| Approved changes to AISI S100-07,
the North American Specification for the Design of Cold-Formed Steel Structural
Members, would conservatively ignore the rotational restraint of sheathing,
unless the beneficial effect is quantified by testing or rational engineering
analysis. The approved Commentary includes a simplified and conservative
engineering formula for wood sheathing, but does not address cases where
gypsum board would be the desired sheathing material. This project was initiated
to minimize the adverse impact of these new provisions for distortional
buckling.
The objective of this project was to perform tests in
accordance with AISI TS-1-02 to experimentally determine the rotational
restraint that sheathing provides to joists. It is anticipated that the
results of this study will be incorporated in future standards developed
by the AISI Committee on Framing Standards and design aids developed by
the Cold-Formed
Steel Engineers Institute.
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