## Timber & Wood Design Examples

Tension Members

**Example 1 - Analyzing a tension sawn lumber member subjected to dead and snow loads per NDS 2012**

Calculate the actual and allowable tensile stress parallel to the grain of the tension member given the following parameters:

Wood Type - No. 3 Hem-Fir

Wood Size - 2 x 8, dressed

Tensile Force - Dead + Snow Load, 5000 lbs

Moisture Content - >19%

Temperature - Normal

The tension member has a row of 5/8" diameter bolts with 1/8" oversized holes

**Example 2 - Analyzing a tension glulam member subjected to dead and snow loads per NDS 2012**

Calculate the actual and allowable tensile stress parallel to the grain of the tension member given the following parameters:

Wood Type - Glulam Axial Combination 5DF

Wood Size - 2 1/2 x 6 (net finished dimensions)

Tensile Force - Dead + Snow Load, 10000 lbs

Moisture Content - >16%

Temperature - Normal

The tension member has a row of 5/8" diameter bolts with 1/8" oversized holes

**Example 4 - Analyzing a glulam member subjected to tensile force plus bending moment per NDS 2012**

Check the adequacy of the member given the following parameters:

Wood Type - Glulam Axial Combination 3DF

Wood Size - 5 1/8" x 10 1/2"

Tensile Force - 40000 lbs

Bending Moment - 80000 lbs-in

Moisture Content - Dry

Temperature - Normal

Load Duration Factor - 1.0

Span Length - 30 ft

Lateral supports provided at the member ends only, loading is due to uniformly distributed load

Flexural Beam Members

**Example 1 - Analyzing a deck beam subjected to dead and snow loads per NDS 2012**

Check the adequacy of the simply supported deck beam loaded on its narrow face given the following parameters:

Wood Type - No 1 Douglas fir-larch

Wood Size - 2 x 8, dressed

Bracing - Adequately braced to prevent lateral torsional buckling

Dead Load - 15 lbs/ft^2

Snow Load - 20 lbs/ft^2

Moisture Content - >19%

Temperature - Normal

Span Length - 15 ft

Deck Beam Spacing - 1.5 ft

**Example 2 - Analyzing a tension glulam member subjected to dead and snow loads per NDS 2012**

Calculate the allowable stress values per NDS of the beam given the following parameters:

Wood Type - Select Structural Red Oak

Wood Size - 6 x 10, full sawn

Load Type - dead, live, snow, wind (loading on narrow face)

Bracing - Adequately braced to prevent lateral torsional buckling

Moisture Content - Dry

Temperature - Normal