Max allowable deflection l 360 floor sx required.
W steel beam allowable uniform load.
36 or 50.
W steel beams allowable uniform loads allowable uniform loads.
Span of beam inches tributary width inches uniform load pounds square foot e g.
At these measurements there is no allowable load for a beam with a span greater than 18 feet.
As the span increases the allowable uniform load drops.
Yield strength of steel ksi e g.
For example a beam with a designation of w8 x 10 and nominal size of 8 x 4 can take an allowable load of anywhere between 6 900 and 15 600 pounds depending on the span of the beam.
Allowable uniform load lbs span ft 8.
Example beam with uniform load imperial units.
Total load on beam.
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Nominal size designation depth x width x width lbs ft inches x inches w8 x 10 8x4 w8 x 13 8x4 w8 x 15 8x4 w8 x 18 8 x 5 1 2 w8 x 21 8 x 5 1 2 w8 x 24 8 x 6 1 2 w8 x 28 8 x 6 1 2 w10 x 22 10 x 5 3 4 w10 x 26 10 x 5 3 4 w10 x 30 10 x 5 3 4.
The maximum stress in a w 12 x 35 steel wide flange beam 100 inches long moment of inertia 285 in 4 modulus of elasticity 29000000 psi with uniform load 100 lb in can be calculated as.
W flange beams and allowable uniform load.
σ max y max q l 2 8 i 6 25 in 100 lb in 100 in 2 8 285 in 4 2741 lb in 2 psi the maximum deflection can be calculated as.
Designation width x lbs ft nominal size depth x width inches x inches allowable uniform load lb span ft 8 10 12 14 16 18 20 22 24 26.