Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Guardrail"”.
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Harmful events in guardrail crashes
While guardrails are intended to reduce the severity of ran-off-road crashes, even the best designs installed in the most appropriate locations cannot eliminate all serious injuries and fatalities associated with guardrail crashes. The performance of guardrails has been examined through controlled …
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Manufacture and rehabilitation of guardrail posts using composite fabrics
… uses approximately 50,000 wood and 200,000 steel guardrail posts on an annual basis. The need to develop guardrail posts made of a different material is motivated by the high cost of steel, along with the greater difficulty associated with driving large diameter wood posts.;The primary objective …
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Limits of Permissible Damage in Strong-Post W-Beam Guardrail
Crash tests of strong-post w-beam guardrail have focused entirely on the performance of new guardrail. The risk posed by minor damage modes, e.g. small deflections and missing posts, has never been evaluated. Using finite element models validated by real world crash tests, this study assessed the …
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Serious and Fatal Injury Risk in Road Departure Crashes with Guardrail
Guardrails are a key safety feature of modern roadways. Collisions with many roadside hazards, e.g. trees, poles and culverts, can be dangerous and guardrail prevents many crashes with such hazards. However, using guardrail safely and effectively is a challenging problem in itself. This research …
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Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design
<p>Roadside barriers such as guardrails are fundamental to roadway safety, providing a critical last line of defense in preventing vehicles from leaving the roadway and impacting potential hazards. As vehicles are ever changing, it is necessary for guardrail design to adapt in response. Many …
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Investigation of W-Beam Energy-Absorbing Guardrail End Terminal Safety Performance Using Finite Element Modeling
Guardrails were designed to deter vehicle access to off-road areas and consequently prevent hitting rigid fixed object alongside the road (e.g., trees, utility poles, traffic barriers, etc.). However, guardrails cause 10% of deaths of vehicle-to-fixed object crashes which has attracted attention in …
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Finite Element Modeling of Occupant Injury Risk and Crash Performance of W-Beam Guardrail Barriers in Roadside Crashes
… at investigating the crash performance of w-beam guardrail barriers in vehicle-roadside crashes using the finite element method. The developed roadside barrier models can be used to assess the occupant injury risk, vehicle performance, and damage to guardrail barriers during a roadside accident. …
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Injury Risk of Road Departure Crashes using Modeling and Reconstruction Methods
… Common roadside objects such as trees, poles, guardrails, embankments, culverts, and fences result account for roughly 46% of these fatalities. Efforts to reduce to injury risk and risk exposure in these crashes have been hampered by the difficulty in performing reconstructions. To address the …
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Mechanical characterization of aged recycled polymers and applications
… in practice).;Offset block modules for highway guardrail systems were manufactured with recycled ABS and discarded rubber tires. Reinforced recycled plastic shapes were evaluated as possible post and rail for highway guardrail systems. Channel, trapezoidal, and box sections, and flat sheets made …
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Injury Mechanisms in Roadside Motorcycle Collisions
… motorcyclists are fatally injured each year in guardrail crashes than passengers of any other vehicle, while only accounting for three percent of the vehicle fleet. Since motorcyclists account for a high percentage of these fatalities, the goal of zero deaths on the road cannot be achieved …
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Stochastic information in the assessment of climate change
… strategies that are compatible with so-called guardrails. Guardrails are limits to impacts of climate change or to climate change itself. Therefore, the TWA determines the "maneuvering space" humanity has, if certain impacts of climate change are to be avoided. Due to uncertainty it is not …
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Worker's Behavioral Adaptation to Safety Interventions and Technologies: Empirical Evidence and Theoretical Considerations Through The Case of Simulated Residential Roofing Task
… intervention— i.e., a fall-arrest system and a guardrail). The baseline demographic, psychographic, and cognitive measures combined with real-time tracking and wearable sensors provided an opportunity to track the worker's motions, localize his/her position, obtain real-time musculoskeletal …
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SAFEGUARDING AI SYSTEMS AGAINST UNEXPECTED INPUTS
… language models, we design a reasoning enabled guardrail to shield against unsafe multilingual prompts. Finally, we study challenging inputs arising from natural distribution shift in a clinical application: acne lesion classification.
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Radar Characteristics Study for the Development of Surrogate Roadside Objects
… of common roadside objects, metal guardrail, grass, and concrete divider, and the development of the required radar characteristics of surrogate objects. The whole process is divided into two steps. The rst step is to nd the proper methods to measure the radar properties of those …
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Determination of AASHTO Bridge Design Parameters through Field Evaluation of the Rt. 601 Bridge: A Bridge Utilizing Strongwell 36 in. Fiber-Reinforced Polymer Double Web Beams as the Main Load Carrying Members
… restraint at the supports, and contribution of guardrail stiffness. Secondary goals of this research were to quantify the effect of diaphragm removal on girder distribution factor, determine torsion and axial effects of the FRP girders, compare responses to multiple lane symmetrical loading to …
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Modelling pedestrians’ utilisation of crossing facilities, gap acceptance and crossing decision in urban area
… factors i.e. length of zebra crossing, guardrail and number of lanes that positively influenced the pedestrian utilisation rate of crossing facilities, four variables were found to have significant direct effect on the decision to use zebra crossings. The models developed for …
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Performance assessment of road barriers in Indiana
… of road barriers (concrete barriers, W-beam guardrails, and high-tension cable barriers) in Indiana using cross-sectional statistical analysis. The evaluation was comprised of three components: 1) the effect on the crash frequency (segment level), 2) the effect on the probabilities of …
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Predicting Occupant Injury with Vehicle-Based Injury Criteria in Roadside Crashes
… in crashes involving roadside hardware such as guardrail. These metrics attempt to derive the risk of injury based solely on the response of the vehicle during a collision event. The primary purpose of this research effort was to determine if real-world crash injury prediction could be improved …
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A Safety Analysis of Fatigue and Drowsy Driving in the State of Utah
… centerline rumble strips, cable median barrier, guardrail replacement, and drowsy driving highway signage. Drowsy driving countermeasures not yet implemented but which should be considered by the Utah Department of Transportation are transverse rumble strips, wider longitudinal pavement markings, …
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A chapel in southwest Virginia
… I always strained to see over the concrete guardrail, but the most I managed to Gather was the remains of a roof and that incredible brick smokestack. The image of the once functioning machine which ceases to work, and which is locked in some bygone era has intrigued me from an early age. …
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