Instrumentation and Testing of a Three Hinge Arch for Service Loads Increase

by John Choros, Association of American Railroads, Chicago, United States,
Eduardo Ramirez, Association of American Railroads, Chicago, United States,
Vinaya Sharma, Association of American Railroads, Chicago, United States,



Document Type: Proceeding Paper

Part of: Structures Congress XII

Abstract:

A three hinge arch railroad bridge was instrumented and tested to evaluate its condition and the required modification for increasing the service loads. Initially the structure was designed for 70 ton traffic and was upgraded to 100 ton traffic currently operating over the railway line. The line was owned by the National Railway of Mexico (FNM), in the state of Michocan. Instrumentation and measurements consisted of axial strains on selected members, and shear and moment strains on a floor beam and stringer. Weldable strain gages were used for all 32 channels. All test measurements were recorded under loadings from a work train at various speeds ranging from crawl 5 to 83kph.

Subject Headings: Railroad bridges | Load tests | Bridge tests | Arch bridges | Service loads | Axial forces | Rail transportation | Mexico

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