Fatigue Evaluation of Steel Bridges (2012) / Chapter Skim
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1 Fatigue Evaluation of Steel Bridges The following report summarizes the results of the research effort undertaken as part of NCHRP Project 12-81. This research project has a focus on Section 7 "Fatigue Evaluation of Steel Bridges" in AASHTO's The Manual for Bridge Evaluation (MBE)
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2To address these needs a number of analytical and experimental studies were performed. The analytical studies were used to examine various aspects that influence the fatigue behavior.
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3 retrofits or repairs. The following observations were made based on the tack weld analysis and testing results: • Finite element analysis indicates that the weld toe of the first line of tack welds experiences the maximum stress.
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4subcomponent girder web at the web gap for all girder sections tested when subjected to out-of-plane distortions. Although the cracks initiated quickly, growth slowed considerably as it propagated away from the web gap region due to softening of the connection.
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