Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Load bearing wood beam calculator.
The formula for the section modulus is beam width times beam depth squared divided by 6.
Simple beam point load at any location.
Combined axial and bending load calculator.
Uniformly loaded beam overhanging post calculator.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
The properties of the beam and section are specified by typing directly into the input fields.
Rafter and ceiling joist forces.
In beam speak you say.
Steel i beam.
Two point loads at one third points on a simple beam.
Add up all the loads acting on a header or beam and then translate this load into terms of how much load each lineal foot of header or beam will feel.
Area of the cross section is specific to the beam section selected and is defaulted to the values.
This header must carry x pounds per lineal foot.
Simple beam point load at midspan.
The first step is the same for sawn and engineered wood materials.
This translation is the key to any structural sizing.
Calculate the section modulus for the different beams which you could use.
Span calculator for wood joists and rafters also available for the android os.
A two 2 by 6 standard beam has actual dimensions of 1 5 by 5 5 inches which would give a section modulus of 1 5 x 5 5 x 5 5 6 7 6 which is not enough for this example.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
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Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.
Anything 5 and above we always at least double cripple.
Another simple column calculator.
Length of beam is the total including all spans of the beam in mm or ft.
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