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Design of Fully Restrained Moment Connections

per AISC LRFD 3rd Edition (2001)

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

Course Outline

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

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

Learning Objective

This course is designed to assist professional engineers, architects, and designers who want to learn the latest specification regarding the design of FR moment connections using AISC LRFD 3rd Edition (2001), Part12.

After completion of course you should be able to:

Course Content

The course content is in a PDF file (223 KB) Design of Fully Restrained Moment Connections per AISC LRFD 3rd Edition (2001). You need to open or download this document to study this course.

Course Summary

This course has presented the basic principles related to the design of fully restraint moment connections using the latest edition of the AISC, Manual of Steel Construction, Load Resistance Factor Design, 3rd Edition.

The items discussed in this course included: design of T-stub bolted moment connection, flanged-plated (bolted and welded) FR moment connection, and directly welded flange FR moment connection. Other issues covered are: type of construction applicable to connections, column limit states in FR moment connection, brief overview of AISC LRFD load and resistance factors, and basic behavior of fully restrained moment connections.

The utilization of FR moment connections allows the structural engineer to design rigid frames as part of the main lateral resistive system whenever braced bents are not practical.


1. American Institute of Steel Construction, Manual of Steel Construction, Load Resistance Factor Design, 3rd Edition, November 2001

2. American Society of Civil Engineers, Minimum Design Loads for Buildings and Other Structures, ASCE 7-98

3. Charles G. Salmon and John E. Johnson, Design and Behavior of Steel Structures, 3rd Edition

4. Jack C. McCormac & James K. Nelson, Jr., Structural Steel Design LRFD Method, 3rd Edition

Related Links

For additional information related to this subject, please visit the following websites or web pages:

Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.

Take a Quiz

DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered professional engineer. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.