Eccentrically Braced Steel Frames for Earthquakes

by Charles W. Roeder, (A.M.ASCE), Grad. Student; Dept. of Civ. Engrg., Univ. of California, Berkeley, Calif.,
Egor P. Popov, (F.ASCE), Prof.; Dept. of Civ. Engrg., Univ. of California, Berkeley, Calif.,

Serial Information: Journal of the Structural Division, 1978, Vol. 104, Issue 3, Pg. 391-412

Document Type: Journal Paper


A unique, practical structural steel system that possesses many advantages in the seismic design of structures is described. The system employs diagonal bracing with large eccentricity between the brace-beam connection and the beam column joint. The eccentricity provides a ductile fuse that yields in shear and prevents brace buckling. Static and dynamic analyses indicates that this system can perform well during earthquakes, because it combines the stiffness of a braced frame with the excellent energy dissipation of a moment-resisting frame. One-third-scale experiments showed that the system behaves as predicted in the analyses. It dissipates large amounts of energy while maintaining a very stiff structure, and it offers many potential applications in the seismic design of structures.

Subject Headings: Steel frames | Steel structures | Seismic design | Bracing | Earthquakes | Seismic tests | Beam columns | Dynamic structural analysis

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