CESMD |
Information for Strong-Motion Station |
Grapevine - I5/Lebec Rd Bridge |
CGS - CSMIP Station 24775 |
Earthquakes recorded by this station |
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 Spans | 4 |
Plan Shape | Curved with skew |
Total Length | 488.6' (148.9m). Bridge spans range from 71' (21.6m) to 158' (48.2m). |
Width of Deck | 40' (12.2m) |
Construction Date | 1964 |
Instrumentation | 1998. 13 accelerometers on the bridge. 3 accelerometers at a free-field site. |
Superstructure Type | Simply supported welded composite steel girders with lateral stiffening braces (retrofit). L-type abutments. |
Substructure Type | Rectangular concrete columns. 3 or 4 columns per bent with shear walls between the columns (retrofit). |
Foundation Type | Spread footings support the bents. Concrete piles support the abutments. |
Remarks | This 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. |