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Showing 1 to 20 of 22 for “"Prestressed concrete girders"”.
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Shear Strength Assessment of Corrosion-Damaged Prestressed Concrete Girders
Corrosion is a concern in old prestressed concrete bridges, especially bridges built in marine environments. Corrosion induces cracks in the concrete superstructure which accelerates the deterioration rate and can result in a complete loss of the concrete cover and exposure of the reinforcing and …
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Nontraditional Limitations on the Shear Capacity of Prestressed Concrete Girders
It was also determined that the requirement for longitudinal tension reinforcement near the support included in the 4th edition of the AASHTO LRFD Bridge Design Specifications may underestimate the demand on longitudinal tension reinforcement. Alternatively an equilibrium based approach is …
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The design procedures of continuous bridges with precast, prestressed concrete girders
Digitized by Kansas Correctional Industries
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The design procedures of continuous bridges with precast, prestressed concrete girders
Digitized by Kansas Correctional Industries
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Shear Strength Assessment of Corrosion-Damaged Prestressed Concrete Girders Repaired With CFRP
… in the end regions of the beams, failure of the girders will likely be in shear, which is a sudden failure mode and not the preferred limit state. Therefore, it is beneficial to study repair practices and their advantages, as repairs are often more cost-effective than building entirely new …
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Continuity of bridges composed of simple-span precast prestressed concrete girders made continuous
Bridges composed of simple-span, precast, prestressed concrete girders made continuous via cast-in-place decks and diaphragms are continuous only for live loads and superimposed dead loads. The continuity diaphragms often crack due to time dependent effects in the girders. These cracks not only …
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Repair of damaged end regions of prestressed concrete girders using fiber reinforced polymer composite materials
… efficient repair and retrofit material for many concrete infrastructure applications. FRP can be applied to concrete using many techniques, but primarily as either externally bonded laminates or near-surface mounted (NSM) bars or plates. These repair methods have been shown to be effective when …
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Evaluation of Repairs Conducted on Full-Scale, Non-Conforming/Defective Prestressed Concrete Girders (PCI BT-54)
… and full-scale experimental testing of BT-54 girders with simulated nonconformance issues. Results showed that top flange repairs consistently exceeded original girder strength, while bottom flange repairs were generally effective except in bearing zones and transfer regions, where …
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Prediction of Time-Dependent Stresses and Deflections in Prestressed, Concrete Girders: From Start of Fabrication to End of Service Life
… accurate prediction of the camber in precast, prestressed, concrete girders. Large differences in the camber between adjacent girders lead to significant construction difficulties that often have financial and/or legal ramifications. Many factors affect the time-dependent deflections of these …
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Acoustic Emission Techniques and Cyclic Load Testing for Integrity Evaluation of Self-Compacting Normal and Self-Compacting Lightweight Prestressed Concrete Girders
… (AE) techniques when used on self-compacting prestressed lightweight and normal weight concrete girders. The current investigation examines data obtained from the four point loading tests of six full scale T-girders, and applies the current criteria from these methodologies to evaluate the …
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Optimization and behavior of high-performance concrete in structural applications
… selection for the production of high-performance concrete and to examine the behavior of these materials in structural applications. The results of the research have been submitted for publication in five conference proceedings and technical journals. The first paper investigates a particle …
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Recommendations for Longitudinal Post-Tensioning in Full-Depth Precast Concrete Bridge Deck Panels
Full-depth precast concrete panels offer an efficient alternative to traditional cast-in-place concrete for replacement or new construction of bridge decks. Research has shown that longitudinal post-tensioning helps keep the precast bridge deck in compression and avoid problems such as leaking, …
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Using Maturity to Predict Girder Camber
… was to determine if differential camber of prestressed concrete girders could be reduced by accurate prediction of initial camber at release of prestress. Maturity at prestress transfer was used to calculate modulus of elasticity for predicting camber at release. The research consists of a …
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Shear Behavior of Reinforced Concrete Beams and Prestressed Concrete Beams
… the last decades, developments in high-strength concrete materials are rapid, but codes of practice still limits the concrete compressive strength in design of concrete structures due to a lack of experimental research data. As an effort to overcome the limitation to the use of high strength …
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Repair of Impact-Damaged Prestressed Bridge Girders Using Strand Splices and Fabric Reinforced Cementitious Matrix
… thesis investigates the repair of impact-damaged prestressed concrete bridge girders with strand splices and fabric-reinforced cementitious matrix systems, specifically for repair of structural damage to the underside of an overpass bridge girder due to an overheight vehicle collision. Collision …
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Load Testing Deteriorated Spans of the Hampton Roads Bridge-Tunnel for Load Rating Recommendations
… Hampton Roads Bridge-Tunnel is one of the oldest prestressed concrete structures in the United States. The 3.5 mile long twin structure includes the world's first underwater tunnel between two man-made islands. Throughout its 60 years in service, the harsh environment along the Virginia coast has …
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The Influence of the Recommended LRFD Guidelines for the Seismic Design of Highway Bridges on Virginia Bridges
… two existing bridges. The first bridge has prestressed concrete girders and is located in the Richmond area. The second bridge has steel girders and is located in the Bristol area. The analysis procedure for both bridges is similar. First the material and section properties were calculated. …
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Anchorage Zone Design for Pretensioned Bulb-Tee Bridge Girders in Virginia
Precast/Prestressed concrete girders are commonly used in bridge construction in the United States. The application and diffusion of the prestress force in a pretensioned girder causes a vertical tension force to develop near the end of the beam. Field surveys of the beam ends of pretensioned …
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Carbon Fiber Reinforced Polymer Repairs of Impact-Damaged Prestressed I-Girders
… the ultimate flexural capacity of impact-damaged prestressed concrete girders. The number of severed prestressing strands and the amount of CFRP repair material applied are varied to create a large repair matrix. The ultimate moment capacity was calculated using the program XTRACT. Capacities were …
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Experimental Investigations of Residual Strength and Repaired Strength of Corrosion Damaged Prestressed Bridge Beams
… durability of infrastructure components, such as prestressed concrete bridge beams, can be significantly affected by long-term deterioration associated with corrosion. Corrosion is a major concern for bridges in Virginia, due to the frequent use of deicing salts during the winter, as well as the …
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