Reducing seismic risk to highway mobility : assessment and design examples for pile foundations affected by lateral spreading.

Details

• Alternative Title:
  Reducing seismic risk to highway mobility : assessment and design examples for pile foundations affected by lateral loading.
• Creators:
  Ashford, Scott A. ; Scott, Michael H. ; Rayamajhi, Deepak
• Corporate Creators:
  Oregon State University. School of Civil and Construction Engineering
• Corporate Contributors:
  United States. Department of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  • Bridge foundations
  • Liquefaction
  • Deformation
  • Earthquakes
  • Pile foundations
  • Seismicity
  • Bridge design
  • Earthquake resistant design
  • Finite element method
• Publication/ Report Number:
  OTREC-RR-13-05
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon
• Corporate Publisher:
  Oregon Transportation Research and Education Consortium ; Oregon. Dept. of Transportation. Research Unit
• Abstract:
  Damage in pile supported structures due to liquefaction and liquefaction induced deformation were reported in past earthquakes around the world ; (e.g., Ansal et al. 1999; Seed et al. 1990; EERI 2010, EERI 2011; GEER 2010a, GEER 2010b, GEER 2011). For example, a reconnaissance report ; from a recent subduction zone event, the 2010 Chile earthquake (Mw=8.8), showed the pervasive nature of liquefaction and liquefaction-induced ; lateral spreading damage to bridge foundations (GEER 2010a, Yen et al. 2011). In terms of seismic hazard, the Pacific Northwest shares similar ; conditions from a Cascadia Subduction Zone (CSZ) earthquake source with the expected earthquake magnitude of 9.0 (Mw) and return period of ; 300 years (Atwater et al. 1995, Atwater and Hemphill-Halley 1997). The risk and damage from a CSZ earthquake event is widely recognized by ; the Oregon Department of Transportation (ODOT) as presented in a report by ODOT (2009). A large number of bridges were found to be ; vulnerable to a CSZ event, and repair and replacement costs of Oregon bridges have been estimated at more than 1 billion USD (ODOT 2009). ; Moreover, thousands of bridges require some kind of modification and/or seismic retrofitting to the foundation in order to improve seismic ; performance under liquefaction induced lateral spreading. ; To evaluate the seismic performance of bridge foundations and liquefaction mitigation alternatives, ODOT/OTREC funded collaborative ; research between Oregon State University (OSU), University of California at Davis (UCD), University of California at San Diego (UCSD), ; Hayward Baker Inc., and Pacific Earthquake Engineering Research Center (PEER). The main objectives of the research were to develop design ; charts for different liquefaction mitigation alternatives and to develop methodologies for assessing the performance of bridge pile foundations in ; laterally spreading ground. ; The cooperative research focuses on two aspects of liquefaction and liquefaction induced lateral spreading: (1) ground improvement methods, ; particularly using stone columns and deep soil mixing (DSM) grids, and (2) assess the seismic performance of bridge foundations (e.g., drilled ; shaft, pile groups) and seismic retrofitting alternatives for the bridge foundation. Stone columns for liquefaction mitigation and pile groups ; foundation assessment were investigated by the OSU team, while DSM and large diameter piles/shafts alternatives were investigated by the ; UCD team. Research teams used OpenSees (http://opensees.berkeley.edu/), an open source computational platform for three dimensional (3D) ; finite element (FE) modeling and analysis. OpenSeesPL, a graphical user interface developed by the UCSD team, was used to investigate ; liquefaction mitigation alternatives (i.e., stone columns and DSM grids) and the performance of pile foundations in liquefaction induced laterally ; spreading ground.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26024/dot_26024_DS1.pdf
• File Type:
  [PDF - 4.39 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:5f6bc4a6b06d8dd750f70efb570f5f5bb3a370318cd65d0e3675982fb20b10083e7a1a117307b4d75bf549379428c3db673f0dc30a70bba18d569e9324df3ed5