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AISC is currently investigating the causes of cracks that have occurred sporadically during fabrication of wide-flange shapes.
An advisory statement has been issued by AISC. Further information will be made available pending the results of current and ongoing research and testing. There is also a failure analysis article here (87K PDF) from the September 2000 issue of AISC's Modern Steel Construction magazine, as well as an excellent letter to the editor here (129K PDF) in the November 2000 issue.