Office of Special Funded Projects
For More Information
All structures - both state and local - that have the Type Selection meeting held on or after October 1, 2006 must be designed using the new LRFD specifications. Currently the primary design specification for California structures consists of the following:
The Seismic Design Criteria will continue to be the governing specification for the seismic design of structures. Other Caltrans manuals that govern structure design such as Bridge Design Aids and Bridge Memos to Designers will eventually be updated in order of importance to design production. The Bridge Design Practice manual will eventually be rewritten.
Bridge decks and soffits will be designed per the new Memo to Designers 10-20.
As stated in the CA Amendments section 10.5.1 foundations for intermediate supports are to be designed using LRFD. This means that the entire bent/pier system - cap, columns/pier, footing, and foundation soil or piles, are to be designed using LRFD. CA Amendments sections 10.5.1 and 11.5.1 state that abutments are to be designed using SLD and the Caltrans Bridge Design Specifications dated April 2000. Current Caltrans design practice is to design the entire abutment using SLD with the loads obtained from the new HL93 load group.
The General Notes will state which elements of the structure are designed by the old specifications and which are designed by the new. The proper format of the General Notes is shown in Memo to Designers 1-47.
Following are links to documents issued by the Federal Highway Administration and the California Department of Transportation ordering the implementation of the LRFD Specifications.
|Federal Highway Administration|
|June 2000: Load and Resistance Factor Design Policy Memorandum|
|January 2007: Clarification of Load and Resistance Factor Design Policy Memorandum|
|California Department of Transportation|
|December 2011 - Implementation Memorandum for revisions to CA Amendments.|
|September 2010 - Implementation Memorandum for Earth Retaining Systems, Abutments, and Underground Structures.|
|January 2009- Implementation of the 4th Edition of the AASHTO LRFD Bridge Design Specifications|
|March 2007 : Implementation of the AASHTO LRFD Bridge Design Specifications|
|April 2006: Implementation of the AASHTO LRFD Bridge Design Specifications|
|January 2006: Notice of Change in the Bridge Design Specifications|
|FOR MORE INFORMATION|
|For structures on the State highway system contact the Liaison Engineer assigned to your Transportation District:|
|Office of Special Funded Projects - Liaison Engineers|
|For structures on local roads and highways contact the Local Assistance Engineer assigned to your city or county:|
|Office of Structures Local Assistance Telephone 916-227-3330|