Information for Strong-Motion Station
San Francisco - 7-story Govt Office Bldg
CGS - CSMIP Station 58571
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7725 N
Longitude 122.3888 W
Elevation (m) 2
Site Geology Deep Alluvium
Vs30 (m/sec) - -
Site Class F
Remarks/Notes Site information sources
No. of Stories above/below ground7/1
Plan ShapeRectangular
Base Dimensions176 x 266 ft
Typical Floor Dimensions75 x 205 ft
Design Date2011
Instrumentation2014, 15 accelerometers on 4 levels in the building.
Vertical Load Carrying SystemConcrete fill over steel deck at each level supported by steel beams and columns
Lateral Force Resisting SystemBuckling restrained braced steel frames in both directions located at the perimeter and interior at each level. Also, perimeter concrete shear walls at the basement level. Ramps for parking are between basement and Level P4.
Foundation Type2' thick mat slab with concrete pile caps and steel H piles (about 214 feet long) at column locations. Pile caps are tied with concrete grade beams. Concrete encased steel upstand beams connect columns of braced frames and are tied to the grade beams.
RemarksStructural design is based on the 2010 San Francisco Building Code (including 2010 CBC). The building is separated by seismic joints from adjacent structures. Top three stories are offices while the low four stories plus the basement are parking.