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 15 of 15 for “"bridge approach"”.
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Optimization of Bridge Approach Slab
… its own practice for design and construction of Bridge Approach Slab (BAS). The objective of this thesis is to explore the usage of alternate innovative structural solution for Missouri Department of Transportation (MoDOT), simple to implement in the field and to reduce the cost of construction …
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Structural behavior of integral abutment bridge approach slabs
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Field monitoring of integral abutment bridge approach slabs
Integral abutment bridges (IABs) eliminate the joints between the deck and abutments and hence have become more prevalent in the U.S. due to lower maintenance costs and longer service life. Cracking of approach slabs immediately adjacent to IABs, which requires maintenance, repair, and even …
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Bridge approach slab analysis and design incorporating elastic soil support
… equations necessary for the analysis of finite bridge approach slabs (BAS) on elastic soil support is reported in this thesis. Results are compared for moments and shear forces governing the design for a wide range of values of soil elastic modulus ranging from dense sand to very loose sand. …
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Track model for predicting dynamic responses of railroad bridge approaches
… on the development of a novel train-track-bridge model that can analytically tackle the difficult problem of a railway track transition zone and effectively simulate the dynamic response of a bridge approach subjected to moving train loads. The scope of the research encompassed statistical …
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Analyses and modeling of track transition site responses from instrumented bridge approaches
"Railroad bridge approaches, which connect open track to bridge structures, commonly experience recurring defects, such as broken superstructure components, excessive deformation, and ballast degradation that may require frequent maintenance. Such deformations or simply referred to as ""bumps at …
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Novel monitoring system to diagnose rail track foundation problems
… through a two phase installation exercise at the bridge approach site in FAST (Facility for Accelerated Service Testing) at Transportation Technology Centre Inc (TTCI), Pueblo, Colorado, USA. Since there are virtually no settlements at the stiff, sandy bridge approach site, the sensors are …
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Assessment of structural concrete approach slab cracking at integral abutment bridges
The elimination of expansion joints between the bridge deck and approach slabs in an integral abutment bridge (IAB) decreases the potential for water and salt damage to the bridge superstructure and bearings. However, the lack of expansion joints in an IAB can lead to complex interactions between …
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Investigations of Bromus tectorum: restoration strategies and interactions with arbuscular mycorrhizal fungi
… and facilitation. This tested an "ecological bridge" approach in which early successional species replace invasive species and allow succession to proceed. There were no seed treatment differences amongst late successional plant species establishment. The native plant species included may have …
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Group Selection in Semiparametric and Nonparametric Accelerated Failure Time Models
… in these models. Motivated by the group bridge approach for variable selection in a multiple linear regression model, we consider group selection in a semiparametric accelerated failure time (AFT) model using Stute's weighted least squares and a group bridge penalty. This method is able …
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Integrated approach for simulation and prediction of railway track dynamic responses
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Mitigation of differential movements at railroad bridge transition zones
… a rapid change in track structure, such as a bridge or crossing. These locations are prone to differential movement and require frequent resurfacing to maintain an acceptable track geometry for both passing freight and high-speed passenger trains. In an effort to reduce the frequency of track …
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Integrated computational and experimental framework for the assessment of railroad ballast life-cycle behavior
… Furthermore, full validation of the framework approach was accomplished through field testing efforts; ballast settlement trends computed from the full-scale track numerical simulations were compared with the actual ballast settlements measured in the Transportation Technology Center (TTC) High …
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Impact of mobile cranes on short span bridges
… of the impact of mobile crane on short span bridges. Short span bridges span between 5 and 40m are very common in South Africa. A finite element model representing the interaction of a mobile crane with a bridge has been developed using Adina finite element software. Bridges have been modeled …
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Integral bridge abutment and backfill behaviour
Integral bridges do not contain the bearings or expansion joints found in conventional bridges. Interaction between the abutments and backfill due to thermal movements of the bridge deck leads to the accumulation of soil strain — known as strain ratcheting — which results in increased lateral earth …