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Showing 1 to 15 of 15 for “"prestressing steel"”.
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Flexural Behavior of CFRP-Pretensioned Girders
… and strength. Beams prestressed with steel are susceptible to corrosion when subjected to environmental exposure. The corrosion of the prestressing steel reduces the beams’ load-carrying capacity and may result in catastrophic failures. Carbon fiber reinforced polymers (CFRP), as an …
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Behavior of FRP reinforced and partially prestressed concrete members under the effects of temperature gradients
… in addition to one beam post-tensioned with prestressing steel strand. The Leadline rods and the steel strand were prestressed with the same force but were located at different eccentricities from the cross-section centroid.
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Relaxation of prestressed steel used in construction of the confederation bridge
… investigation of the stress relaxation of the prestressing steel used in construction of the Confederation Bridge is undertaken. Relaxation is measured by monitoring the reduction in stress level in an elastically strained specimen and maintained at a constant extension. Two testing methods are …
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ASSESSING CORROSION DAMAGE IN PRESTRESSED CONCRETE WITH ACOUSTIC EMISSION
… is employed to assess the presence and rate of steel corrosion evolving inside prestressing steel reinforced small-scale concrete specimens. Test setup consists of grade 6,000 psi concrete blocks with dimensions 4.5 x 4.5 x 20 inch (114 x 114 x 508 mm); a 30 inch (760 mm) long - ½ inch (13 mm) …
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VHPC Material Characterization and Recommendations for the Buffalo Branch Bridge Rehabilitation
… leak down into the joints. This can lead to the prestressing steel inside the precast member and the transverse tie steel corroding. This necessitates the bridge being rehabilitated or replaced which shortens the life-span of the bridge system and negates the economical value it had to begin …
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Nonlinear time-dependent analysis of externally/internally prestressed reinforced concrete beams
… and shrinkage of concrete and relaxation of prestressing steel is presented. The procedure is capable of tracing the structural response of these structures through their service load history as well as throughout the elastic, inelastic, and ultimate load ranges. Sections can change …
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Biaxial Behavior of Ultra-High Performance Concrete and Untreated UHPC Waffle Slab Bridge Deck Design and Testing
… UHPC and using established material models. Prestressing steel was used as primary reinforcement in the transverse direction. Preliminary testing was used to evaluate three different placement scenarios, and results showed that fiber settling was a potential placement problem resulting in …
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Shear Strength Assessment of Corrosion-Damaged Prestressed Concrete Girders
… cover and exposure of the reinforcing and prestressing steel. This causes degradation in the load-carrying capacity of the bridge girders. Consequently, decisions need to be made on whether to replace, retrofit, or load post these bridges. Extensive research has focused on the flexural …
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Strengthening prestressed beams using parafil ropes as external tendons
… methods can be used, one of them is the external prestressing. Also, to avoid corrosion problem that faced this type of strengthening, Fibre Reinforced Plastics (FRP) can be used instead of steel tendons. Within the different types of FRP, Parafil rope was established to be well suited for …
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Condition assessment methods for prestressed concrete railway sleepers: feasibility for South African applications
… upon. Failure modes of concrete sleepers due to prestressing steel corrosion were unclear and further testing should be done to define what early-stage cracking displays to accurately predict the end of the useful life of a sleeper.
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Condition assessment methods for prestressed concrete railway sleepers: feasibility for South African applications
… upon. Failure modes of concrete sleepers due to prestressing steel corrosion were unclear and further testing should be done to define what early-stage cracking displays to accurately predict the end of the useful life of a sleeper.
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Recommendations for Longitudinal Post-Tensioning in Full-Depth Precast Concrete Bridge Deck Panels
… and shrinkage in concrete and relaxation of prestressing steel complicate bridge behavior, making the existing recommendations for post-tensioning in precast deck panels invalid for all bridges with differing girder types, sizes, spacings, and span lengths. Therefore, the development of …
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Quantification of prestressed concrete railway crosstie flexural response: Implications for mechanistic design
… proposed designs for both rail modes have fewer prestressing wires and a higher centroid of prestressing steel. In all cases the flexural capacities at the crosstie center and rail seat are better balanced from a structural reliability standpoint. The probabilistic method using structural …
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Developing a prism qualification test to ensure adequate splitting resistance in pretensioned concrete railroad ties
… of wire indentation on bond performance between prestressing steel and concrete when using different concrete mixtures. The bond between prestressing wires and concrete is crucial for transferring the stresses between the two materials in a pretensioned concrete member. Furthermore, bond can be …