Load Tests of a through Truss Bridge before and after the Installation of an Arch-Superposition Scheme.

Abstract

Because so many pinned and riveted truss bridges currently are classified as structurally deficient, a need to develop an economical, practical alternative to bridge replacement exists. Rehabilitation by an arch-superposition scheme can effectively reduce truss member stresses and increase the bridge load capacity. This was verified by load tests conducted both before and after the installation of the arch-superposition scheme to Northumberland Country bridge number 50. The results showed that truss member stresses and deflections can be reduced at least 50% by the scheme which is approximately one-seventh the cost of bridge replacement. Bridge number 50 has been upgraded from a six to a 20 ton inventory rating. The theory, economics, and construction feasibility of the arch-superposition scheme have been verified.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1983
Accession Number
ADA139140

Entities

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  • R. E. Haller

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  • Air Force Institute of Technology

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  • Air Platforms

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  • Air Force
  • Bending Moments
  • Civil Engineering
  • Construction
  • Engineering
  • Field Tests
  • Load Distribution
  • Modulus Of Elasticity
  • Strain Gages
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  • Naval Architecture and Marine Engineering.
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  • Structural Health Monitoring of Composite Structures.