CESMD |
Information for Strong-Motion Station |
San Rafael - 3-story Office Bldg |
CGS - CSMIP Station 68341 |
Earthquakes recorded by this station |
Latitude | 38.0197 N |
Longitude | 122.5413 W |
Elevation (m) | 2 |
Site Geology | Thin fill over rock (sandstone/siltstone) |
Vs30 (m/sec) | - - |
Site Class | C |
Remarks/Notes | Site information sources |
No. of Stories above/below ground | 3/0 |
Plan Shape | Nearly Rectangular (L-shaped) |
Base Dimensions | 449 x 198 ft |
Typical Floor Dimensions | 449 x 198 ft |
Design Date | 1975, 2012 (retrofit) |
Instrumentation | 1978: 16 accelerometers on 4 levels in the building. 2013: re-installed after retrofit. |
Vertical Load Carrying System | RC waffle slab supported by steel beams (encased in slab) and columns at each level. |
Lateral Force Resisting System | Reinforced concrete shear walls and distributed steel moment frames. Retrofit (2013): Addition of new concrete shear walls and thickening of some of the existing concrete shear walls. |
Foundation Type | Concrete caissons tied together with grade beams. |
Remarks | The 1975 design was based on the 1970 UBC. The 2013 retrofit was designed in accordance with the 2010 CBC. There is a 3-story building adjacent with a 4" seismic joint. |