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Steel moment frames have been regarded as the ideal structural system for seismic design, since are thought to have reasonable strength and stiffness and excellent inelastic behavior. This provides a very open structure which offers many architectural advantages. They have extremely good structural behavior and engineers still hold the system in high regard, but there have been some surprises in past performance resulting in increasing complexity in their design. This webinar discusses the seismic behavior of steel moment frames and will review design provisions for achieving good performance of Ordinary, Intermediate or Special Steel Moment Resisting Frames. The design forces and basic design requirements are established in ASCE 7-16, and these are reviewed and discussed. To use ASCE 7 design forces capacity based design requirements are needed and they are included in AISC Strandards 341-16 and 358-16. The requirements of these standards are summarized and the design options for steel moment resisting frames are reviewed. The discussion includes some perspective of the historical development of the various options are included since this leads to insight of retrofit and rehabilitation requirements for existing systems.
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