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Dynamic Responses Of Railway Bridge Ends: A Systems Performance Improvement By Application Of Ballast Glue/Bond, Sakdirat Kaewunruen
Dynamic Responses Of Railway Bridge Ends: A Systems Performance Improvement By Application Of Ballast Glue/Bond, Sakdirat Kaewunruen
Sakdirat Kaewunruen
Accelerated deterioration of railway bridge approaches often induces downtime or restricted railway operation; and importantly causes more frequent maintenance, which is costly and time-consuming. Such deterioration is believed to occur because of high dynamic impact loading from: the difference of stiffness between the railway track and the bridge; and the poor condition of the track support at the bridge ends. The abrupt change in track stiffness often causes accelerated degradation of the track geometry and components and poor ride quality, demanding higher maintenance. There are a number of improvement programs that have been implemented in order to provide a smooth …
Simulating Shock Loads In Railway Track Environments: Experimental Studies, Alexander Remennikov, Sakdirat Kaewunruen
Simulating Shock Loads In Railway Track Environments: Experimental Studies, Alexander Remennikov, Sakdirat Kaewunruen
Alex Remennikov
The nature of loading conditions on railway tracks is mostly of regular loading patterns due to passage of wheels of rolling stock. Dynamic forces on a railway track caused by abnormal impacts due to wheel flats, rail dips, etc. are usually highly impulsive with short durations and high frequency contents. There have been a number of investigations on the wheel/rail impacts due to wheel and rail imperfections and track abnormalities. However, the effect of railway track environments including ballast and rail pads has yet been addressed. Intensive studies on the impact resistance of railway concrete sleepers have been conducted at …
Low-Velocity Impact Analysis Of Railway Prestressed Concrete Sleepers, S. Kaewunruen, Alexander Remennikov
Low-Velocity Impact Analysis Of Railway Prestressed Concrete Sleepers, S. Kaewunruen, Alexander Remennikov
Alex Remennikov
Railway prestressed concrete sleepers are required to resist repetitive impact stress waves from dynamic interactions between the rail vehicle and track infrastructure in services. The magnitude of the shock load relies on various factors such as axle load, types of wheel/rail imperfections, speeds of vehicle, track stiffness, etc. This paper demonstrates the application and development of finite element modelling to predict the dynamic responses of prestressed concrete sleepers, particularly under a variety of controlled low-velocity, drop-weight impact loads. The numerical model of prestressed concrete sleeper has been developed using a finite element package, LS-Dyna. It has been verified by the …