Increased availability of cross-laminated timber (CLT) in North America combined with its successful use in projects worldwide has generated interest in its properties and performance within the U.S. design community. With the inclusion of CLT in the 2015 International Building Code and upcoming design standards, curiosity is evolving with a number of developers, architects and structural engineers looking to use CLT in upcoming projects. One application under frequent consideration is the use of CLT within horizontal floor and roof systems to create long-spanning structural decks. This paper is for engineers designing floor systems with CLT for the first time, who are unfamiliar with available design methodologies and current research results. Topics will include CLT system material properties and behaviors relevant to floor design, design approaches for strength and serviceability, and analysis methods. Particular attention will be given to long floor span applications typically governed by deflection and vibration, including a review of theoretical and experimentally based evaluation approaches.
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