United States Department of Transportation
i
Safety factor increase to fatigue limit states through shear spiking for timber railroad bridge rehabilitation - phase I.
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2014-11-01
[PDF-2.44 MB]
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Abstract:The overall project is to demonstrate the effectiveness of shear spiking (technique alrea
dy developed
through a previous project). Many timber railroad bridges are deficient but i
t is too costly to replace them;
hence
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inexpensive repair techniques are needed. The proposed project will provide the necessary
documentation of the effectiveness o
f this newly developed mitigation technique under realistic loads
using new equipment available from a National Science Foundation grant to Colorado State University.
This will ultimately be accomplished through a series of spatio
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temporal fatigue tests on
stringers for both
non
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repaired and repaired. The timing and locations of the loading will be determined from influence line
analysis of a typical freight train(s). The results will be used as leverage and/or proof
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of
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concept to
approach the American Rail
way Association for additional funding. This report presents the intermediate
results of the project, which is
designated herein as Phase I.
Phase I focused on development of the
actuator control algorithm
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which was successfully tested in the Colorado Sta
te University Structural
Engineering Laboratory in the spatio
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temporal test frame using seven actuators simultaneously in force
control.
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