Analysis and Design of Integral Abutment by LRFD Method

There are no standard methods and specifications for the analysis and design of integral abutments. This paper was prepared in accordance with the analysis and design method developed for Long Lake Outlet Bridge that is part of a Federal Highway Administration (FHWA) project in Wyoming. This paper provides an analysis method for analyzing integral abutments. The subject bridge length (End-to-End) is 19.25 meters and consists of typical pretensioned side-by-side 686 mm x 1220 mm precast box girder with integral abutments founded on micropiles. The abutments were designed in accordance with AASHTO LRFD Specifications and micropiles were designed by the ASD method. Micropile design is beyond the scope of this paper and therefore is not included in this paper. Construction procedures were considered in the analysis and design of the bridge. First, the dead loads from the typical pretensioned girders and superimposed dead loads, girder and deck slab were applied as vertical loads with separate element actions. Considering that some strength has already been obtained when the barrier rail is constructed, for conservative purpose, the barrier rail load was applied with full deck slab strength and composite section to obtain the negative moment at integral abutments. Live loads were applied to the composite section to obtain negative moments, lateral and vertical loads. In order to consider longitudinal loads such as braking load, shrinkage loads and temperature loads, the finite element analysis method was applied. Soil lateral pressure and surcharge forces were taken into consideration and applied at the abutments. Since soil-structure interactions are complex, the L-pile program was used to determine the micropile contributions to the structure-soil interaction. The STAAD program was introduced to analyze the general structure behavior.

Language

  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: pp 211-221
  • Monograph Title: Integral Abutment and Jointless Bridges (IAJB 2005), March 16-18, 2005, Baltimore, Maryland

Subject/Index Terms

Filing Info

  • Accession Number: 01090118
  • Record Type: Publication
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 19 2008 10:32AM