University of Washington
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NDS Supplement
Allowable [pic] Actual?
Analyze actual beam for max moment, shear and deflection
Lumber or gluelam?
Compute allowable bending [pic]and shear [pic]stresses using adjustment factors and Table 4A+ as appropriate : assume CF; if the unsupported length [pic], go thru CL analysis
Set allowable bending stress [pic] equal to actual [pic]and solve for the minimum section modulus required.
Select member size from Table 1B of NDS supplement.
Recalculate [pic] and [pic]
Assume adjustment factors such as CV; check for unsupported lengths for CL analysis: to obtain using Table 5A+ [pic]
Set allowable bending stresses equal to actual values for positive and negative bending to solve for the section modulus required: e.g., [pic]
Lumber
Gluelam
Select member size from Table 1C of NDS supplement.
Recalculate [pic] and check with appropriate fb values.
Calculate shear stresses for a rectangular section:
[pic]
Allowable [pic] Actual?
Allowable [pic] Actual?
Calculate maximum deflection for actual beam using the adjusted modulus of elasticity.
Calculate shear stresses for a rectangular section:
[pic]
Calculate maximum deflection for actual beam using the adjusted modulus of elasticity.
Calculate camber as [pic]
Calculate beam loading from structural loading description.
End
Solve for area required:
[pic]; resize beam
Solve for area required:
[pic]; resize beam
Solve for required moment of inertia; resize beam
Solve for required moment of inertia; resize beam
No
Yes
Yes
Yes
Yes
Yes
no
no
no
no
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