Abstract
Abstract In the analysis of moment-resisting steel frames the joints are ordinarily assumed to be rigid. During severe earthquakes, however, such points, including beam-to-column connections, can undergo severe inelastic deformations, thereby substantially affecting frame flexibility. In this paper, some Berkeley cyclic experiments on large specimens are critically reviewed and the contributions of connections, panel zones, and column web stiffeners (continuity plates) to joint flexibility in the post-elastic range of behavior are evaluated. The paper concludes with a discussion of the mathematical modeling of joint flexibility in the inelastic range and suggestions for further analytical studies as well as possible improvements in commonly used joint details.
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