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Additional info for ANSI AISC 358-05 Prequalified Connections for Special and Intermediate Steel Moment Frames for Seism
The addition of the fillet weld beneath the backing makes the inherent notch at the interface an internal notch, rather than an external notch, reducing the notch effect. When backing is removed, the reinforcing fillet weld reduces the stress concentration at the right-angle intersection of the continuity plate and the column flange. 2 Steel Backing at Beam Bottom Flange The removal of backing, whether fusible or non-fusible, followed by backgouging to sound weld metal, is performed so that potential root defects within the welded joint are detected and eliminated, and the stress concentration at the weld root is eliminated.
2–53 ally distributed to some extent throughout the connection assembly. The plastic hinge locations specified herein are based on observed behavior during connection assembly tests and indicate the locations of most anticipated inelastic deformation in connection assemblies conforming to the particular prequalified type. 3 Probable Maximum Moment at Plastic Hinge The probable plastic moment at the plastic hinge is intended to be a conservative estimate of the maximum moment likely to be developed by the connection under cyclic inelastic response.
3 Steel Backing at Beam Top Flange Because of differences in the stress and strain conditions at the top and bottom flange connections, the stress/strain concentration and notch effect created by Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications AMERICAN INSTITUTE OF STEEL CONSTRUCTION, INC. 2–56 COMMENTARY the backing/column interface at the top flange is at a lower level, compared to that at the bottom flange. Therefore, backing removal is not required.
ANSI AISC 358-05 Prequalified Connections for Special and Intermediate Steel Moment Frames for Seism