This paper and its companion (Johnson et al. 2015) summarize the design assumptions, processes, and analytical methods that were employed in the seismic retrofit of an historic bridge. The North Torrey Pines Road Bridge in Del Mar, California, was built in 1933 and is eligible for listing in the National Register of Historic Places. The bridge had been classified as structurally and seismically deficient and functionally obsolete. A seismic retrofit project was performed to improve the seismic performance of the bridge while preserving its aesthetic and historic character. This paper describes the geotechnical and seismic hazard aspects of the retrofit project, which included deterministic and probabilistic seismic hazard analysis, earthquake time-history development, site-response analyses, evaluation of liquefaction triggering and its consequences, seismic slope displacement evaluations, and soil-structure interaction analyses. Geotechnical retrofit measures, including ground improvement and new abutment foundations, were developed and tailored to improving seismic performance to levels that were compatible with the seismic design criteria. The information presented in these two papers provides a case history that can serve as a point of reference for practicing engineers facing similar challenges.
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Research Article|
November 01, 2015
North Torrey Pines Bridge Seismic Retrofit: Part I, Seismic Hazard and Geotechnical Design
James R. Gingery, M. EERI
;
James R. Gingery, M. EERI
a)
Kleinfelder, 550 West C Street, Suite 1200, San Diego, CA 92120
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Kevin W. Franke, M. EERI
;
Kevin W. Franke, M. EERI
b)
Brigham Young University, 368 Clyde Building, Provo, UT 84602
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Jorge F. Meneses, M. EERI
;
Jorge F. Meneses, M. EERI
c)
Group Delta Consultants, 9425 Activity Road, San Diego, CA 92126
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Zia Zafir, M. EERI
Zia Zafir, M. EERI
d)
Kleinfelder, 2882 Prospect Park, Suite 200, Rancho Cordova, CA 95670
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Earthquake Spectra (2015) 31 (4): 2195–2210.
Article history
received:
18 Oct 2012
accepted:
08 Apr 2014
first online:
01 Jun 2020
Citation
James R. Gingery, Kevin W. Franke, Jorge F. Meneses, Zia Zafir; North Torrey Pines Bridge Seismic Retrofit: Part I, Seismic Hazard and Geotechnical Design. Earthquake Spectra 2015;; 31 (4): 2195–2210. doi: https://doi.org/10.1193/101812EQS310M
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Index Terms/Descriptors
- acceleration
- alluvium
- Asia
- attenuation
- bedrock
- body waves
- boreholes
- bridges
- California
- clastic rocks
- clastic sediments
- claystone
- coastal environment
- compaction
- conglomerate
- Duzce earthquake 1999
- earthquakes
- elastic constants
- elastic waves
- engineering geology
- faults
- foundations
- geologic hazards
- ground motion
- guided waves
- Landers earthquake 1992
- liquefaction
- Loma Prieta earthquake 1989
- Middle East
- natural hazards
- Pacific Ocean
- peak ground acceleration
- penetrometers
- recurrence interval
- risk assessment
- S-waves
- San Diego County California
- sandstone
- sedimentary rocks
- sediments
- seismic waves
- seismicity
- shear modulus
- slope stability
- soil profiles
- soils
- stiffness
- surface waves
- Turkey
- United States
- velocity
- Rose Canyon Fault
- Lusardi Formation
- North Torrey Pines Bridge
Latitude & Longitude
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