International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
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Improved Seismic Design of Steel Frame Connections

Roeder, Charles W.;Lehman, Dawn E.;Yoo, Jung-Han

  • Published : 20050600
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Abstract

Reliable seismic performance requires structural systems capable of sustaining multiple inelastic displacement cycles at large drifts. Response of steel framing systems depends to a large part on the inelastic deformation capacity of the framing elements. Recent research into the seismic performance of moment resisting frames has shown that improved response, including increased ductility, is possible if limited yielding is also permitted in the connection in addition to the beams, and the resistances of these yield mechanisms are balanced. Adverse effects of premature failure are controlled by balancing the failure mode resistances with these yield mechanisms. However, current seismic design provisions do not permit these practices in braced frame gusset plate connections. In this paper, the design methodology to balance the yield mechanisms and failure modes is presented with the objective of improving the seismic response of steel framing systems. Initially, the strategy is demonstrated for special steel moment resisting frames with welded-flange-welded-web connections. Next, the design procedure is theoretically applied to special concentrically braced frames. Past experimental results are used to develop improved design models for braced frame gusset plate connections, and to provide preliminary estimates of the required design parameters. Additional research that is required to finalize the design procedure for braced frame systems is discussed.

Keywords

References

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