651 Gateway

South San Francisco, CA

ABOUT

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

 

PRODUCTS USED

SYSTEM

CATEGORY

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.

 

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