CESMD |
Information for Strong-Motion Station |
San Francisco; Transamerica Tower |
NSMP Station 1239 |
Earthquakes recorded by this station |
Ambient Records for NP1239 |
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 | -- |