Effects of New LRFD Seismic Bridge Design Specifications to a ‘Normal’ Typical Bridge in New York State

In July 2007, American Association of State Highway and Transportation Officials (AASHTO) Subcommittee on Bridges and Structures adopted revised seismic provisions for LRFD Bridge Design Specifications and a new AASHTO Guide Specifications for Load and Resistance Design factor (LRFD) Seismic Bridge Design. The design earthquake return period has increased from 500 to 1000 years. Base LRFD specifications are founded on a ‘Force-Based’ approach while the Guide Specifications are founded on a ‘Displacement-Based’ approach. For the new design of an ordinary (non-critical) bridge in a low seismic zone such as in the State of New York, a New York City location is chosen. Typical multi span bridges with fixed bearings at a pier and expansion bearings at abutments and at remaining piers are selected and are classified as ‘Other (Normal) Bridges’. This paper presents an overview of the application of the two new seismic specifications, Base and Guide Specifications, and discusses the similarities and the differences of the two specifications when applied to the selected bridges in a low seismic Eastern United States Zone. This paper also lists some discrepancies of the two specifications as compared to the past AASHTO Division IA Standard Specifications. In January 2006, the Federal highway Administration (FHWA) released a new ‘Seismic Retrofitting Manual’. Bridge examples in the same geographical location are screened and assessed as per the retrofitting manual.

• Corporate Authors:

  Multidisciplinary Center for Earthquake Engineering Research

  State University of New York, 107 Red Jacket Quadrangle, P.O. Box 610025
  Buffalo, NY  United States  14261-0025
• Authors:
  • Taneja, Rajesh
  • Debessay, Mengisteab
  • Yannotti, Arthur P
• Conference:
  • Sixth National Seismic Conference on Bridges and Highways
  • Location: Charleston SC, United States
  • Date: 2008-7-28 to 2008-7-30
• Publication Date: 2008

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Maps; References; Tables;
• Pagination: 12p
• Monograph Title: Sixth National Seismic Conference on Bridges and Highways: Seismic Technologies for Extreme Loads

Subject/Index Terms

• TRT Terms: Bridge design; Earthquake resistant design; Load and resistance factor design; Retrofitting; Seismicity; Specifications
• Identifier Terms: AASHTO LRFD Bridge Design Specifications
• Uncontrolled Terms: Displacement (Structural); Multispan bridges
• Geographic Terms: New York (State)
• Subject Areas: Bridges and other structures; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01355854
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 26 2011 1:58PM