Problem Solution

Problem 8.28

Given

find adjusted capacities per unit foot width

15/32 in.-thick OSB (assume C_G = 1; it is not Structural I)

32/16 span rating

dry conditions (C_M = 1)

at least 24-in. wide (C_s = 1)

(1.2D + 1.6L) load (assume floor applications; C_D = 1 for L)

From ASD/LFRD Manual chapter M9

Also available in NDS table 9.3.1.

ASD Adjustments

See NDS commentary C9.3 or APA Panel Design Specification for adjustment factors.

Capacity Symbol ASD/LRFD
Manual Table APA Panel Design
Specification Table Unadjusted Value for
Strong/Weak Orientation Unit C_D C_M C_t C_G C_s Adjusted Value for
Strong/Weak Orientation

PANEL BENDING STRENGTH F_bS M9.2-1 8 445
165 lb-in./ft
of panel width 1 1 1 1 1 445
165

PANEL AXIAL TENSION F_tA M9.2-2 8 2,800
1,650 lb/ft
of panel width 1 1 1 1 1 2,800
1,650

PANEL THROUGH-THE-THICKNESS SHEAR F_vt_v M9.2-4 8 180
180 lb/in. of shear-
resisting panel length 1 1 1 1 180
180

PANEL SHEAR-IN-THE-PLANE F_s(Ib/Q) M9.2-3 8 165
165 lb/ft
of panel width 1 1 1 1 165
165

PANEL AXIAL COMPRESSION F_cA M9.2-1 8 3,550
3,100 lb/ft
of panel width 1 1 1 1 3,550
3,100

PANEL BENDING STIFFNESS EI M9.2-1 8 115,000
25,000 lb-in.²/ft
of panel width 1 1 1 115,000
25,000

PANEL AXIAL STIFFNESS EA M9.2-1 8 4,150,000
3,600,000 lb/ft
of panel width 1 1 1 4,150,000
3,600,000

PANEL RIGIDITY THROUGH-THE-THICKNESS G_vt_v M9.2-4 8 83,500
83,500 lb/in.
of panel depth 1 1 1 83,500
83,500

PANEL COMPRESSION PERPENDICULAR TO FACE F_c_⊥ ? ? ? psf 1 1 1 ?

Capacity	Symbol	ASD/LRFD Manual Table	APA Panel Design Specification Table	Unadjusted Value for Strong/Weak Orientation	Unit	C_D	C_M	C_t	C_G	C_s	Adjusted Value for Strong/Weak Orientation
PANEL BENDING STRENGTH	F_bS	M9.2-1	8	445 165	lb-in./ft of panel width	1	1	1	1	1	445 165
PANEL AXIAL TENSION	F_tA	M9.2-2	8	2,800 1,650	lb/ft of panel width	1	1	1	1	1	2,800 1,650
PANEL THROUGH-THE-THICKNESS SHEAR	F_vt_v	M9.2-4	8	180 180	lb/in. of shear- resisting panel length	1	1	1	1		180 180
PANEL SHEAR-IN-THE-PLANE	F_s(Ib/Q)	M9.2-3	8	165 165	lb/ft of panel width	1	1	1	1		165 165
PANEL AXIAL COMPRESSION	F_cA	M9.2-1	8	3,550 3,100	lb/ft of panel width	1	1	1	1		3,550 3,100
PANEL BENDING STIFFNESS	EI	M9.2-1	8	115,000 25,000	lb-in.²/ft of panel width		1	1	1		115,000 25,000
PANEL AXIAL STIFFNESS	EA	M9.2-1	8	4,150,000 3,600,000	lb/ft of panel width		1	1	1		4,150,000 3,600,000
PANEL RIGIDITY THROUGH-THE-THICKNESS	G_vt_v	M9.2-4	8	83,500 83,500	lb/in. of panel depth		1	1	1		83,500 83,500
PANEL COMPRESSION PERPENDICULAR TO FACE	F_c_⊥	?	?	?	psf		1	1	1		?