Live support chatLumber Stress Grades and Design Properties
In Lumber Stress Grades and Design Properties , you'll learn ...
- Sorting criterion and derivation of mechanical strength properties for visually graded structural lumber
- The difference between machine-stress-rated (MSR) lumber and machine-evaluated-lumber (MEL)
- Adjustment of lumber properties, such as modulus of elasticity, for design use
- Standards governing allowable strength properties for wooden piles and poles
Overview
Preview a portion of this course before purchasing it.
Credit: 2 PDH
Length: 18 pages
Lumber sawn from a log, regardless of species and size, is quite variable in mechanical properties. Pieces of lumber sawn from the same log may differ in strength by several hundred percent. For ease of use, lumber with the same mechanical properties are placed in categories, commonly known as stress grades.
This course will provide you with an understanding of how lumber is graded and how the mechanical properties can be adjusted for design use.
Learning Objectives
Upon completion of this course, participants will be able to:
- Explain the responsibilities and standards associated with stress grading lumber.
- Identify typical sorting criteria for visually graded lumber, including knots, slope of grain, splits, shake, density, and decay.
- Describe the approval process for accepting design values for foreign lumber species.
- Explain the procedures for deriving the mechanical strength properties of visually graded lumber.
- Distinguish between machine stress-rated (MSR) and machine-evaluated lumber (MEL).
- Identify the basic components of a machine grading system for lumber.
- Explain how modulus of elasticity values are derived for machine-graded lumber.
- Describe the development of allowable tensile, compression, bending, and shear stress values.
- Explain how the mechanical properties associated with lumber quality are adjusted for engineering use.
- Describe how load duration affects design stress values for lumber.
- Explain how allowable strength properties are derived for round timber and ties.
Certificate of Completion
You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 10 questions. PDH credits are not awarded until the course is completed and quiz is passed.
| This course is applicable to professional engineers in: | ||
| Alabama (P.E.) | Alaska (P.E.) | Arkansas (P.E.) |
| Delaware (P.E.) | District of Columbia (P.E.) | Florida (P.E. Area of Practice) |
| Georgia (P.E.) | Idaho (P.E.) | Illinois (P.E.) |
| Illinois (S.E.) | Indiana (P.E.) | Iowa (P.E.) |
| Kansas (P.E.) | Kentucky (P.E.) | Louisiana (P.E.) |
| Maine (P.E.) | Maryland (P.E.) | Michigan (P.E.) |
| Minnesota (P.E.) | Mississippi (P.E.) | Missouri (P.E.) |
| Montana (P.E.) | Nebraska (P.E.) | Nevada (P.E.) |
| New Hampshire (P.E.) | New Jersey (P.E.) | New Mexico (P.E.) |
| New York (P.E.) | North Carolina (P.E.) | North Dakota (P.E.) |
| Ohio (P.E. Self-Paced) | Oklahoma (P.E.) | Oregon (P.E.) |
| Pennsylvania (P.E.) | South Carolina (P.E.) | South Dakota (P.E.) |
| Tennessee (P.E.) | Texas (P.E.) | Utah (P.E.) |
| Vermont (P.E.) | Virginia (P.E.) | West Virginia (P.E.) |
| Wisconsin (P.E.) | Wyoming (P.E.) | |
Preview a portion of this course before purchasing it.
Credit: 2 PDH
Length: 18 pages
