1996 LRFD Supplements - unprotected PDF - American Wood Council

GUIDELINELRFDTOSTRUCTURALLRFD FOR STRUCTURALLUMBER SUPPLEMENTCOMPOSITE LUMBER 21 21Table 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)MIXED MAPLESelect Structural Beams and 2.92 1.89 0.26 1.29 1.74 670 1100No. 1 Stringers 2.48 1.35 0.26 1.29 1.44 670 1100No. 2 1.59 0.88 0.26 1.29 0.90 550 900 NELMASelect Structural Posts and 2.79 1.96 0.26 1.29 1.80 670 1100No. 1 Timbers 2.22 1.62 0.26 1.29 1.56 670 1100No. 2 1.27 0.95 0.26 1.29 0.72 550 900MIXED OAKSelect Structural Beams and 3.43 2.16 0.23 1.66 1.98 610 1000No. 1 Stringers 2.92 1.49 0.23 1.66 1.68 610 1000No. 2 1.84 1.01 0.23 1.66 1.08 490 800 NELMASelect Structural Posts and 3.18 2.30 0.23 1.66 2.10 610 1000No. 1 Timbers 2.54 1.82 0.23 1.66 1.86 610 1000No. 2 1.46 1.08 0.23 1.66 0.84 490 800MIXED SOUTHERN PINE(wet use)Select Structural 5" x 5" 3.81 2.70 0.32 0.78 2.16 790 1300No. 1 and 3.43 2.43 0.32 0.78 1.92 790 1300 SPIBNo. 2 Larger 2.16 1.49 0.27 0.78 1.26 610 1000MOUNTAIN HEMLOCKSelect Structural Beams and 3.43 2.09 0.24 1.19 2.10 670 1100No. 1 Stringers 2.79 1.49 0.24 1.19 1.74 670 1100No. 2 1.84 1.01 0.24 1.19 1.14 550 900 WCLIBSelect Structural Posts and 3.18 2.23 0.24 1.19 2.22 670 1100No. 1 Timbers 2.54 1.82 0.24 1.19 1.92 670 1100No. 2 1.59 1.08 0.24 1.19 1.32 550 900NORTHERN PINESelect Structural Beams and 3.18 2.30 0.19 0.90 2.04 790 1300No. 1 Stringers 2.67 1.89 0.19 0.90 1.74 790 1300No. 2 1.71 0.95 0.19 0.90 1.08 610 1000 NELMASelect Structural Posts and 2.92 2.16 0.19 0.90 2.16 790 1300 NSLBNo. 1 Timbers 2.41 1.76 0.19 0.90 1.92 790 1300No. 2 1.40 1.01 0.19 0.90 0.90 610 1000NORTHERN RED OAKSelect Structural Beams and 4.06 2.57 0.30 1.84 2.28 790 1300No. 1 Stringers 3.43 1.82 0.30 1.84 1.92 790 1300No. 2 2.22 1.15 0.30 1.84 1.20 610 1000 NELMASelect Structural Posts and 3.81 2.70 0.30 1.84 2.40 790 1300No. 1 Timbers 3.05 2.16 0.30 1.84 2.10 790 1300No. 2 1.78 1.28 0.30 1.84 0.96 610 10003REFERENCE STRENGTHS