Problem Solution

Problem 4.16

Size Categories

Sizes Dimension
Lumber Timbers

Beams &
Stringers Posts &
Timbers

10x10 X

12x14 X

4x16 X

4x4 X

2x10 X

6x12 X

6x8 X

10x14 X

Reference Design Values (psi) for No. 1 DF-L

Property Dimension
Lumber
(Table 4A) Timbers (Table 4D)

Beams &
Stringers Posts &
Timbers

bending stress F_b 1,000 1,350 1,200

tension stress parallel to grain F_t 675 675 825

shear stress parallel to grain F_v 180 170 170

compression stress perpendicular to grain F_c_⊥ 625 625 625

compression stress parallel to grain F_c 1,500 925 1,000

modulus of elasticity (or MOE) E 1,700,000 1,600,000 1,600,000

modulus of elasticity for stability calculations E_min 620,000 580,000 580,000

Sizes	Dimension Lumber	Timbers
Sizes	Dimension Lumber	Beams & Stringers	Posts & Timbers
10x10			X
12x14			X
4x16	X
4x4	X
2x10	X
6x12		X
6x8			X
10x14		X

Property		Dimension Lumber (Table 4A)	Timbers (Table 4D)
Property		Dimension Lumber (Table 4A)	Beams & Stringers	Posts & Timbers
bending stress	F_b	1,000	1,350	1,200
tension stress parallel to grain	F_t	675	675	825
shear stress parallel to grain	F_v	180	170	170
compression stress perpendicular to grain	F_c_⊥	625	625	625
compression stress parallel to grain	F_c	1,500	925	1,000
modulus of elasticity (or MOE)	E	1,700,000	1,600,000	1,600,000
modulus of elasticity for stability calculations	E_min	620,000	580,000	580,000