The steel fabricator for the third-floor tapered, built-up plate girders at the troubled Salesforce Transit Center in San Francisco is calling for a girder-hanger connection design review as part of the probe into the causes of brittle fractures in bottom flanges of twin 80-ft-long members that bridge Fremont Street. The facility was closed in late September.
At the midspan, each 8-ft-deep girder web is thickened by a vertical hanger plate to support the second-floor bus deck below. The hanger plate is welded to the web and slots through the girder’s bottom flange.
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