The underlying causes of the trouble at San Francisco’s 4.5-block-long Salesforce Transit Center are coming into focus. A combination of low fracture toughness deep inside thick steel plates, cracks present as a consequence of normal steel fabrication and stress levels from loads, which are a function of design, apparently caused brittle fractures in the bottom flanges of the center's twin built-up plate girders that span 80 ft across Fremont Street.
'Perfect Storm' Caused Fractures at San Francisco Transit Hub
January 8, 2019
Nadine M. Post - Engineering News-Record
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