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- W568710860 abstract "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. Since external tendons are physically connected to the concrete superstructure at only a few discrete locations, they act more as unbonded tendons than bonded tendons. The potential for fatigue distress in unbonded tendons is generally lower because of the long averaging length of free tendon. However, the external tendons usually have substantial angle changes concentrated over fairly short lengths at the deviators where the tendons are connected to the concrete sections. All of the basic requirements for fretting are present and accentuated at these deviators. There has been a concern that such potential for fretting might endanger the fatigue resistance of the tendon and cause premature failure. The objectives of this 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." @default.
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- W568710860 date "1992-12-01" @default.
- W568710860 modified "2023-09-27" @default.
- W568710860 title "FRETTING FATIGUE IN EXTERNAL POST-TENSIONED TENDONS. FINAL REPORT" @default.
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