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Showing 1 to 4 of 4 for “"Railroad ties"”.
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Air-coupled non-destructive evaluation technology for condition assessment of railroad ties
… (NDE) technology for condition assessment of railroad ties. Ultrasonic surface waves are generated in railroad ties using an air-coupled ultrasonic sender. Surface waves are sensed at the receiving end using an array of Micro-Electro Mechanical sensors (MEMs). The resulting wave field is …
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Developing a prism qualification test to ensure adequate splitting resistance in pretensioned concrete railroad ties
… splitting resistance in pre-tensioned concrete railroad ties. The research evaluated the influence of the edge distance, compressive strength of concrete and the type of wire indentation on bond performance between prestressing steel and concrete when using different concrete mixtures. The bond …
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The de-territorialized zone: ill-defined spaces and unclassified behaviors.
… have been pulled off the pallet, or a pile of railroad ties may have buried the entire south-end of the lot. We only control the zone while it is actually under our hands, but although the internal conditions are transient, the zone itself persists. When there is little space for any activity …
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Railroad Tie Lateral Resistance on Open Deck Plate Girder Bridges
On open-deck railroad bridges, the crossties (sleepers) are directly supported by the bridge superstructure and anchored with deck tie fasteners such as hook bolts. These fasteners provide lateral resistance for the bridge ties. Currently there are no provisions to assist in the calculation of …