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- Dynamic design; prestressed concrete sleepers; Australian Standards; impact tests; limit states design (1)
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- Prestressed concrete railway sleepers; impact energy; fracture toughness; ultimate limit states; permissible stress (1)
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- Rail pad; state dependent model; modal testing; degradation rate; best curve fitting (1)
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Design Of Water Holding Bulkheads For Coal Mines, Verne S. Mutton, Alex M. Remennikov
Design Of Water Holding Bulkheads For Coal Mines, Verne S. Mutton, Alex M. Remennikov
Alex Remennikov
Water control has been and remains a fundamentally important aspect of underground coal mine design and operation worldwide. Mining in the vicinity of large bodies of water, below a worked out coal seam or under confined aquifer or abandoned water logged workings is always fraught with the possibility of the danger of inundation. Inrush control is now part the Fatal Hazard Protocols which is a risk based process in all operations. In modern Australian underground coal mines, in which panel layouts have been extended and production rates are approaching 10 Mtpa, there is much focus on the control of water …
State Dependent Properties Of Rail Pads, Sakdirat Kaewunruen, Alexander Remennikov
State Dependent Properties Of Rail Pads, Sakdirat Kaewunruen, Alexander Remennikov
Alex Remennikov
Rail pad is one of the main components in ballasted railway track systems. It is inserted between the rail and the sleeper to attenuate dynamic wheel/rail interaction forces, preventing the underlying railway track components from excessive stresses. Generally, the dynamic design of tracks relies on the available data, which are mostly focused on the structural condition at a specific toe load. Recent findings show that track irregularities could significantly amplify the loads on railway tracks. This phenomenon gives rise to a concern that the rail pads may experience higher deterioration rate than anticipated in the past. On this ground, an …
Relationship Between Impact Energy And Fracture Toughness Of Prestressed Concrete Railway Sleepers, Sakdirat Kaewunruen, Alexander Remennikov
Relationship Between Impact Energy And Fracture Toughness Of Prestressed Concrete Railway Sleepers, Sakdirat Kaewunruen, Alexander Remennikov
Alex Remennikov
The prestressed concrete sleepers (or railroad ties), which are installed in railway track systems as the crosstie beam support, are designed to carry and transfer the wheel loads from the rails to the ground. It is well known that railway tracks are subject to impact loading conditions, which are attributable to the train operations with either wheel or rail abnormalities such as flat wheels, dipped rails, etc. These loads are of very high magnitude but short duration. In addition, there exists the potential of repeated load experience during the design life of prestressed concrete sleepers. Prestressed concrete has played a …
Dynamic Design Guidelines For Prestressed Concrete Sleepers, Alexander Remennikov, Martin H. Murray, Sakdirat Kaewunruen
Dynamic Design Guidelines For Prestressed Concrete Sleepers, Alexander Remennikov, Martin H. Murray, Sakdirat Kaewunruen
Alex Remennikov
Current design philosophy, outlined in AS 1085.14, is based on the analysis of permissible stresses resulting from quasi-static wheel loads and essentially the static response of concrete sleepers. In general, cracking can incur when the bottom fibre stress is larger than tensile strength of concrete. Premature cracking of prestressed concrete sleepers has been detected in railway tracks. The major cause of cracking is the infrequent but high-magnitude wheel loads produced by a small percentage of “out-of-round” wheels or railhead surface defects, which are crudely accounted for in AS 1085.14 by a single load factor. Based on the current design method, …
Application Of Vibration Measurements And Finite Element Model Updating For Structural Health Monitoring Of Ballasted Railtrack Sleepers With Voids And Pockets, Sakdirat Kaewunruen, Alexander Remennikov
Application Of Vibration Measurements And Finite Element Model Updating For Structural Health Monitoring Of Ballasted Railtrack Sleepers With Voids And Pockets, Sakdirat Kaewunruen, Alexander Remennikov
Alex Remennikov
Although vibration measurements are very useful and common in practice nowadays in many applications related to mechanical, civil, and aerospace engineering, the utilisation in railtrack infrastructure and facilities is not widely established. This chapter deals with the application of vibration measurements and finite element model updating to the assessment of ballasted railtrack sleepers, in particular with a void and pocket condition. It describes the concept of vibration measurements and the understanding into the dynamic behaviour of ballasted railtrack sleepers. It discusses briefly on the development of finite element model of in-situ sleeper and its updating. Then, the application to structural …
Trends In Vibration-Based Structural Health Monitoring Of Railway Sleepers, Sakdirat Kaewunruen, Alexander Remennikov
Trends In Vibration-Based Structural Health Monitoring Of Railway Sleepers, Sakdirat Kaewunruen, Alexander Remennikov
Alex Remennikov
Today vibration-based structural health monitoring (SHM) has been widely used in many applications, i.e. mechanical, civil, or aerospace engineering. Over last decades, SHM has been investigated for uses in those applications as an alternative tool to the costly visual inspections. Most of the SMH applications make effective use of experimental modal analysis and finite element model updating whereas this approach consumes reasonable cost for instrumentation and device (generally only a few accelerometers installed on the structure). In railway communities however, SHM technologies have not been widely adopted as the rail track engineers lack efficient tools and instrumentation to process the …
Dynamic Properties Of Railway Track And Its Components : A State-Of-The-Art Review, Sakdirat Kaewunruen, Alexander Remennikov
Dynamic Properties Of Railway Track And Its Components : A State-Of-The-Art Review, Sakdirat Kaewunruen, Alexander Remennikov
Alex Remennikov
Recent findings indicate one of major causes of damages, which is attributed to the resonant behaviours, in a railway track and its components. Basically, when a railway track is excited to generalised dynamic loading, the railway track deforms and then vibrates for certain duration. Dynamic responses of the railway track and its components are the key to evaluate the structural capacity of railway track and its components. If a dynamic loading resonates the railway track’s dynamic responses, its components tend to have the significant damage from excessive dynamic stresses. For example, a rail vibration could lead to defects in rails …
Designing Explosion Rated Ventilation Seals For Coal Mines Using High-Fidelity Physics-Based Computer Modelling, Ian Verne Mutton, Alexander Remennikov
Designing Explosion Rated Ventilation Seals For Coal Mines Using High-Fidelity Physics-Based Computer Modelling, Ian Verne Mutton, Alexander Remennikov
Alex Remennikov
Questions have been raised about the effectiveness of ventilation control devices (VCDs) to safely resist explosions during their intended life. This functionality depends on the ability of the VCDs and in particular seals to withstand changes in the behaviour of the strata, particularly where longwall abutments influence the stress regime in and around the chain pillars. As a consequence of an explosion impact on a seal, the surrounding strata could experience increased loads possibly resulting in permanent deformation and requiring grout consolidation. These aspects of seal design have been investigated using advanced numerical analysis. Globally since the early 20th century, …