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    Numerical study on bending response of precast segmental concrete beams externally prestressed with FRP tendons

    91441.pdf (2.054Mb)
    Access Status
    Open access
    Authors
    Tran, D.T.
    Pham, Thong
    Hao, Hong
    Chen, Wensu
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tran, D.T. and Pham, T.M. and Hao, H. and Chen, W. 2021. Numerical study on bending response of precast segmental concrete beams externally prestressed with FRP tendons. Engineering Structures. 241: ARTN 112423.
    Source Title
    Engineering Structures
    DOI
    10.1016/j.engstruct.2021.112423
    ISSN
    0141-0296
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FL180100196
    URI
    http://hdl.handle.net/20.500.11937/91617
    Collection
    • Curtin Research Publications
    Abstract

    This study numerically investigates the bending response of dry key-jointed precast segmental concrete girders/beams (PSCBs) prestressed with external fiber reinforced polymer (FRP) tendons by using commercial finite element analysis (FEA) software Abaqus/CAE. The experimentally-validated model was used to conduct an intensive parametric analysis with a focus on the second-order effect. There has not been a similar numerical study of PSCBs with external FRP tendons in the published literature yet. The results showed that due to the rectilinear rigid-body bending shape, the behavior of PSCBs with external tendons was similar to that with internal tendons only if placing the deviators next to the opening joints. The second-order effect on the beam's behavior and the harping effect on the tendon stress at deviators became more obvious when the deviators were located away from the opening joints. Both the second-order and harping effect were proportionate to the beam's displacement. Therefore, using a high reinforcing index (ω) or a low span-to-depth ratio (L/dp) could mitigate the second-order and harping effect at the ultimate stage because the ultimate displacement of the beam decreased when increasing ω or reducing L/dp. Commonly-used CFRP tendons (Young's modulus Ep = 145 GPa) were found to be the optimum to replace steel tendons in PSCBs with external tendons because they offered the PSCBs similar strength and ductility compared to steel tendons. The use of high-modulus CFRP tendons (e.g. Ep = 200 GPa) improved the stiffness and strength of PSCBs but greatly reduced the beam's ductility. Lastly, the analytical analyses showed that the existing models yielded unconservative estimations of the effective depth (dpu) and stress (fpu) of external FRP tendons at the ultimate stage in PSCBs.

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