1996 LRFD Supplements - unprotected PDF - American Wood Council

GUIDELINELRFDTOSTRUCTURALLRFD FOR STRUCTURALLUMBER SUPPLEMENTCOMPOSITE LUMBER 9Table 3.2Reference Strengths for Visually Graded Dimension LumberDesign values in kips per square inch (ksi) 1Tension Shear Compression Compression ModulusBending parallel parallel perpendicular parallel of GradingSpecies and Size to grain to grain to grain to grain Elasticity Rulescommercial grade Classification E 05 E AgencyF b F t F v F c β F c (5th pct) (mean)ASPENSelect Structural 2.22 1.35 0.17 0.55 1.74 670 1100No. 1 2"-4" thick 1.59 1.01 0.17 0.55 1.44 670 1100 NELMANo. 2 1.52 0.95 0.17 0.55 1.08 610 1000 NLSBNo. 3 2" & wider 0.89 0.54 0.17 0.55 0.66 550 900 WWPAStud 1.21 0.74 0.17 0.55 0.72 550 900Construction 2"-4" thick 1.78 1.08 0.17 0.55 1.50 550 900Standard 0.95 0.61 0.17 0.55 1.14 550 900Utility 2"-4" wide 0.44 0.27 0.17 0.55 0.72 490 800BEECH-BIRCH-HICKORYSelect Structural 3.68 2.30 0.29 1.49 2.88 1030 1700No. 1 2"-4" thick 2.67 1.62 0.29 1.49 2.28 970 1600No. 2 2.54 1.62 0.29 1.49 1.80 910 1500No. 3 2" & wider 1.46 0.95 0.29 1.49 1.02 790 1300 NELMAStud 1.97 1.22 0.29 1.49 1.14 790 1300Construction 2"-4" thick 2.92 1.82 0.29 1.49 2.40 850 1400Standard 1.65 1.01 0.29 1.49 1.86 790 1300Utility 2"-4" wide 0.76 0.47 0.29 1.49 1.20 730 1200COTTONWOODSelect Structural 2.22 1.42 0.19 0.67 1.86 730 1200No. 1 2"-4" thick 1.59 1.01 0.19 0.67 1.50 730 1200No. 2 1.59 0.95 0.19 0.67 1.14 670 1100No. 3 2" & wider 0.89 0.54 0.19 0.67 0.66 610 1000 NSLBStud 1.21 0.74 0.19 0.67 0.72 610 1000Construction 2"-4" thick 1.78 1.08 0.19 0.67 1.56 610 1000Standard 1.02 0.61 0.19 0.67 1.20 550 900Utility 2"-4" wide 0.44 0.27 0.19 0.67 0.78 550 900DOUGLAS FIR-LARCHSelect Structural 2"-4" thick 3.68 2.70 0.27 1.30 4.08 1150 1900No. 1 & Btr 2.92 2.09 0.27 1.30 3.60 1090 1800No. 1 2" & wider 2.54 1.82 0.27 1.30 3.48 1030 1700No. 2 2.22 1.55 0.27 1.30 3.12 970 1600 WCLIBNo. 3 1.27 0.88 0.27 1.30 1.80 850 1400 WWPAStud 1.71 1.22 0.27 1.30 1.98 850 1400Construction 2"-4" thick 2.54 1.76 0.27 1.30 3.84 910 1500Standard 1.40 1.01 0.27 1.30 3.24 850 1400Utility 2"-4" wide 0.70 0.47 0.27 1.30 2.10 790 13003REFERENCE STRENGTHS