Credit: 2 PDH
Course Fee: $35.00
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:

By the end of this course the participant will learn:

1. Responsibilities and Standards for Stress Grading
2. National Grading Rule
3. Visually Graded Structural Lumber
4. Visual Sorting Criteria
5. Procedures for Deriving Design Properties
6. Machine-Graded Structural Lumber
7. Machine Sorting Criteria
8. Procedures for Deriving Design Properties
9. Quality Control
10. Adjustment of Properties for Design Use
11. Shrinkage
12. Moisture Adjustments
13. Treatment Effects
14. Temperature Effects
15. This document is free to download. The quiz is also free to download and take as many times as the participant wants until passed before purchase.

Review the quiz before studying the course.

Course Author: US Forest Service

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