Information for Strong-Motion Station
San Bernardino - 12-story Govt Bldg
CGS - CSMIP Station 23555
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 34.1042 N
Longitude 117.2885 W
Elevation (m) 311
Site Geology Deep alluvium
Vs30 (m/sec) 339 (measured)
Site Class D
Remarks/Notes Site information sources
No. of Stories above/below ground 12/1
Plan ShapeRectangular
Base Dimensions366 x 174 ft
Typical Floor Dimensions258 x 82 ft
Design Date2010
Instrumentation2014, 32 accelerometers on 7 levels and 4 relative displacement sensors in the building, plus 3 accelerometers at a reference free-field site.
Vertical Load Carrying SystemConcrete over steel deck supported by steel beams and columns, and friction pendulumn bearings at the base.
Lateral Force Resisting SystemSteel moment frames with RBS connections and 184 viscous dampers, isolated by 69 triple concave friction pendulum bearings (displacament capacity of 42 inches) at the base.
Foundation TypeConcrete mat foundation (4 feet thick at the tower and 2.25 feet at the podium) with raised pedestals at isolator locations.
RemarksThe building consists of a 3-story podium and a 12-story tower, and was designed according to the 2007 California Building Code. Funding for instrumentation was provided by the owner. CSMIP provided assistance in instrumentation.