Fatigue life assessement of prestressed concrete railway sleeper/ Norhermie Asyikin Abas

The track modernization programmed involved the use monoblock prestressed concrete sleeper instead of wooden. A concrete sleeper has to withstand repeated loading of several million cycles during its estimated life of about SO years. But to date, only a few research has taken place therefore a study on a fatigue life assessment of the sleepers is suggested. Investigation on the prestressed concrete sleeper subjected to repeated constant amplitude sine load conducted at a constant frequency of 10 Hertz was carried out. Five specimens were tested of which one specimen as for a trial test, two specimens are tested on the static loading and the other two specimens on the fatigue test. The analysis will be focussed on the response of deflection to the applied load and no of applied load cycles, stress-strain relationship and crack behavior. From the analysis, result Load versus Deflection, stress-strain relationship, behavior of crack mouth and crack length and Displacement versus no. of cycles were plotted. 75 % from yield load will be the mean load for fatigue test