CESMD

Information for Strong-Motion Station

San Juan Bautista - Hwy 101/156 Overpass

CGS - CSMIP Station 47315

Earthquakes recorded by this station

 

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

   

Latitude	36.8619 N
Longitude	121.58 W
Elevation (m)	122
Site Geology	Alluvium
Vs30 (m/sec)	371
Site Class	-

 

No. of Spans	6
Plan Shape	Straight with skew.
Total Length	28' (8.5m)
Width of Deck	28' (8.5m)
Construction Date	1958
Instrumentation	1977 & 2002. 12 accelerometers on the bridge. 3 accelerometers at a free-field site.

 

Superstructure Type	Welded steel girders with concrete diaphragm added during the retrofit supprted by rocker bearings. Seat abutments with catcher beams and integral wing walls.
Substructure Type	Concrete bents with rectangular columns. 2 columns per bent. Infill walls were added between the columns during the retrofit.
Foundation Type	Spread footings.
Remarks	The bridge was first instrumented by CSMIP in 1977. After the retrofit, the bridge was re-instrumented in 2002 under the interagency agreement between Caltrans and DOC.