Supplement - Structural Use Panels - American Wood Council

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38 SUPPLEMENTAL DESIGN ASSISTANCELoad Capacity - DeflectionFrom Table 5.1, the baseline stiffness for Sheathing32/16 is 115 kip-in. 2 /ft. From Table 4.2, the grade-constructionfactor for OSB sheathing stiffness is 1.0. Theend-use adjustment factor is also 1.0. The design stiffnessis:Where(EI)N = (115) (1.0) (1.0)= 115 kip-in. 2 /ftThe design equation is:δ = W L 4 / [K 1(EΙ)N]δ = Deflection criterionL = Clear span plus support-width factor that isequal to 0.25 inch for two-inch-nominal lumberframing and 0.625 inch for four-inch-nominallumber framing.For the example application, K 1 = 1743, K 2 (live load)= 240, K 2 (total load) = 180, and L = 24 - 1.5 + 0.25 =22.75 inches.For uniform roof live load:W L= [115000/(22.75 3 )] (1743/240) = 71 psfTotal uniform load for roof applications:W T= [115000/(22.75 3 )] (1743/180) = 95 psfThe total uniform load limited by the L/180 deflectioncriterion is 95 psf. The uniform roof live load limitedby the L/240 deflection criterion is 71 psf (see Table 7.2).Example SummaryPanel: 1/2-inch nominal OSB Sheathing with a32/16 span rating.Application: Roof - primary axis spanning across supportsspaced 24 inches o.c.K 1= 1743 for three spans, 2220 for two spans, and921.6 for single span applicationsThe deflection criterion term may be expressed as:Limit StateMomentPlanar ShearStiffness, L/240Stiffness, L/180Uniform Load Capacity102 psf204 psf71 psf (live)95 psf (total)δ = L/K 2Where K 2 is a constant (180, 240, or 360).Substituting the deflection criterion term into the designequation and rearranging yields:These values check with capacities provided in thetable of OSB uniform load capacities (Table 7.2) for thecorresponding application. The uniform load capacity forthis design is 71 psf, as governed by the live load deflection.W = [(EΙ)N/L 3 ] (K 1/K 2)APA/EWS
LRFD STRUCTURAL-USE PANELS SUPPLEMENT39SECTIONPROPERTIES8.1 General 408.2 Section and Weight Properties 40Table 8.1 Panel Section and Weight Properties................... 40Table 8.2 Relationship Between Span Rating andNominal Thickness ................................................ 40 8APA/EWS
Page 1: SUPPLEMENTStructural-UsePanelsLRFDL
Page 4 and 5: PrefaceThis supplement contains adj
Page 6 and 7: APA/EWS
Page 8 and 9: 2 DESIGNER FLOWCHART1.1 FlowchartSt
Page 10 and 11: 4 INTRODUCTION2.1 Products Descript
Page 12 and 13: 6 INTRODUCTIONTable 2.1 Typical Pan
Page 15 and 16: GUIDELINELRFD STRUCTURAL-USETO LRFD
Page 17 and 18: LRFD STRUCTURAL-USE PANELS SUPPLEME
Page 24 and 25: 18 FACTORED REFERENCE RESISTANCE5.3
Page 26 and 27: 20FACTORED REFERENCE RESISTANCEAPA/
Page 28 and 29: 22 OTHER CONSIDERATIONS6.1 Fastenin
Page 30 and 31: 24OTHER CONSIDERATIONSAPA/EWS
Page 32 and 33: 26 SUPPLEMENTAL DESIGN ASSISTANCE7.
Page 34 and 35: 28 SUPPLEMENTAL DESIGN ASSISTANCETa
Page 46 and 47: 40 SECTION PROPERTIES8.1 GeneralSec
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Supplement - Structural Use Panels - American Wood Council

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