Initial stabilization of two problem built-up plate girders at the Salesforce Transit Center in seismically active San Francisco, using a beam and tower shoring system to relieve loads on the girders, is scheduled to begin today, Sunday, Sept. 30, according to the Transbay Joint Powers Authority, which opened the nearly $2.3-billion hub in August.
TJPA closed the 1.2-million-sq-ft transit center, currently a bus depot with three levels above grade and a 5.4-acre rooftop public park, on Sept. 25, soon after a metal ceiling installer noticed a crack in the bottom flange of an 80-ft-long welded tapered girder spanning Fremont Street. The third-floor girder supports the park directly above and the second-floor bus level, via a hanger, directly below. Fremont Street, below the affected area, also is closed to traffic.