AISC 812 : 1999 ERRATA 2003

Preface
1 Introduction
  1.1 Background
  1.2 Factors Contributing to Connection Failures
  1.3 Repair and Modification
  1.4 Objective of Design Guide
2 Achieving Improved Seismic Performance
  2.1 Reduced Beam Section
  2.2 Welded Haunch
  2.3 Bolted Bracket
3 Experimental Results
  3.1 Related Research
      3.1.1 Reduced Beam Section
      3.1.2 Welded Haunch
      3.1.3 Bolted Bracket
  3.2 NIST/AISC Experimental Program
      3.2.1 Reduced Beam Section
      3.2.2 Welded Haunch
      3.2.3 Bolted Bracket
4 Design Basis for Connection Modification
  4.1 Material Strength
  4.2 Critical Plastic Section
  4.3 Design Forces
      4.3.1 Plastic Moment
      4.3.2 Beam Shear
      4.3.3 Column-Beam Moment Ratio
  4.4 Connection Modification Performance Objective
5 Design of Reduced Beam Section Modification
  5.1 Recommended Design Provisions
      5.1.1 Minimum Recommended RBS Modifications
      5.1.2 Size and Shape of RBS Cut
      5.1.3 Flange Weld Modifications
      5.1.4 Techniques to Further Enhance Connection
            Performance
  5.2 Additional Design Considerations
  5.3 Design Example
6 Design of Welded Haunch Modification
  6.1 Recommended Design Procedure
      6.1.1 Structural Behavior and Design Considerations
      6.1.2 Simplified Haunch Connection Model And
            Determination of Haunch Flange Force
      6.1.3 Haunch Web Shear
      6.1.4 Design Procedure
  6.2 Recommended Detailing Provisions
      6.2.1 Design Weld
      6.2.2 Design Stiffener
      6.2.3 Continuity Plates
  6.3 Design Example
7 Design of Bolted Bracket Modification
  7.1 Minimum Recommended Bracket Design Provisions
      7.1.1 Proportioning of Bolted Haunch Bracket
      7.1.2 Beam Ultimate Forces
      7.1.3 Haunch Bracket Forces at Beam Interface
      7.1.4 Haunch Bracket Bolts
      7.1.5 Haunch Bracket Stiffener Check
      7.1.6 Angle Bracket Design
  7.2 Design Example
8 Considerations for Practical Implementation
  8.1 Disruption or Relocation of Building Tenants
  8.2 Removal and Restoration of Collateral Building
      Finishes
  8.3 Health and Safety of Workers and Tenants
  8.4 Other Issues
9 References
Symbols
Abbreviations
APPENDIX A