Engineers interested in further information on steel diaphragms have a number of resources available to them. All of the SDII partners maintain websites with useful information, here we have directly linked to the most useful starting place on our partner websites: AISC, AISI, SDI, SJI, and MBMA. Manufacturers provide significant additional information; examples include, but are not limited to CanAm and Verco. The NEHRP Technical Brief Series is also a good place to start as described in this post.