Functional Recovery of Steel Special Moment Frames

Steel special moment frames (SMFs) designed per current codes will likely require major repair or be a total loss after design earthquake (DE) shaking. Functional recovery of SMFs can improved by designing to stricter drift limits, improving postyield stiffness, repairability. In this study, FEMA P-58/ATC-138 (beta) was used determine the most effective option for functional recovery. Eighteen were with different heights (4, 6, and 8 stories), risk categories (II IV), connections (with varying stiffness repairability) analyzed under response history analysis (RHA). Results from RHA in analyses quantify each design. The building designs showed that 6- 8-story Risk Category IV 1.8 2.2 times heavier than II designs, direct cost premium (versus II) 4%–14% costs. Response enhanced had up 47% lower residual drifts typical stiffness. repairability comparable While some proposals improve focus primarily on strength, study demonstrates relative value