Historical Progression of Los Angeles Metro Seismic Design Criteria
Publication: Lifelines 2022
ABSTRACT
The Los Angeles Metro transit system has been undergoing a rapid expansion since the 1980s. The expansion includes complex structures comprising elevated structures with major bridges, circular tunnels, oval caverns, rectangular tunnels, and underground stations. In addition, the Metro transit system overlaps with the lifelines of other jurisdictions, including the California Department of Transportation, Los Angeles Bureau of Engineering, and many others. The Los Angeles area is also subject to a significant seismic hazard. The seismic hazard creates risks of damage due to fault rupture, ground shaking, liquefaction, landslides, and seismic settlement. Accordingly, Metro provides the Supplemental Seismic Design Criteria as part of its overall Design Criteria to provide a comprehensive basis for design of new structures for seismic hazards. Metro’s design criteria have progressed over time based on capabilities in the engineering community, new research, and changes in parallel standards such as Caltrans standards and ASCE 7. Metro’s criteria have served as models for other lifeline system design criteria, and are anticipated to continue to change over time based on additional capabilities and knowledge in the engineering community. This work reviews the history of changes of the Metro Supplemental Seismic Design Criteria. Metro’s criteria anticipate changes to computational methodologies used for design of Metro structures, including three-dimensional seismic response analysis and structure-soil-underground structure interaction with Metro facilities. The Metro criteria could be applicable to other codes and standards of practice utilized by the profession for transportation and other lifelines structures in seismic regions.
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REFERENCES
Agbabian Associates. 1985. “Baseline Dynamic Analyses in Support of Supplemental Seismic Design Criteria – Metro Rail Project,.”
Basarah, Y. I., Numanoglu, O. A., and Hashash, Y. M. A. 2021. “Numerical Modeling of Higher Mode Effects of Adjacent Tall Buildings on Seismic Response of a Tunnel,” International Foundations Congress & Equipment Expo, Dallas, Texas.
Gillis, K. 2015. Seismic Response of Shallow Underground Structures in Dense Urban Environments, Ph.D. Dissertation, University of Colorado.
Gillis, K., Dashti, S., Hashash, Y., Jones, C., Musgrove, M., and Walker, M. 2015. “Seismic Performance of Shallow Underground Structures Adjacent to Tall Buildings: A Centrifuge Experimental Study,” Proceedings of the 6th International Conference on Earthquake Geotechnical Engineering, November 1-4.
Hashash, Y. M. A., Hook, J. J., Schmidt, B., John, I., and Yao, C. 2001. “Seismic design and analysis of underground structures,” Tunnelling and Underground Space Technology, 16(4), 247-293.
Hashash, Y. M. A., Dashti, S., Musgrove, M., Gillis, K., Walker, M., Ellison, K., and Basarah, Y. I. 2018. “Influence of Tall Buildings on Seismic Response of Shallow Underground Structures,” Journal of Geotechnical and Environmental Engineering, 144(12).
Hashash, Y. M. A., Musgrove, M. I., Harmon, J. A., Ilhan, O., Xing, G., Numanoglu, O., Groholski, D. R., Phillips, C. A., and Park, D. 2020. DEEPSOIL 7.0, User Manual. Urbana, IL, Board of Trustees of University of Illinois at Urbana-Champaign.
Hudson, M. B., Choi, S. H., Hansmire, W. H., and Hudson, K. 2021. “Seismic Design of Los Angeles Underground Transit Stations,” Proceedings of the ASCE Lifelines Conference, Los Angeles, California.
Idriss, I. M., and Sun, J. I. 1992. User’s Manual for SHAKE91, A Computer Program for Conducting Equivalent Linear Seismic Response Analyses of Horizontally Layered Soil Deposits. Center for Geotechnical Modeling, University of California, Davis.
Kuesel, T. R. 1969. “Earthquake Design Criteria for Subways.” Journal of the Structural Division, American Society of Civil Engineers, 95(ST6), June.
Metro. 2017. Metro Rail Design Criteria Section 5 – Structural/Geotechnical Revisions issued November 20.
Metro Rail Transit Consultants. 1984. Supplemental Criteria for Seismic Design of Underground Structures, Metro Rail Transit Consultants.
Merritt, J. L., Monsees, J. E., and Hendron, A. J. 1985. “Seismic Design of Underground Structures,” Proceedings of the 1985 Rapid Excavation and Tunneling Conference, New York, New York.
Monsees, J. E., and Merritt, J. L. 1984. “Seismic Design of Underground Structures – Southern California Metro Rail Project,” ASCE Conference on Lifeline Earthquake Engineering: Performance, Design, and Construction, San Francisco, California.
Monsees, J. E., and Merritt, J. L. 1991. “Earthquake Considerations in Design of the Los Angeles Metro,” ASCE Conference on Lifeline Earthquake Engineering, Los Angeles, California.
Pandaya, N. P., Lai, C. C., and Mohr, L. J. 1998. “Structural Design Of Underground Stations For Eastside Extension Of Los Angeles Metro Rail System,” Proceedings of the 1998 Rapid Transit Conference, San Diego, California.
Peck, R. B., Hendron, A. J., and Mohraz, B. 1972. “State of the Art of Soft Ground Tunneling,” First North American Rapid Excavation and Tunneling Conference, ASCE-AIME, Chicago, Illinois.
St. John, C. M., and Zahrah, T. F. 1985. Aseismic Design of Underground Structures, Agbabian Associates, June.
Southern California Rapid Transit District. 1968. “Preliminary Design Criteria and Outline Specifications,”, May.
Southern California Rapid Transit District. 1983. Seismological Investigation and Design Criteria, May.
Southern California Rapid Transit District. 1985. Metro Rail Project – System Design Criteria & Standards, Vol. 2 – Civil/Structural, May.
Southern California Rapid Transit District. 1987. Metro Rail Project - Project Management Plan for MOS-1 Construction, April.
Wang, J.-N. J. 1993. Seismic Design of Tunnels – A Simple State-of-the-Art Design Approach, Parsons Brinckerhoff Quade & Douglas, Inc.
Deepsoil (Hashash et al. 2020) or Shake91 (Idriss and Sun, 1992).
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Published online: Nov 16, 2022
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