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An issue that turned out to be a red herring.
Based upon recent research by Professor Robert Dexter at the University of Minnesota, column flange through-thickness strength is much higher than the demand that could be generated by a beam flange (or other attachment), making through-thickness failure of column flanges highly unlikely. The article here (42K PDF) in the November 2000 issue of AISC's Modern Steel Construction magazine addresses this issue in detail.