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Longitudinal Loads in Railway Bridges
Author(s) and Affiliation(s):
Douglas A. Foutch and Daniel H. Tobias Department of Civil Engineering University of Illinois at Urbana-Champaign, Urbana, IL
Principal Investigator:
Douglas A. Foutch
Association of American Railroads and the National Science Foundation
Research Start Date:
August 1, 1995
Expected Completion Date:
October 31, 1996
Research Objectives:
AC-traction locomotives have recently been introduced into service on heavy-haul rail lines. These locomotives have a higher tractive effort than standard DC-traction locomotives. The larger than usual longitudinal tractive and braking forces transmitted through the track structure to railway bridges has caused some concern in the industry. The forces and stresses in typical bridges that are caused by AC-traction locomotives are currently under investigation. A number of analytical studies on common types of railway bridges are currently under way. In the near future, an experimental study of a railway bridge subjected to AC-traction locomotive loadings is planned.
Expected Products or Deliverables:
An estimate of the longitudinal loads transmitted to critical members of typical railway bridges by AC-traction locomotives is the primary focus of this research program. Further utility is gained from the finite element modeling of the track structure. In general, most studies of the longitudinal loads in track structures caused by passing trains have tended to concentrate on more localized effects. The currently developed models employ modern finite element techniques which allow researchers and practicing engineers to better simulate actual loading and response conditions in the field.

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