Simple Beam, Concentrated Load at Any Point

When specifying a beam or joist three things are usually considered;
First,is the beam strong enough that it doesn't fail by the fibers on the bottom being torn apart, a fiber failure.

Second, is the beam stiff enough that there will not be excessive deflection. A bouncy floor, cracked tile or plaster would be examples of this.

Third, is the beam strong enough that its fibers don't slip past one another, bend a magazine and watch the pages slide past one another. This is a horizontal shear failure.

Point Load on Beam(pounds)
Span of Beam (inches)
Distance from Left Support to Point Load (inches)
Distance from Right Support to Point Load (inches)
Width of Beam
Depth of Beam
Maximum Allowable Fiberstress in Bending (PSI)
Modulus of Elasticity (million PSI)
Maximum Allowable Horizontal Shear (PSI)
Click Here to download the NDS Supplement of Wood Design Values
Fiberstress in Bending Deflection Horizontal Shear
Max Moment (ft-lbs) Deflection (inches) Shear in Left Side of Beam (PSI)
Section Modulus Required Max 1/360 (Floor) Shear Pass/Fail, Left
Section Modulus Input Max 1/240 (Roof) Shear in Right Side of Beam (PSI)
Section Modulus Pass/Fail Deflection Pass/Fail Shear Pass/Fail, Right
Support Reaction, Left Support Reaction, Right

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