As with all of the bay bridges that serve as life lines to the San Francisco peninsula, the 32-year-old San Mateo Bridge needs strengthening to withstand a maximum credible earthquake with minimal risk of collapse. Strengthening the high-rise portion of the San Mateo Bridge required retrofitting the superstructure, substructure, and pier foundations within tight spaces. The design called for upgrading the steel box girder hinges, drilling new piles, and encasing piers in either concrete collars or steel jackets. Despite the many challenges encountered in seismically retrofitting the high-rise section of the bridge, the project has been carried out with minimum delay. Presently, the high spans carry six vehicular lanes and the trestle four. After the retrofit is completed, the bridge should withstand a 7.5 magnitude quake on the Hayward Fault line and an 8.3 event on the line of the San Andreas Fault.


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  • Accession Number: 00789042
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 27 2000 12:00AM