Superstructure Type | Original: Lightweight RC deck on two steel girders for Spans 1-40. Spans 41-70 are RC slab spans on concrete columns. Abutment 1 is a seat type and Abutment 71 is a diaphragm type. Retrofit: (a) replace existing bearings with friction pendulum isolator bearsings at Abutment 1, Piers 2 through 41, |
Substructure Type | Original: 2-column RC piers from Piers 2 to 41. 4-column RC piers at slab spans. Retrofit: (a) post-tension pier cap at P2 to P39, (b) install steel braces between columns at Piers 12 to 31, (c) install steel jackets on RC columns at slab spans, and (d) remove existing concrete curtain walls at sl |
Foundation Type | Concrete piles; no retrofit on foundations. |
Remarks | The bridge was instrumented under the interagency agreement between Caltrans and DOC/CGS in 1998 with 18 sensors. The bridge was re-instrumented with 73 sensors during retrofit. A geotechnical array with 6 depths between Piers 35 and 36 was also installed during retrofit. |