Case Studies of Displacement-Induced Fatigueby John M. Kulicki, Modjeski & Master, Harrisburg, PA, USA,
Dennis R. Mertz, Modjeski & Master, Harrisburg, PA, USA,
Abstract: The potential for displacement-induced cracking is a result of the co-existence of two conditions: an abrupt change in stiffness and a periodic force opposing it. Case studies of retrofitted bridges which illustrate the concepts of displacement-induced fatigue cracking are presented. A complex analysis of displacement-induced stress fields in a tied-arch span illustrates the degree of difficulty involved in determining these stresses. Examples of two- and multi-girder bridges, and another tied-arch span demonstrate the simple approach of retrofitting or designing to avoid displacement-induced fatigue without the complex quantification of the stress field.
Subject Headings: Stress analysis | Displacement (mechanics) | Fatigue (material) | Bridge design | Case studies | Cracking | Girder bridges | Rehabilitation
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