Information for Strong-Motion Station
San Francisco - 6-story Govt Office Bldg
CGS - CSMIP Station 58768
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7713 N
Longitude 122.4199 W
Elevation (m) 10
Site Geology Alluvium
Vs30 (m/sec) 286 (inferred)
Site Class D
Remarks/Notes Site information sources
No. of Stories above/below ground6/1
Plan ShapeTrapezoidal
Base Dimensions150' x 175'
Typical Floor DimensionsTrapezoidal 98' x 145'
Design Date1987
Instrumentation1998. 11 accelerometers, on 3 levels in the building.
Vertical Load Carrying System2.5" normal weight concrete over 3" steel deck supported by steel beams and columns for the 2nd to 6th floor and roof. The basement slab is 10" thick flat slab supported on concrete columns with 5.5" thick 3.75' square drop caps.
Lateral Force Resisting SystemDual system consisting of Chevron type braces frames and moment frames located along the perimeter. 9" thick concrete walls doweled with existing 12" concrete walls in the basement.
Foundation TypeColumns are supported on isolated spread footings 1.5' to 3.5' thick and concrete walls are supported on continuous spread footings.
RemarksThis building was designed as per the 1984 San Francisco City Building Code.