Civil Engineering Association

DISPOSABLE KNEE BRACING: IMPROVEMENT IN SEISMIC DESIGN OF STEEL FRAMES

A new and practical technique of lateral bracing for single- and multistory
steel frame construction is presented and discussed. Disposable Knee i
Bracing (DKB) technique, as it is called in this paper, is made up of two struc- :
tural elements, the knee element and the diagonal brace element. The knee (
element is a fuse-like element that dissipates energy by the formation of plastic
flexural hinges at its ends and midspan when the building is subjected to severe
lateral loads. The diagonal brace element, on the other hand, provides the required
level of lateral stiffness and remains in the elastic range at all time. The
knee element is a disposable beam element that can be replaced once its energy
dissipation capacity is utilized. Standard limit analysis of low- and high-rise
steel frames are presented to demonstrate the advantages of the DKB against
traditional bracing and eccentric bracing.

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