The cracks discovered beneath the rooftop park were classic brittle fractures. The tapered 4-inch-thick steel beams—2.5 feet wide and 60 feet long, with a horizontal flange on the bottom—undergirded the 5.4-acre park on the building’s fourth level, and buttressed the roof of the bus deck on the second level. By themselves, the cracks formed a point of weakness with potentially hazardous consequences. But they also suggested the possibility of a larger crisis. — Popular Mechanics

Eight months after the discovery of cracked steel girders forced its closure, the Transbay transit center is safe to reopen, an independent panel of engineers and experts has concluded. The reopening is set for 6 a.m. July 1. — San Francisco Chronicle

The San Francisco County Transportation Authority voted unanimously Tuesday to freeze $9.7 million in sales tax funding for the next phase of the Transbay Transit Center, as members called for an evaluation of the beleaguered project and the agency that runs it.

The news came as Transbay officials again pushed back the date to complete testing of steel from two cracked beams that led to shutting down the building in September. — San Francisco Chronicle

San Francisco’s new Transbay Transit Center will remain closed at least through the end of next week, officials said Wednesday, after yet another cracked beam was discovered during an overnight safety inspection.

The $2.2 billion hub for buses and eventually trains, which opened just last month as the flashy centerpiece of city infrastructure, was closed abruptly Tuesday afternoon after a fissure was spotted in a beam that helps hold up the sprawling complex. — San Francisco Chronicle