Abstract
Seismic design of steel building structures has undergone significant changes since the Northridge, California earthquake in 1994. Steel structures, thought to be ductile for earthquake resistance, experienced brittle fracture in welded moment connections. The latest AISC Seismic Provisions reflect the significant research findings that resulted from the Northridge earthquake. This chapter first starts with a description of the seismic design philosophy, the concept of system parameters (R, C d, and Ωo) and capacity design. Background information for the seismic requirements in the AISC Seismic Provisions of Moment Frames, Concentrically Braced Frames, and Eccentrically Braced Frames are then presented. Design examples are provided for each of the three structural systems.
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