NEHRP Clearinghouse

Structural Steel Bracing Systems: Behavior Under Cyclic Loading.
Popov, E. P.; Takanashi, K.; Roeder, C. W.
National Science Foundation, Washington, D.C., June 1976, 82 p.
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A survey is made of existing literature on the performance of steel braced frame structures under cyclic excitations. Particular emphasis is placed on inelastic behavior under extreme credible excitations which may occur during a severe earthquake. The experimental and analytical studies of the behavior of an individual brace are described. The effect of the individual braces on the behavior of the entire structural system is then brought out. The behavior of a concentrically braced frame is discussed with respect to dynamic response to given excitations as well as its quasi-static hysteretic behavior under cyclic load. The advantages and limitations of the two possible approaches to design and correlations between them are indicated. The overall problem is very complex and has not been completely resolved, but a number of plausible design concepts have been advanced. Several design concepts, such as the eccentrically connected braced frame, show that braced frames can perform well under extreme excitations. Finally, the limitations of current knowledge are summarized and recommendations for further research are made.
Structural engineering; Steel construction; Earthquake resistant structures; Framed structures; Structual steels; Bracing; Structural design; Earthquake engineering; Cyclic loads; Structural analysis