Description

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1.  Mechanical Properties of Structural Composite Lumber
Key Parameters:
• Structural Composite Lumber Bending Strength: ≥ 2.10 × characteristic value
• Structural Composite Lumber Tensile Strength Parallel to Grain: ≥ 2.10 × characteristic value
• Structural Composite Lumber Compressive Strength Parallel to Grain: ≥ 1.90 × characteristic value
• Structural Composite Lumber Shear Strength: ≥ 3.15 × characteristic value
• Structural Composite Lumber Modulus of Elasticity: 1.00 (no adjustment)
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2. Design Standard for Structural Composite Lumber (ASTM D5456)
Key Parameters:
•Structural Composite Lumber  Standard: ASTM D5456-21e01
• Structural Composite Lumber Scope: Applies to dry service conditions (moisture content < 16%)
• Structural Composite Lumber Required Tests: Bending, tension, compression, shear, bond durability, etc.
• Structural Composite Lumber Adjustment Factors: Based on product type and volume
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3. Volume Factor and Stability Considerations for SCL Members
Key Parameters:
• Structural Composite Lumber Volume Factor (Cv):
•Structural Composite Lumber  For shallow members (d ≤ 12"): Cv = (12/d)^(1/m1)
•Structural Composite Lumber  For deep members (d > 12"): Cv = (12/d)^(1/m2)
•Structural Composite Lumber  Column Stability Factor (CP): c = 0.9 for SCL
• Structural Composite Lumber Beam Stability Factor (CL): Determined per NDS 3.3.3
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4. Quality Assurance and Characteristic Value Determination for SCL
Key Parameters:
•Structural Composite Lumber  Characteristic Values: Derived from test data per ASTM D5456
•Structural Composite Lumber  Design Stress: Adjusted using factors in Table 1 of ASTM D5456
• Structural Composite Lumber Quality Control: Required for each production facility independently
• Structural Composite Lumber Certification: Must be conducted by an independent qualifying agency
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