Information for Strong-Motion Station
Grapevine - I5/Lebec Rd Bridge
CGS - CSMIP Station 24775
Earthquakes recorded by this station
(Station Photograph - click to enlarge)(Sensor Layout - click to see PDF File)
Latitude 34.8663 N
Longitude 118.8836 W
Elevation (m) 999
Site Geology Alluvium
Vs30 (m/sec) 437 (measured)
Site Class C
Remarks/Notes Site information sources
No. of Spans4
Plan ShapeCurved with skew
Total Length488.6' (148.9m). Bridge spans range from 71' (21.6m) to 158' (48.2m).
Width of Deck40' (12.2m)
Construction Date1964
Instrumentation1998. 13 accelerometers on the bridge. 3 accelerometers at a free-field site.
Superstructure TypeSimply supported welded composite steel girders with lateral stiffening braces (retrofit). L-type abutments.
Substructure TypeRectangular concrete columns. 3 or 4 columns per bent with shear walls between the columns (retrofit).
Foundation TypeSpread footings support the bents. Concrete piles support the abutments.
RemarksThis bridge was instrumented under the interagency agreement between Caltrans and DOC. The shear walls between the concrete columns and the lateral braces between the steel girders were added during the 1997 retrofit.