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 37 for “"Bridge piers"”.
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Local scour at bridge piers
Local scour at cylindrical bridge piers in both uniform and non-uniform cohesionless sediments was investigated experimentally. The aim of the study was to improve understanding of local scour around bridge piers with sediment transport. Three empirical functions which relate the equilibrium depth …
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HEAVY TRUCK COLLISION WITH BRIDGE PIERS
<p>Based on bridge failure data compiled by the New York State Department of Transportation, collision, both caused by vessels and vehicles, is the second leading cause of bridge failures after hydraulic. The current AASHTO-LRFD (2017) specification recommends designing a bridge pier vulnerable to …
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Scour at bridge piers and abutments
… on scour. The formulae are applied to two known bridge failures and their accuracy in those particular situations examined. The usual methods of scour prevention and protection are discussed.
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Ice Action Database for the Confederation Bridge Piers
… be predicted accurately. During the design of piers of the Confederation Bridge, various design parameters including ice velocity, ice thickness, rubble height, ride up and ridge keel properties were considered in the assessment of ice action. To study the relationship between design models and …
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Modelling local scour around bridge piers using TELEMAC
Scour at bridge crossings is a major cause of bridge failure. There are several different types of scour such as general scour, constriction scour and local scour. One of the most serious types is local scour which occurs as a result of vortex formation around bridge piers and abutments (Hoffmans & …
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Physical modeling of local scour around complex bridge piers
Local scour around bridge foundations has been recognized as one of the main causes of bridge failures. The objective of this study is to investigate the relationships among field, laboratory, and numerical data for the purpose of improving scour prediction methods for complex bridge piers. In this …
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Evaluation of the Interaction Between Flow Turbulence and Corrosive Material Transport Around Bridge Piers
… influence of corrosion on turbulent flow around bridge piers and its implications for structural integrity and environmental safety. By examining the interaction between flow turbulence and corrosion-induced particles, the research highlights their effects on vortex formation, sediment transport, …
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Evaluation of the Interaction Between Flow Turbulence and Corrosive Material Transport Around Bridge Piers
… influence of corrosion on turbulent flow around bridge piers and its implications for structural integrity and environmental safety. By examining the interaction between flow turbulence and corrosion-induced particles, the research highlights their effects on vortex formation, sediment transport, …
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Introducing, Examining and Optimising Flow Diversion Structure as an Innovative Countermeasure against Local Scour around Bridge Piers
… have indicated that local scour around bridge piers and abutments is a common cause of waterway bridge failures with around 60% of bridge collapses due to this phenomenon. To reduce local scour, a new flow-altering device referred to as a flow diversion structure (FDS) has been …
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Numerical modelling of local scour in rivers using fluent 6.2
… Man-made obstacles to the stream flow such as bridge piers and abutments and other hydraulic structures alter flow patterns causing local scouring and deposition. Excessive scour undermines the foundations of bridges and other fluvial structures which may ultimately cause their collapse. …
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FOOTING FIXITY OF BRIDGE PIER WITH END-BEARING PILE FOUNDATION
… large axial loaded compression members, like bridge piers, are under lateral load impacts, the rotation at the base of the pier may cause a significant effect on the lateral deflection of the pier. However, traditionally the computation of slenderness ratio and the structure deflection due to …
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Bridge Pier Surface Defect Detection Based on Improved YOLOV9
… detection methodology specifically designed for bridge piers, which integrates state-of-the-art image enhancement algorithms with sophisticated target detection frameworks. This hybrid approach effectively addresses some of the inherent limitations observed in existing deep learning-based defect …
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Shear capacity of circular concrete sections
… concrete sections such as those often used as bridge piers is not well defined. A requirement for design guidance on this topic has been recognised by key BSI Committees and this dissertation is intended to help shape and inform future UK design practice.This dissertation provides a state of …
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Numerical modelling of reinforced concrete bridge pier under artificially generated earthquake time-histories
… They are then used in the analysis of RC bridge piers under the AGETH. Several techniques including Fourier analysis, normalised cumulative spectrum, energy dissipation, damage index as well as probability applications are applied to quantify the structural response and damage. Based on …
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Durability of fiber-reinforced composite wrap system for the rehabilitation of concrete structures
… employed for rehabilitation of concrete bridge piers. Standard concrete cylinders (4&inches; x 8&inches; in dimensions) wrapped with 1 layer of glass fabric embedded in an epoxy resin matrix were used to simulate the field situation. Wet lay-up method was used to wrap the concrete …
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Assessment of FRP-confined concrete : understanding behavior and issues in nondestructive evaluation using radar
… and retrofitting of concrete columns and bridge piers has urged the development of' an effective non-destructive evaluation (NDE) methodology. Radar technologies have shown great potential for assessing the structural and material integrity of FRP-confined concrete systems. In developing …
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Inelastic web crushing performance limits of high-strength-concrete structural walls
The construction of the three new toll bridges in California has highlighted the application of the hollow rectangular bridge piers with highly-reinforced boundary elements and the connecting walls. However, current conservative design approaches result in massive cross sections that can lead to …
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Means and Methods Analysis of a Cast-In-Place Balanced Cantilever Segmental Bridge: The Wilson Creek Bridge Case Study
… exist in the construction industry to erect bridge superstructures. In planning and execution of the complex construction operations the effects of the chosen erection method need to be considered to achieve a safe and economical process. Failures of bridges under construction have underlined …
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Using the movability number to model local clear-water scour in rivers
… is associated with a considerable number of bridge failures worldwide. It occurs at bridge piers and abutments as a result of interactions between complex flow features and the channel bed. The number of factors involved in the interactions makes it difficult to predict. A lot of research has …
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