1996 LRFD Supplements - unprotected PDF - American Wood Council

GUIDELINELRFDTOSTRUCTURALLRFD FOR STRUCTURALLUMBER SUPPLEMENTCOMPOSITE LUMBER2727Table 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)BALSAM FIRSelect 2"-4" thick -- 4.19 -- 1500 NELMACommercial 4"-12" wide -- 3.56 -- 1300COAST SITKA SPRUCESelect 2"-4" thick 3.18 3.65 0.95 1700 NLGACommercial 6" & wider 2.67 3.07 0.95 1500COAST SPECIESSelect 2"-4" thick 3.18 3.65 0.77 1500 NLGACommercial 6" & wider 2.67 3.07 0.77 1400DOUGLAS FIR-LARCHSelect Dex 2"-4" thick 4.45 5.11 1.30 1800 WCLIBCommercial Dex 6"-8" wide 3.68 4.24 1.30 1700Selected 2"-4" thick 4.45 5.11 1.30 1800 WWPACommercial 4"-12" wide 3.68 4.24 1.30 1700DOUGLAS FIR-LARCH (NORTH)Select 2"-4" thick 4.45 5.11 1.30 1800 NLGACommercial 6" & wider 3.68 4.24 1.30 1700DOUGLAS FIR-SOUTHSelected 2"-4" thick 4.45 5.11 1.08 1400 WWPACommercial 4"-12" wide 3.56 4.09 1.08 1300EASTERN HEMLOCK-TAMARACKSelect 2"-4" thick -- 4.32 -- 1300 NELMACommercial 4"-12" wide -- 3.68 -- 1100EASTERN HEMLOCK-TAMARACK (NORTH)Select 2"-4" thick 3.81 4.38 1.15 1300 NLGACommercial 6" & wider 3.18 3.65 1.15 1100EASTERN SPRUCESelect 2"-4" thick -- 3.30 -- 1500 NELMACommercial 4"-12" wide -- 2.79 -- 1400EASTERN WHITE PINESelect 2"-4" thick -- 3.30 -- 1200 NELMACommercial 4"-12" wide -- 2.79 -- 1100EASTERN WHITE PINE (NORTH)Select 2"-4" thick 2.29 2.63 0.73 1200 NLGACommercial 6" & wider 1.97 2.26 0.73 1100HEM-FIRSelect Dex 2"-4" thick 3.56 4.09 0.84 1500 WCLIBCommercial Dex 6"-8" wide 2.92 3.36 0.84 1400Selected 2"-4" thick 3.56 4.09 0.84 1500 WWPACommercial 4"-12" wide 2.92 3.36 0.84 1400HEM-FIR (NORTH)Select 2"-4" thick 3.43 3.94 0.77 1500 NLGACommercial 6" & wider 2.79 3.21 0.77 14003REFERENCE STRENGTHS