00677563

Component

http://onlinepubs.trb.org...trr/1994/1460/1460-004.pdf

https://scholar.google.co...aRao&publication_year=1994

An engineering explanation for the performance of single-span jointless steel bridges is presented. The performance of jointless bridges is shown to depend on the ratio of superstructure to substructure stiffness, including span length and abutment heights, load types and their combinations, time-dependent creep effects, foundation types, soil properties, and boundary conditions. A finite element analysis program was used to generate moment and deformation data, and the data were then synthesized to develop a better understanding of jointless bridge behavior. The moment and deformation data were also generated for a simply supported jointed bridge to compare with a jointless bridge. The results are presented and discussed for various loading conditions and load combinations. The results of the parametric study serve as a guide to select superstructure and substructure sizes and also to provide a tool for structural optimization. The study found that maximum midspan moment caused by external loads, including time-dependent loads such as creep and shrinkage in a jointless bridge, is about 50% of the maximum midspan moment found in a simply supported jointed bridge. The lower midspan moment in a jointless bridge as a result of a combination of all loads explains the superiority of the performance of a jointless bridge over a simply supported jointed bridge. The study also found that the effect of soil settlement and earth pressure is minimal when the jointless bridge has a hinged type of boundary condition at the footing level.

This paper appears in Transportation Research Record No. 1460, Structures. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401293

English

p. 25-36

1994

Transportation Research Record

0309060672

Figures (13) ; References (17) ; Tables (2)

Boundary value problems; Bridge substructures; Bridge superstructures; Deformation; Earth pressure; Engineering moments; Finite element method; Footings; Ground settlement; Joints; Loads; Performance; Soils; Steel bridges; Steel structures; Stiffness; Structural analysis; Structural mechanics; Studies; Types of bridges by design

Boundary conditions; Structural behavior

Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB

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