R = 100? Toward codification of controlled rocking steel braced frames

In the move toward performance-based seismic design, controlled rocking steel braced frames show great potential because of their ability to avoid structural damage during large earthquakes. This paper describes performance objectives for these systems that are consistent with current codes, and it examines what hysteretic properties are needed to achieve these objectives by discussing the behavior of single-degree-of-freedom (SDOF) systems. …