Unbraced Frames – Sway Stability

Having looked at braced frames in the November/December 2002 issue of New Steel Construction, this article considers unbraced frames, often known as continuous frames. In fact, the process is exactly the same as for unbraced frames, in that λcr, the measure of sway sensitivity, is calculated by applying the Notional Horizontal Forces (NHF) to the frame. The more interesting issues are the methods of dealing with sway-sensitive frames and the identification of the sway effects. David Brown reports.

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