The New SDI Diaphragm Design Manual Aug, 2007 By Dong Li, P.E. In Articles, Design Updates This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Dong Li, P.E.Dong Li, P.E., is an engineer of Cold-Formed Products for Canam Steel Corporation at Point of Rocks, Maryland. She can be reached at dong.li@canam.ws. Prev Stephen P. Timoshenko Next Structural Engineering Codes and Standards in the United States