1996 LRFD Supplements - unprotected PDF - American Wood Council

GUIDELINELRFDTOSTRUCTURALLRFD FOR STRUCTURALLUMBER SUPPLEMENTCOMPOSITE LUMBER 29 29Table 3.5Reference Strengths for Visually Graded DeckingDesign values in kips per square inch (ksi) 1Compression ModulusBending perpendicular of GradingSpecies and Size Single Repetitive to grain Elasticity Rulescommercial grade Classification Member Member E AgencyF b C r F b F c β (mean)SPRUCE-PINE-FIRSelect 2"-4" thick 3.05 3.51 0.88 1500 NLGACommercial 6" & wider 2.54 2.92 0.88 1300SPRUCE-PINE-FIR (SOUTH)Selected 2"-4" thick 2.92 3.36 0.70 1400 NELMACommercial 4"-12" wide 2.41 2.77 0.70 1200 WWPAWESTERN CEDARSSelect Dex 2"-4" thick 3.18 3.65 0.88 1100 WCLIBCommercial Dex 6" -8" wide 2.67 3.07 0.88 1000Selected 2"-4" thick 3.18 3.65 0.88 1100 WWPACommercial 4"-12" wide 2.67 3.07 0.88 1000WESTERN CEDARS (NORTH)Select 2"-4" thick 3.05 3.51 0.88 1100 NLGACommercial 6" & wider 2.67 3.07 0.88 1000WESTERN HEMLOCKSelect 2"-4" thick 3.81 4.38 0.85 1600 WCLIBCommercial 6" -8" wide 3.30 3.80 0.85 1400WESTERN HEMLOCK (NORTH)Select, close grain 2"-4" thick 3.81 4.38 0.85 1600 NLGASelect 6" & wider 3.30 3.80 0.85 1400WESTERN WHITE PINESelect 2"-4" thick 2.79 3.21 0.78 1400 NLGACommercial 6" & wider 2.35 2.70 0.78 1300WESTERN WOODSSelected 2"-4" thick 2.92 3.36 0.70 1200 WWPACommercial 6" & wider 2.41 2.77 0.70 11003REFERENCE STRENGTHS1 Bending values are tabulated for a 4" member thickness. Multiply the bending value by the flat use factor (Table 4.5) for2" and 3" thick decking.