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RISDevelopment and Implementation of a Laser–Camera–UAV System to Measure Total Dynamic Transverse Displacement
Publisher: ASCE
Abstract: Railroad bridge inspectors are interested in measuring the maximum total transverse displacement of railroad bridges under trains, but these values are generally not easy to obtain in the field without sensors. Engineers ...
Lateral Loads and Displacements of Railroad Bridges from Field Investigations
Publisher: ASCE
Abstract: The progressive increase in loads and frequency of trains traversing over aging railway infrastructure can lead to large lateral forces and displacements that could potentially cause derailment and problems related to ...
Measuring Total Transverse Reference-Free Displacements for Condition Assessment of Timber Railroad Bridges: Experimental Validation
Publisher: American Society of Civil Engineers
Abstract: Today, the railroad industry carries 4% of the United States’ total freight ton-miles over 1, bridges spanning over 225, km (14, mi) of rail tracks and the demand for railroads will increase by 88% by 235. Railroads ...
Real-Time Reference-Free Displacement of Railroad Bridges during Train-Crossing Events
Publisher: American Society of Civil Engineers
Abstract: Today, railroads carry 40% of the United States’ freight tonnage, and the demand for this service is expected to double in 20 years. The railroad infrastructure contains more than 100,000 bridges spanning over 225,000 km ...
Hybrid Model for Railroad Bridge Dynamics
Publisher: American Society of Civil Engineers
Measuring Total Transverse Reference-Free Displacements of Railroad Bridges Using Two Degrees of Freedom: Experimental Validation
Publisher: American Society of Civil Engineers
Abstract: Knowing the extent of displacement experienced by railroad bridges when loaded is useful when evaluating the safety and serviceability of the bridge. However, measuring displacements under train crossing events is difficult. ...
Design of a Pressure Measuring Syringe
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Endotracheal intubations are performed on thousands of patients each day. Intubation is achieved by inserting a small plastic tube down a patient’s trachea, allowing oxygen and anesthetics to ...
Reference-Free Displacements for Condition Assessment of Timber Railroad Bridges
Publisher: American Society of Civil Engineers
Abstract: Current railroad bridge inspection and rating practices include observing bridge movement under live loads to help assess bridge conditions. Recent research has shown that transverse displacements of timber trestle bridges ...
Experimental Analysis on Effectiveness of Crash Beams for Impact Attenuation of Overheight Vehicle Collisions on Railroad Bridges
Publisher: ASCE
Abstract: Collisions between overheight semitrailer trucks with low-clearance railroad bridges are one of the leading causes for railroad traffic interruptions on bridges in the United States. Current sensing efforts to inform drivers ...
Noncontact Dynamic Displacement Measurement of Structures Using a Moving Laser Doppler Vibrometer
Publisher: American Society of Civil Engineers
Abstract: Monitoring of bridge displacements is critical for safe and cost-effective railroad operations. One of the essential parameters for determining the serviceability of the bridges is the dynamic displacement of the bridge ...