222 Second Street

One of the first structures to be built as part of the Transbay Development, 222 Second Street is a 370 foot skyscraper in the South of Market District of San Francisco, California consisting of 26 floors of commercial office space. Social networking company LinkedIn announced that they are leasing the whole building when it opens in 2015, to accommodate 2,500 of its employees currently based in Mountain View, Silicon Valley, California.

DBM Vircon’s Scope of Work:

Developed by Tishman Speyer and designed by Thomas Phifer, the structure is a skyscraper that will provide 450,000 square feet of office space and 2,200 square feet of retail space at ground floor at the southern corner of Second and Howard. DBM Vircon, working for The Herrick Corporation, modeled and detailed some 5,500 tons of structural steelwork incorporating buckling restrained bracing connections to the full height of the structure. The necessity for seismic beam and column connection design due to the structures position in San Francisco increased the complexity of detailing works for the in-house team.

222 Second Street Project Highlights & Challenges:

• The design is based on simple beam floor plans, taking stability from a central steel core braced using Buckling Restrained Bracings (BRBs) that are designed to prevent buckling under axial compression, a system specifically designed for huge seismic loads incurred during earthquake conditions.
• The project faced major changes during the detailing schedule with little revision to drawing submittal dates.
• Construction has now commenced and is complete to level 7 and erection is progressing well and on schedule.