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S246
Determining Allowable Design Values for Wood

Richard E. Nolan , PE

Safe design of wood components, such as beams, headers, floor joists, etc. requires the proper determination of design values. Reference design values that are listed among many sources need to be adjusted either upwards or downwards depending on the intended service, loading and support conditions of the wood. This course provides prescriptive guidance on how to determine allowable design values for wood. The methodology taught in this course is based on the National Design Specification for Wood Construction (NDSWC) published by the American Forest & Paper Association and the American Wood Council which is a recognized standard for designing wood dwellings. It is not necessary to acquire the NDSWC but it would be a valuable reference to have and would provide further insight into the course.

This course demonstrates how to adjust the reference design values for the most significant factors. Methods for determining all the significant types of design values for wood will be discussed which include bending, shear, compression (parallel & perpendicular to the grain), tension and deflection. Some of the major factors affecting the design values that will be explained include moisture content, temperature, beam stability, column stability, load duration, repetitive factor, etc. Narration and pictures are provided on some of the slides to expound on the printed information. Realistic examples are included at the end of the slides that show how to size a header and determine the required number of header supports.

This course includes a multiple-choice quiz at the end which is designed to enhance the understanding of the course material.


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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.

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