AISC 812:1999
AISC 812:1999 Design Guide 12: Modification Of Existing Steel Welded Moment Frame Connections For Seismic Resistance Covers the rehabilitation of existing welded steel moment frame buildings to improve their seismic resistance.
Table of Contents
Preface1Introduction
1.1Background
1.2FactorsContributingtoConnectionFailures
1.3RepairandModification
1.4ObjectiveofDesignGuide
2AchievingImprovedSeismicPerformance
2.1ReducedBeamSection
2.2WeldedHaunch
2.3BoltedBracket
3ExperimentalResults
3.1RelatedResearch
3.1.1ReducedBeamSection
3.1.2WeldedHaunch
3.1.3BoltedBracket
3.2NIST/AISCExperimentalProgram
3.2.1ReducedBeamSection
3.2.2WeldedHaunch
3.2.3BoltedBracket
4DesignBasisforConnectionModification
4.1MaterialStrength
4.2CriticalPlasticSection
4.3DesignForces
4.3.1PlasticMoment
4.3.2BeamShear
4.3.3Column-BeamMomentRatio
4.4ConnectionModificationPerformanceObjective
5DesignofReducedBeamSectionModification
5.1RecommendedDesignProvisions
5.1.1MinimumRecommendedRBSModifications
5.1.2SizeandShapeofRBSCut
5.1.3FlangeWeldModifications
5.1.4TechniquestoFurtherEnhanceConnection
Performance
5.2AdditionalDesignConsiderations
5.3DesignExample
6DesignofWeldedHaunchModification
6.1RecommendedDesignProcedure
6.1.1StructuralBehaviorandDesignConsiderations
6.1.2SimplifiedHaunchConnectionModelAnd
DeterminationofHaunchFlangeForce
6.1.3HaunchWebShear
6.1.4DesignProcedure
6.2RecommendedDetailingProvisions
6.2.1DesignWeld
6.2.2DesignStiffener
6.2.3ContinuityPlates
6.3DesignExample
7DesignofBoltedBracketModification
7.1MinimumRecommendedBracketDesignProvisions
7.1.1ProportioningofBoltedHaunchBracket
7.1.2BeamUltimateForces
7.1.3HaunchBracketForcesatBeamInterface
7.1.4HaunchBracketBolts
7.1.5HaunchBracketStiffenerCheck
7.1.6AngleBracketDesign
7.2DesignExample
8ConsiderationsforPracticalImplementation
8.1DisruptionorRelocationofBuildingTenants
8.2RemovalandRestorationofCollateralBuilding
Finishes
8.3HealthandSafetyofWorkersandTenants
8.4OtherIssues
9References
Symbols
Abbreviations
APPENDIXA