1996 LRFD Supplements - unprotected PDF - American Wood Council

GUIDELINELRFDTOSTRUCTURALLRFD FOR STRUCTURALLUMBER SUPPLEMENTCOMPOSITE LUMBER 1919Table 3.3Reference Strengths for Visually Graded Timbers (5" x 5" and Larger)Design values in kips per square inch (ksi)Tension 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)DOUGLAS FIR-LARCHDense Sel. Struct. 4.45 3.11 0.24 1.52 3.24 1030 1700Select Structural Posts and 3.81 2.70 0.24 1.30 2.76 970 1600Dense No. 1 Timbers 3.56 2.57 0.24 1.52 2.88 1030 1700 WWPANo. 1 3.05 2.23 0.24 1.30 2.40 970 1600Dense No. 2 2.03 1.49 0.24 1.52 1.32 850 1400No. 2 1.78 1.28 0.24 1.30 1.14 790 1300DOUGLAS FIR-LARCH (NORTH)Select Structural Beams and 4.06 2.57 0.24 1.30 2.64 970 1600No. 1 Stringers 3.30 1.82 0.24 1.30 2.22 970 1600No. 2 2.22 1.15 0.24 1.30 1.44 790 1300 NLGASelect Structural Posts and 3.81 2.70 0.24 1.30 2.76 970 1600No. 1 Timbers 3.05 2.23 0.24 1.30 2.40 970 1600No. 2 1.84 1.28 0.24 1.30 1.68 790 1300DOUGLAS FIR-SOUTHSelect Structural Beams and 3.94 2.43 0.24 1.08 2.40 730 1200No. 1 Stringers 3.30 1.69 0.24 1.08 2.04 730 1200No. 2 2.10 1.15 0.24 1.08 1.26 610 1000 WWPASelect Structural Posts and 3.56 2.57 0.24 1.08 2.52 730 1200No. 1 Timbers 2.92 2.09 0.24 1.08 2.22 730 1200No. 2 1.65 1.08 0.24 1.08 1.02 610 1000EASTERN HEMLOCKSelect Structural Beams and 3.43 2.50 0.23 1.14 2.28 730 1200No. 1 Stringers 2.92 2.09 0.23 1.14 1.92 730 1200 NELMANo. 2 1.91 1.01 0.23 1.14 1.32 550 900 NSLBSelect Structural Posts and 3.18 2.30 0.23 1.14 2.40 730 1200No. 1 Timbers 2.67 1.89 0.23 1.14 2.10 730 1200No. 2 1.52 1.08 0.23 1.14 0.96 550 900EASTERN HEMLOCK-TAMARACKSelect Structural Beams and 3.56 2.50 0.23 1.15 2.28 730 1200No. 1 Stringers 2.92 2.09 0.23 1.15 1.92 730 1200 NELMANo. 2 1.91 1.01 0.23 1.15 1.20 550 900 NSLBSelect Structural Posts and 3.30 2.36 0.23 1.15 2.40 730 1200No. 1 Timbers 2.67 1.89 0.23 1.15 2.10 730 1200No. 2 1.52 1.08 0.23 1.15 0.96 550 9003REFERENCE STRENGTHS