Dr. Gary Anderson, PhD

Diaphragm Design: Moving Toward a More Accurate Model

Wednesday, March 6 from 7:30–8:30 am


Learn about diaphragm components—roof sheathing, roof sheathing purlins and associated fasteners, purlin-rafter connections, and frame—and their interactions. The presentation will cover three types of purlin-rafter connections (purlins on edge over truss top chords, purlins flat over truss top chords, and purlins recessed between truss top chords) and relevant structural data. Results for three lateral-load-sharing analyses (purlin-rafter connections with roof systems, with frame, and as an independent component) will be presented.


About Dr. Gary Anderson

Gary received his BS degree in Agricultural Engineering in 1975 from South Dakota State University (SDSU), his MS in Agricultural Engineering and Structural Engineering (1985), and PhD (1987) in Agricultural Engineering from Iowa State University. He has taught AG structures (light-frame) and indoor air quality and instrumentation at SDSU for more than 30 years. Gary’s research has primarily focused on light-gage metal diaphragms on dimension lumber frames. He has been active in NFBA, serving as chair of the technical and research committee and on the editorial review committee as the technical editor for FBN T&R articles. Gary has worked with ASABE standards and engineering practices related to diaphragm design of buildings, diaphragm testing, and post embedment. He is currently a member of the American Society of Agricultural and Biological Engineers; American Society of Civil Engineers; American Society of Heating, Refrigerating, and Air-Conditioning Engineers; and NFBA.