| The aim of this study is to provide information regarding the reliability of the Seismic Performance Factors (SPFs) R, Cd, and Omega 0 for use in the design of steel Special Moment Resisting Frames (SMFs). This is done by utilizing the FEMA P695 Methodology, which is used to determine the margin of safety for structural systems subjected to earthquakes. Sample SMFs are designed using assumed SPF values. Models are developed for each SMF design that incorporate material properties for strength, stiffness, and cyclic load deterioration. The models are then subjected to earthquake ground motions to determine the collapse performance of each SMF. The results are analyzed per the guidelines of the FEMA P695 Methodology to assess the collapse performance of the structures and the reliability of the SPFs.;This study found the use of SPFs R=8 and Cd=5.5 questionable for steel SMFs, in that they provide a very small, if any, margin of safety when used in conjunction with the Response Spectrum Analysis procedure specified in the ASCE 7-05. It is recommended that further studies be done to broaden the sample base for use in SMF assessment. |
