Information for Strong-Motion Station
San Francisco - 2-story Commercial Bldg
CGS - CSMIP Station 58740
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 37.7935 N
Longitude 122.3967 W
Elevation (m) 3
Site Geology Thin fill over deep alluvium
Vs30 (m/sec) 245 (inferred)
Site Class D
Remarks/Notes Site information sources
No. of Stories above/below ground2/1
Plan ShapeSquare
Base Dimensions81' x 81'
Typical Floor DimensionsU-shaped 207' x 272'
Design Date1967
Instrumentation12 accelometers, 4 levels
Vertical Load Carrying System18.5" deep waffle slab with integral concrete beams supported by 12 concrete columns. Columns at the four corners were omitted.
Lateral Force Resisting SystemNonductile concrete frames formed by concrete columns and integral concrete beams, and a sheear wall on the west side of the first story. Braced frames with ADAS elements were added during retrofit.
Foundation Type12" square and 84' long precast concrete piles. Four or five piles under each column.
RemarksThe building suffered structural and non-structural damage the 1989 Loma Prieta earthquake and was strengthened in 1991.