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Wood- Lumber stress grade & Design
Credit: 2 PDH
Course Fee: $30.00
15 pages
Course Summary:
This course briefly discusses the U.S. Department of Commerce American Softwood Lumber Standard PS20 (1994) sorting criteria for two stress-grading methods, and the philosophy of how properties for engineering design are derived. The derived properties are then used in one of two design formats: (a) the load and resistance factor design (LRFD), which is based on a reference strength at the 5th percentile 5-min bending stress (AF&PA 1996), or (b) the allowable stress design (ASD), which is based on a design stress at the lower 5th percentile 10-year bending stress. The properties depend on the particular sorting criteria and on additional factors that are independent of the sorting criteria.
Learning Objective:
- Responsibilities and Standards for Stress Grading
- National Grading Rule
- Visually Graded Structural Lumber
- Visual Sorting Criteria
- Procedures for Deriving Design Properties
- Machine-Graded Structural Lumber
- Machine Sorting Criteria
- Procedures for Deriving Design Properties
- Quality Control
- Adjustment of Properties for Design Use
- Shrinkage
- Moisture Adjustments
- Treatment Effects
- Temperature Effects
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