Reducing Cambers And Prestress Losses By Including Fully Tensioned Top Prestressing Strands and Mild Reinforcing Steel

Jayaseelan, Hema; Russell, Bruce W.

doi:10.15554/pcij64.3-05

Cited by 2 publications

(2 citation statements)

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“…Jayaseelan et al 8 observed that using fully tensioned top strands and mild reinforcing steel in the precompression zones of prestressed concrete bridge girders reduced the camber by 72%. Williams et al 9 found that the AASHTO LRFD 2017 and the ACI 318-14 provided conservative estimates for the shear strengths of precast, pretensioned concrete girders. Yan et al 9 revealed that the number of strands and the corrosion length were critical indicators of the degradation of the bending capacity of precast, pretensioned girders.…”

Section: Introductionmentioning

confidence: 99%

“…Williams et al 9 found that the AASHTO LRFD 2017 and the ACI 318-14 provided conservative estimates for the shear strengths of precast, pretensioned concrete girders. Yan et al 9 revealed that the number of strands and the corrosion length were critical indicators of the degradation of the bending capacity of precast, pretensioned girders. Alirezaei et al 10 investigated three end-region reinforcement methods to reduce the crack width and stress in steel girders.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the bending performance of a precast, pretensioned high-strength concrete I-girder with pretensioned double broken strands

Lu,

Zheng,

Chen

et al. 2024

Preprint

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Precast, pretensioned concrete girders are extensively used in bridge engineering to prevent damage to concrete girders, such as the loss of prestress and the corrosion of strands. Existing studies of the mechanical performance and failure characteristics of bridge girders had shortcomings, resulting in potential safety hazards. This study conducted a full-scale model experiment and theoretical analysis of the bending performance of a 35-m long precast, pretensioned concrete I-girder with pretensioned double broken strands. The cracks and bending damage were investigated. The results showed that the maximum vertical displacement of the composite girder was much lower than the required standard value, with a crack factor and bearing capacity factor of 1.31 and 1.54, respectively. The bending stiffness of the composite girder decreased by 70%. Many cracks occurred in the concrete, resulting in excess stress of the steel bars and prestressed strands. The crack width during loading was much smaller than the theoretical one in the Specifications for Highway Reinforced Concrete Prestressed Concrete Bridge Culverts(JTG 3362 − 2018). Therefore, the girder exhibited optimum bending stiffness, sufficient crack resistance, acceptable ultimate bending capacity, and ductile failure performance. The mechanical behavior and failure mechanism during loading were investigated. This study provides recommendations for the design, maintenance, and damage assessment of this bridge type to improve the service lives of bridges.

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Section: Introductionmentioning

confidence: 99%