“An underlying weakness in the steel itself, stresses during fabrication and thermal cutting, and the strain from loads during service.” “The two brittle fractures were likely caused by a ‘perfect storm’ of three factors,” says Mike Engelhardt, chair of the review committee and a structural engineering professor at University of Texas-Austin. Citing an “abundance of caution,” officials of the Transbay Joint Powers Authority closed the transit center and park, and empaneled a peer review committee of five nationally recognized experts in steel structure and fracture mechanics to examine the cause of the cracks and oversee the plan for the repair. ![]() ![]() On September 25, 2018, workers discovered two cracked steel beams supporting the bus deck of the $2.2 billion project, which, along with the neighboring Salesforce Tower, dominates the skyline and alters the economic and cultural landscape of one the world’s great cities. ![]() Nine months after its glorious debut, and eight months after its temporary, ignominious closing, Salesforce Transit Center and Park in San Francisco re-opens to the public today, Monday, July 1.
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