The first piece of structural steel visible at street level at the new Transbay Transit Center was lifted into place during a Nov. 7 ceremony in downtown San Francisco. Thornton Tomasetti is providing structural design services to Pelli Clarke Pelli Architects and LEED consulting support services for the project, which is replacing the old Transbay Transit Center built in 1939. The new facility will connect eight Bay Area counties and the state of California through 11 transportation systems, including a future high-speed rail line to run between San Francisco and Los Angeles/Anaheim. The five-story center will contain office and retail space, a green-roof park, passenger circulation in the lower concourse and trains at the bottom level. It will accommodate approximately 100,000 travelers daily when it opens in late 2017. The building’s concrete and steel structure is designed to survive a maximum-strength earthquake without major structural damage or significant loss of function. In addition to this steel erection milestone, the project’s 5-foot-thick mat foundation has also been completed, which required 60,000 cubic yards of concrete, and work has begun on the new bus ramp that will connect the facility’s elevated bus deck to the Bay Bridge. The project’s sustainable features include a massive 5.4-acre rooftop park, natural daylighting and multiple water conservation systems. LEED Gold certification is planned for the facility.
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