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 20 for “"Load Rating"”.
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Improved Load Distribution for Load Rating of Low-Fill Box Structures
… at shallow depths. Periodic evaluation of their load carrying capacities is required for load rating of the culvert by determining a rating factor (RF) or truck tonnage of a HS truck. The rating factor is defined as the capacity of the structure minus the dead load demand, and then divided by the …
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Live Load Testing of Appalachia, Va Concrete Arch Bridges for Load Rating Recommendation
… Appalachia, Virginia were selected for live load testing by Virginia Department of Transportation (VDOT). Both bridges have supported an increasing amount of extreme coal truck traffic throughout their service life and are essential to the efficient transport of coal in the region. Because of …
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Global Dynamic Characterization and Load Rating of Bridge Structures Utilizing Economical Dynamic Excitation Devices
… parameters of the in-service bridge are used in load rating. Direct use of the modal properties of a bridge for load rating is unprecedented, and a relatively simple method to use measured modal flexibility to help determine live load demand is developed herein. The bridge load ratings calculated …
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Load Testing Deteriorated Spans of the Hampton Roads Bridge-Tunnel for Load Rating Recommendations
… Virginia coast has taken its toll on the main load carrying girders. Concrete spalling has exposed prestressing strands within the girders allowing corrosion to spread. Some of the more damaged girders have prestressing strands that have completely severed due to the extensive corrosion. The …
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Rational load rating of deck-girder bridges with girder end shear cracks in reverse orientation
… of this cracking and creates BRIDGE (Bridge Rating of Inclined Damage at Girder Ends), an Excel-based software to determine the load rating of a user specified bridge exhibiting reverse diagonal shear cracking at the girder supports. A user-interface is created which allows a user to create a …
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Comparative Study of LRFR and LFR Methods of Rating for Missouri Prestressed Bridges
Bridge load rating is a crucial aspect of bridge evaluation and management, providing essential information regarding a bridge's capacity to safely accommodate traffic loads. For public safety, it is a crucial process for both new and existing bridges by establishing the weight restriction on heavy …
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Methods for Evaluation of the Remaining Strength in Steel Bridge Beams with Section Losses due to Corrosion Damage
… near the bearing locations and measured for load, vertical displacement, and web strain behavior. The strain was measured using a digital image correlation (DIC) system to create a digital strain field at equal loading and beam displacement intervals during testing. The data recorded during …
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Service response and evaluation of prestressed concrete bridges through load testing
… protocol using experimental data to obtain the load rating of prestressed concrete bridges in Load and Resistance Factor Rating (LRFR) format. The proposed experimental evaluation approach will enable bridge owners to estimate, isolate and remove the unreliable parameters' contribution from a …
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Decision making for bridge stock management
… were built according to codes with design loads that are now inconsistent with today’s traffic demands. Currently, transportation agencies do not know how to respond to transit applications on their bridges. This thesis focuses on the legal issues entailed by overweight/oversize load …
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SuperLoad Crossing of Millard Avenue Bridges Over Duck Creek and CSX Railroad
A series of superloads crossed the Millard Avenue Bridges which span over Duck Creek and the CSX railroad. These bridges are located in Toledo and Oregon, Ohio, on the route from the Port of Toledo to a nearby oil refinery. The bridge over Duck Creek is a three span straight slab-on- steel girder …
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Development of a Magnetic Field Sensor System for Nondestructive Evaluation of Reinforcing Steel in Prestressed Concrete Bridge Members
… of the condition of the prestressing strands for load rating. This thesis presents a magnetic inspection system to measure main magnetic flux (MMF) and magnetic leakage flux (MFL) signals, to evaluate the condition of prestressing stands. A proof-of-concept has been established using a prototype …
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Structural Condition Assessment Of Prestressed Concrete Transit Guideways
… share common design details, geometries, and loading conditions. The original analysis is based on certain simplifying assumptions such as rigid behavior over supports and simplified tendon/concrete/steel plate interaction. The current objective is to conduct a representative study for a more …
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Long-Term Associations Between Subjective Ratings of Wellness and Exertion and Parameters of Training Load in Elite Soccer Over Two Seasons
… season; 20 players from the 2014/15). Subjective ratings of muscle soreness (MS) and fatigue (Fat) were collected prior to training sessions two days before a match. Sessional load (rating of perceived exertion x session duration) (sRPE) was measured following each session. GPS metrics of total …
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Comparative Study of LRFR and LFR Methods of Rating for Missouri Steel Bridges
Bridge load rating is a method used to check on the ability of bridges to carry a given live load. Bridge rating is important to ensuring public safety in that it helps the concerned agencies to enforce weight restriction on heavy vehicles to safeguard the structures from failure. Before the bridge …
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Multi-hazard performance of bridge timber piles retrofitted with fiber reinforced polymer composites
… and empirical data. Since only gravity loads were considered in their original design, many timber pile bridges are deficient by modern standards. Further exacerbating this problem is their age and the susceptibility to degradation. Despite these issues, timber bridges in general are …
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Risk-based bridge asset management
… the structural risk of railway bridges by integrating once again structural reliability and exposure. Specifically, for the evaluation of the former for aging masonry arch railway bridges, which constitute a significant portion of the Italian railway infrastructure stock, a simplified approach …
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Decision theory process for making a mitigation decision on harmonic resonance in power systems
… The model uses a fixed capacitor based on full load rating as this represents the worst case. In Stage 2, Utility Theory is used as the decision criterion to select the most desirable capacitor size. In Stage 3, the mitigation index is applied to assess if mitigation is needed or not for the …
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Comparative study of LRFR and LFR methods of rating for Missouri concrete bridges
Bridge load rating is a critical component of evaluating and managing bridge infrastructure, offering crucial insights into a bridge's capacity to safely handle traffic loads. The process is fundamental for both new and existing bridges, establishing weight restrictions on vehicles to prevent …
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Structural assessment of bridges using monitoring data
… bridge assets (i.e., how much additional live load can be safely placed on a bridge). In addition, bridge assessment remains a key asset management challenge in that there has been a consistent mismatch between the calculated load rating and the actual capacity of bridges. These findings form …
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Bridge maintenance to enhance corrosion resistance and performance of steel girder bridges
<p>The integrity and efficiency of any national highway system relies on the condition of the various components. Bridges are fundamental elements of a highway system, representing an important investment and a strategic link that facilitates the transport of persons and goods. The cost to …