Steel Tips from the Structural Steel Educational Council

Steel TIPS

04.1997 > Seismic Design of Steel Column-Tree Moment Resisting Framese

By Abolhassan Astaneh-Asl, Ph.D., P.E.

Seismic Design of Steel Column-Tree Moment Resisting Framese

This report presents information and tips on seismic behavior and design of steel column-tree moment-resisting frames used in building structures. In column-tree moment-resisting frames, short stubs of girders are welded to the column in the shop and then the middle portion of the girder spans are bolted to the column trees in the field. Thus, the system is a field bolted-shop welded structural system. The emphasis of the report is on the seismic behavior and design of special ductile steel column-tree moment-resisting frames. A summary of relevant research and applicable code provisions is provided followed by design procedures that can be used to design steel column-tree moment-resisting frames. The appendix to the report provides a numerical example on seismic design of a typical connection of a steel column-tree moment-resisting frame. The example utilizes the concepts and recommendations presented in the report.

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