But were Afraid to Ask PDF
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Everything You Wanted to Know About Diaphragms (But were Afraid to Ask) June 21, 2017 Copyright © 2017 Steel Joist Institute. All Rights Reserved. Presented by: Tom Sputo and Mike Antici Learning Objectives • Recent changes in design codes and construction practices have made diaphragm connection design more complicated and time consuming. This webinar identifies those changes, provides design guidance, reviews upcoming publications, and introduces new SDI design tools. • Recognizing appropriate AISI and SDI Standards and literature and understanding the limits of existing shear tables and evaluation reports. • Design procedures for uniquely shaped and sloped structures, as well as design procedures and shear capacities over CF framing. 2 What References are Available? https://cfsei.memberclicks.net/publications 3 How Are Previous References Used? SDI Diaphragm Interaction Calculator 4 How Are Previous References Used? 5 How are Shear Tables Developed? Flat roof, Symmetric, Corner sheets 6 Can It Be This Simple? S = SF ne x S = SM ni S = (A2 + B2)1/2 nc S = min ( S , S , S , S ) n ne ni nc nb 7 Should We Understand Diaphragm Limit States? 8 Do Floor Diaphragms Also Have Limit States? 𝑆↓𝑛 = 𝛽𝑃↓𝑛𝑓 /𝐿 +𝑘𝑏𝑑↓𝑐 √𝑓 ′↓𝑐 9 What’s the Most Critical Limit State? Deck, Fastener, or Support? 10
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