Case Studies of Displacement-Induced Fatigue

by John M. Kulicki, Modjeski & Master, Harrisburg, PA, USA,
Dennis R. Mertz, Modjeski & Master, Harrisburg, PA, USA,



Document Type: Proceeding Paper

Part of: Materials and Member Behavior

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) | Girder bridges | Fatigue (material) | Case studies | Arch bridges | Span bridges

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