CESMD

Information for Strong-Motion Station

San Francisco; Transamerica Tower

NSMP Station 1239

Earthquakes recorded by this station

Ambient Records for NP1239

 

(Station Photograph - click to enlarge)	(Sensor Layout - click to see PDF File)

   

Latitude	37.7952 N
Longitude	122.4028 W
Elevation (m)	5
Site Geology
Vs30 (m/sec)
Site Class

 

No. of Stories above/below ground	60/4 (the 48th story is the highest occupied floor
Plan Shape	regular
Base Dimensions	174 x 174 ft
Typical Floor Dimensions	The floor dimensions reduce linearly with a slope of 10% from ground level to the roof
Design Date	1972
Instrumentation	1985, 24 accelerometers on 8 levels in the building.

 

Vertical Load Carrying System	2.5" of concrete cover over 3" concrete filled corrugated steel decking spot welded to the floor beams supported by steel columns.
Lateral Force Resisting System	Tubular space-truss systsm around the perimeter between the second and fifth floors and steel moment-resisting frame above the fifth floor. The below ground levels consist of rigid shear-wall box.
Foundation Type	9-ft-thick mat foundation
Remarks	--