Major design impact of 1997 LRFD steel seismic code revision in USA

摘要

Based on the study of response of structures in 1994 Northridge earthquake, and the ongoing researches, significant changes were made to the 1997 LRFD seismic provisions.~1 In this paper, the major changes of the 1997 LRFD steel seismic code provisions will be discussed. The advanced analysis will be introduced to seismic design and will be used to address the major design impacts due to the 1997 LRFD seismic provision changes. Overall, due to the influence of expected yield stress, drift is likely to control the design, even for the concentrically braced frames.