, and will have 6' cantilevered roof off the front side. snow load is 36 psf, 1/50 hourly wind pressure 0.39 kpa. roof pitch 4/12.

thank you

Answer 1

This is an example of a Steel beam span length.  This shows you how to calcualte the effective span length of the beam, the distance from the centre of one end bearing to the centre of the other end bearing. 

For example, if the clear distance between supports is 3m and the beam has a minimum end bearing length of 0.1m at both ends, you will calculate the effective span length as follows: 

 3m + 0.1m/2 + 0.1m/2 = 3.1m

Answer 2

For a 40’ long, 20’ deep shed with a 6’ cantilever roof, you will need two steel beams. The beams should be W10x30 or larger, depending on the specific load requirements for this project. The beam should be placed along the 20’ depth at a maximum span of 30’ per beam. A W14x109 or W14x120 beam should be used for the 40’ span along the length of the shed. Both beams should be placed at the top of the shed walls with the cantilever roof overhanging the front of the shed.