Location South San Francisco, CA
Size 300,000 sqft
Stories 17
Building Type Commercial
Number of Dampers 127
Structural Engineer IMEG & Maffei
General Contractor Truebeck Construction
Owner Boston Properties
Retrofit
Upgrading this structure from standard office space to Class A lab space provided a unique opportunity to include a voluntary seismic upgrade along with MEP and Architectural improvements. The structure, built in the late 1980s, uses both Eccentric Braced Frames and perimeter Pre-Northridge Moment Frames as the lateral systems, both of which contained deficiencies common to those construction eras. Dampers reduced the story drifts significantly, addressing a soft story mechanism and reducing beam-column rotations to eliminate any connection or foundation upgrades. Dampers were placed in a staggered pattern up the height of the building to reduce the accumulation of force in any given location.