Buckling Restrained Braced Frames - SEAoT

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Design SummaryLoad CombinationGravity Seismic1.2D + 1.6L 1.2D + 0.5L + EFrameDesign for 100% ofloadDesign for maximumbrace forces, plus 100% ofgravityBracesCheck to makesure live load doesnot cause (cyclic)yieldingDesign for seismic forcefrom analysis; do notinclude gravity
Brace StiffnessK br = P/ΔΔL y~ PL y /A y E= 0.5-0.8 L(depending onbrace type andconfiguration)K br = 1.2 - 2.0 A y E /LFlexibilityL yEA scL L yEA nonyielding
Page 1 and 2: Buckling-Restrained Braced Framesby
Page 3 and 4: Code Intent
Page 5 and 6: To survive a strong earthquakewitho
Page 7 and 8: How BRBs work
Page 9 and 10: BRB Definitions Explained:Conventio
Page 11 and 12: Brief History of BRBFsin US Codes
Page 13 and 14: Background (recent past/present)SEA
Page 15 and 16: Sample BRBF Construction
Page 18 and 19: Sample Construction
Page 21: GEM High-Expectation Entrepreneursh
Page 24 and 25: BRB Tests Short Summary• About 50
Page 26 and 27: ASCE 7 2005 (with Supplement 1)R Va
Page 28 and 29: ASCE 7 2005 (with Supplement 1)C d
Page 30 and 31: ASCE 7 2005 (with Supplement 1)Coef
Page 32 and 33: Design Methodology
Page 34 and 35: BRBF Design Methodology• BRB is e
Page 38 and 39: BRB ModelingK br = 1.3 A sc E /L ?
Page 40 and 41: Steel Core Material• Specificatio
Page 42 and 43: BRB Axial Deformation CheckCompute
Page 44 and 45: BRB Axial Deformation ComparisonFor
Page 46 and 47: BRB Adjusted StrengthCompression:
Page 48 and 49: BRB Uniaxial Test ResultsHysteresis
Page 50 and 51: BRB Adjusted StrengthCase at invert
Page 52 and 53: Frame Design: Model BRB forces Usin
Page 54 and 55: Use of Proprietary BRBsEngineer Spe
Page 56 and 57: Alternate Specification of BRB Size
Page 58 and 59: Code Issues• BRB is a better brac
Page 60 and 61: Sample Connections
Page 62 and 63: Gusset Plate Design Issues•Adjust
Page 64 and 65: Potential Connection IssuesCourtesy
Page 66 and 67: Summary
Page 68 and 69: Overall SummaryBRBs harness steel d

Buckling Restrained Braced Frames - SEAoT

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