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Design of Fully Restrained Moment Connections per AISC LRFD 3rd Edition (2001)

Jose-Miguel Albaine, M.S., P.E.

Many steel structures require connections that can develop moment because the beams are parts of a rigid frame. Beams that are part of the wind-bracing system of multi-story building must resist end moments resulting from both wind, seismic, and gravity loads. In the usual case, the moment capacity of the connection in such frames depends upon tension and /or shear developed in the fasteners or welds. This 4-hour course will review the basic concepts of the design of fully restrained moment connections (refer as FR moment connection in this course), based on the criteria specified in part 12 of the latest edition of the American Institute of Steel Construction (AISC) Manual of Steel Construction, Load and Resistance Factor Design, Third Edition, November, 2001, (herein referred as LRFD). The topics included are: general requirements for moment connections, including the effect of the moment connections on the flanges and web of the columns, prying forces in moment-resistant connections, welding considerations for FR moment connections, flange-plated FR moment connections, and directly welded flanges. Design of FR moment connections for HSS and steel pipe, extended end-plate moment connections, FR moment splices, and moment connections to column-web supports are not in the scope of this course. For FR moment connections that are part of a seismic-force-resisting system in which the seismic response factor R is greater than 3, refer to the Seismic Provisions, which are available from AISC at www.aisc.org. This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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