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February 2023 #15283 Page #74
Design of Wood Structures— an Introductory Course
nce again, Virginia Tech will be offering its popular two-day course on topics related to wood construction. This year’s course, to be held on April 26–27, will focus on practical code-conforming design of wood structures based on provisions of the 2018 National Design Specification® (NDS®) for Wood Construction, NDS Supplement, IRC, and IBC.
By Frank Woeste
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Overview of Course Content “Design of Wood Structures—an Introductory Course” will begin with a review of lumber grading methods and stamps, moisture content, sizes, and allowable stresses of species of dimension lumber and timber involved in the structural design process. As an introduction to the design process, building code loads and the rationale for “load combinations” in the code will be discussed and several design examples using load combinations will be presented. Course participants will learn the “design process” by working through the structural design of simple framing elements showing what adjustment factors apply to the tabulated allowable design properties of lumber that apply to a design case. The NDS adjustments for connection design will be reviewed including the impact of moisture content at the time of fabrication and in-service. Common nail connection designs will be demonstrated, and course participants will be given interesting bolt connection details to design with other participants. Participants will be introduced to the 2018 Wood Frame Construction Manual (WFCM) that contains “look-up tables” for design of residential walls, floors, and roofs using ASCE 7–16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures load requirements. After a cursory review of both “Engineered Design” and “Prescriptive Design” provisions in the WFCM, a wall stud design will be demonstrated using the look-up tables in the WFCM. (Note, this column discussed the 2015 edition of WFCM in the January 2018 issue: WFCM—a Valuable Structural Design Guide.) The second day will include a presentation and discussion of the AWC/ICC Code Conforming Wood Design which addresses design of wood structures for fire resistance and height and area allowances for different types of wood construction. This unit has been well received by building design practitioners in previous courses as the instructor will walk the participants through IBC fire resistance requirements based on height, area allowances, and types of construction. Finally, a summary of advances in Tall Mass Timber Structures that are now permitted up to 18-stories by the IBC will be provided. Continued next page
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