Seismic behavior and design of concentrically braced steel frames

This paper describes the main characteristics of the inelastic seismic resp onse of concentrically braced steel frames. Current Canadian and U.S. provi sions for the seismic design of these structures are presented and discusse d, together with possible modifications that are currently being considered in view of recent research findings. Alternative bracing systems, which ha ve been proposed over the years to improve the seismic response of concentr ically braced steel frames, are also briefly described.