The Transbay Transit Center has been shut down amid concerns about a cracked steel beam

The $2.2 billion Transbay Transit Center opened Aug. 12 after years of delays and cost overruns. Six weeks later, the Salesforce Transit Center, as its now known, has been shut down after “crews today discovered a fissure in one of the steel beams in the ceiling,” according to the Transbay Joint Powers Authority, the public agency that operates the transportation hub.

“The safety of everyone who visits the Salesforce Transit Center is our obligation and highest priority,” said Mark Zabaneh,…