Information for Strong-Motion Station
San Francisco - 13-story Gov Office Bldg
CGS - CSMIP Station 58509
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7808 N
Longitude 122.4192 W
Elevation (m) 20
Site Geology Alluvium over rock (Franciscan)
Vs30 (m/sec) 286 (inferred)
Site Class D
Remarks/Notes Site information sources
No. of Stories above/below ground 13/1
Plan ShapeRectangular
Base Dimensions180 x 116 ft
Typical Floor Dimensions175 x 105 ft
Design Date2010
Instrumentation2012, 24 accelerometers on 8 levels.
Vertical Load Carrying System6 to 8-inch post-tensioned concrete slab and beams supported by concrete walls and columns. Concrete slabs on metal decks supproted by steel beams and columns at the penthouse.
Lateral Force Resisting SystemTwo concrete core shear walls. The core walls utilize a combination of vertically post-tensioned tendons and mild steel to resist the lateral loads. The east core is linked to an ourigger concrete column. At the penthouse, concentrically braced steel frames resist the lateral loads.
Foundation Type10-foot thick concrete mat foundation and 65-foot long micropiles support concrete core walls. 4-foot thick concrete mat foundation supports the gravity columns.
RemarksStructural design was based on the 2007 San Francisco Building Code. A full height tower (steel) on the north side of the building houses wind turbines above the 6th floor level. Wind turbines are also located on the rooftop.