PERFORMANCE OF BRIDGES DURING SAN FERNANDO EARTHQUAKE

DURING THE 1971 SAN FERNANDO EARTHQUAKE SEVEN BRIDGES WERE EITHER DESTROYED OR SO BADLY DAMAGED THAT THEY HAD TO BE DEMOLISHED, WHILE AN ADDITIONAL 60 SUFFERED MODERATE TO EXTENSIVE DAMAGE. THE TWO PRINCIPAL REASONS FOR THE SEVERITY OF DAMAGE WERE THAT THE HORIZONTAL AND VERTICAL ACCELERATIONS WERE MANY TIMES GREATER THAN ANY PREVIOUSLY RECORDED, AND THAT THE DAMAGED BRIDGES WERE IN THE AREA OF GREATEST INTENSITY. BRIDGE DESIGN IN THE CALIFORNIA DIVISION OF HIGHWAYS IS BASED ON ACCELERATION RECORDS OF THE EL CENTRO EARTHQUAKE OF 1940 AND INCORPORATES FACTORS NOT ACCOUNTED FOR IN THE AASHO SPECIFICATION. BRIDGES BUILT TO THE CALIFORNIA SPECIFICATION AND 3--4 MILES FROM THE CENTER OF THE EARTHQUAKE EXPERIENCED NO NOTICEABLE DAMAGE. FAILURE MECHANICS IN THE AREA OF HEAVIEST DAMAGE ARE EXPLAINED, AND DESIGN LESSONS LEARNED FROM THE EARTHQUAKE ARE RECITED.

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Filing Info

  • Accession Number: 00209798
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 7 1972 12:00AM