Abstract
Distortion-induced fatigue cracking from out-of-plane deformation in web gaps of bridge connection details is examined. This type of fatigue cracking results from interaction of various structural members during live loading of a structure and produces unanticipated distortion and high localized stresses. Although this type of problem is not confined to bridges, this paper focuses on bridge types and members that are susceptible to distortion-induced fatigue cracking at web gaps. This includes both plate-girder and box-girder bridges, as well as tied-arch bridges with box- and plate-girder members. Member details include transverse connection plates for cross-bracing and diaphragms, longitudinal gusset-plate details, and floor beam end connections. The crack development behavior is examined using field observations and measurements, as well as results from large-scale laboratory experiments. Recommendations for retrofitting distortion-induced fatigue damage are given, along with design alternatives to eliminate or minimize the occurrence of distortion-induced fatigue cracking.
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