Seismic Design Considerations : Volume I, Technical Approaches and Results; Volume II, Appendices II-VIII
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2012-03-01
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Alternative Title:Seismic Design Considerations : Vol. I, Technical Approaches and Results;Seismic Design Considerations : Volume II, Appendices II-VIII;
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Edition:Final report, Jan. 2008-Mar. 2012.
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Abstract:NJDOT has adopted “AASHTO Guide Specifications for LRFD Seismic Bridge Design” approved by the Highway
Subcommittee on Bridges and Structures in 2007. The main objective of research presented in this report has
been to resolve following issues for an effective implementation of AASHTO Guide Specifications: (i) AASHTO
Guide Specifications don’t provide any specific guidelines for classification and performance requirements for
critical bridges. This issue is resolved by proposing performance requirements and classification criteria for
critical bridges in New Jersey. (ii) Guide Specifications present displacement based approach, which is
significantly different than the force-based approach in previous versions of seismic guidelines. Nine examples
of reinforce concrete and steel bridges of different characteristics (spans, skew, etc.) illustrating the use of newly
adopted seismic guide specifications have been developed for training of engineers in New Jersey. (iii) NJDOT
maintains an extensive electronic database of soil boring logs for the State of New Jersey. A zip-code based soil
site map for New Jersey has been developed by analyzing soil boring data and other available New Jersey soil
information. This map can be used for a rapid seismic hazard evaluation for the entire state or for a network of
bridges in the state. (iv) AASHTO Guide Specifications introduce seismic design categories based on local
seismicity and soil properties. Using the seismic soil map and zip code based seismic spectra provided in the
AAHSTO Guide Specifications, seismic design category maps for critical and standard bridges in New Jersey
have been developed. A detailed analysis has also been carried out to develop liquefaction potential maps for
the state of New Jersey. These maps can be used to determine the need for a detailed liquefaction analysis for
a particular bridge site. A detailed guideline on developing site-specific spectra has also been developed, since
AASHTO Guide Specifications recommend site-specific spectra for critical bridges. (v) Existing bridges in New
Jersey are required to be retrofitted on the basis of 2006 Edition of the “Seismic Retrofitting Manual for Highway
Structures: Part 1 – Bridges”. Simplified guidelines for seismic retrofit of existing bridges, that are consistent
with guidelines for the design of new bridges in AASHTO Guide Specifications, have been developed.
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