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原文传递 Fretting Fatigue in External Post-Tensioned Tendons; Final research rept

题名：	Fretting Fatigue in External Post-Tensioned Tendons; Final research rept
作者：	Ryals, K. K.; Breen, J. E.; Kreger, M. E.
关键词：	Girder bridges; Post tensioning; Fatigue(Materials); Tendons; Structural steels; Concrete durability; Highway bridges; Bridge design; Cracking(Fracturing); Steel wires; Concrete structures
摘要：	External post-tensioning tendons are frequently used in the construction of multiple-span box girder bridges. They occur particularly frequently in long bridges erected using span-by-span construction as in elevated urban freeways and over water viaducts. In addition, they have been successfully used in a number of bridge strengthening projects. The objectives of the study were to build and cyclically load tendons with concentrated angle changes representative of external tendons and typical deviator details. The specimens were to be examined for evidence of fretting fatigue. Recommendations for changes in design or construction techniques were to be made to reduce the potential for harmful fretting fatigue. No evidence of fretting fatigue worse than that found with internal post-tensioned tendons was found. A wide range of prestressed concrete fatigue applications was examined and a comprehensive design procedure for fatigue applications was suggested.
总页数：	96p
报告类型：	科技报告