Buckling Restrained Braced Frames - SEAoT

BRB Axial Deformation ComparisonFor a ASCE 7 earthquake (2/3 of MCE)2.0 Δ bm ~ 10 Δ by (elastic methods, Ch. 16)Mean = 9-11 Δ by (Sabelli, Fahnestock)For a 2%/50 year eventNot addressed in codesMean = 17-19 Δ by (Sabelli, Fahnestock)• Ductilities underestimated but not forces• Solution: fabricate BRBs to Δ by larger thanpredicted by elastic methods