Flexural test of precast high-strength reinforced concrete pile prestressed with unbonded bars arranged at the center of the cross-section

Mitsuyoshi Akiyama, Satoshi Abe, Nao Aoki, Motoyuki Suzuki

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    In this study, a prestressed reinforced concrete pile that uses high-strength material to increase the pile's flexural capacity was developed. The main structural characteristics of the developed pile include (1) the neutral axis is constantly near the centroidal axis of the pile, even if the longitudinal reinforcement yields due to a flexural moment, because the pile has a high axial compressive force that is induced by prestressed steel bars, and hence, the concrete in the compression region can contribute to increasing the flexural strength of the pile; and (2) the flexural strength of the pile increases because the high-strength concrete is confined by high-strength spirals and carbon-fiber sheets in combination with concrete infilling, and, together, these modifications provide a sufficiently high lateral-confinement pressure. The results of bending tests demonstrate that the proposed prestressed reinforced concrete pile with carbon-fiber sheets and concrete infilling had a much higher flexural capacity than a conventional precast concrete pile. In addition, an analytical approach is presented that can be used to obtain the relationship between the bending moment and the curvature of the proposed pile. Even if concrete bridge systems are constructed on strata that can experience soil liquefaction, such as very soft soil, bridge foundations that use the proposed piles could remain undamaged under the design seismic action.

    Original languageEnglish
    Pages (from-to)259-270
    Number of pages12
    JournalEngineering Structures
    Volume34
    DOIs
    Publication statusPublished - 2012 Jan

    Fingerprint

    Piles
    Reinforced concrete
    Concretes
    Prestressed concrete
    Bending strength
    Carbon fibers
    Soil liquefaction
    Precast concrete
    Concrete bridges
    Seismic design
    Bending tests
    Bending moments
    Reinforcement
    Compaction
    Soils
    Steel

    Keywords

    • Carbon-fiber sheet
    • Flexural strength
    • High-strength concrete
    • High-strength steel
    • Precast pile

    ASJC Scopus subject areas

    • Civil and Structural Engineering

    Cite this

    Flexural test of precast high-strength reinforced concrete pile prestressed with unbonded bars arranged at the center of the cross-section. / Akiyama, Mitsuyoshi; Abe, Satoshi; Aoki, Nao; Suzuki, Motoyuki.

    In: Engineering Structures, Vol. 34, 01.2012, p. 259-270.

    Research output: Contribution to journalArticle

    @article{6df8a26e73cf468db2d238827e49477a,
    title = "Flexural test of precast high-strength reinforced concrete pile prestressed with unbonded bars arranged at the center of the cross-section",
    abstract = "In this study, a prestressed reinforced concrete pile that uses high-strength material to increase the pile's flexural capacity was developed. The main structural characteristics of the developed pile include (1) the neutral axis is constantly near the centroidal axis of the pile, even if the longitudinal reinforcement yields due to a flexural moment, because the pile has a high axial compressive force that is induced by prestressed steel bars, and hence, the concrete in the compression region can contribute to increasing the flexural strength of the pile; and (2) the flexural strength of the pile increases because the high-strength concrete is confined by high-strength spirals and carbon-fiber sheets in combination with concrete infilling, and, together, these modifications provide a sufficiently high lateral-confinement pressure. The results of bending tests demonstrate that the proposed prestressed reinforced concrete pile with carbon-fiber sheets and concrete infilling had a much higher flexural capacity than a conventional precast concrete pile. In addition, an analytical approach is presented that can be used to obtain the relationship between the bending moment and the curvature of the proposed pile. Even if concrete bridge systems are constructed on strata that can experience soil liquefaction, such as very soft soil, bridge foundations that use the proposed piles could remain undamaged under the design seismic action.",
    keywords = "Carbon-fiber sheet, Flexural strength, High-strength concrete, High-strength steel, Precast pile",
    author = "Mitsuyoshi Akiyama and Satoshi Abe and Nao Aoki and Motoyuki Suzuki",
    year = "2012",
    month = "1",
    doi = "10.1016/j.engstruct.2011.09.007",
    language = "English",
    volume = "34",
    pages = "259--270",
    journal = "Engineering Structures",
    issn = "0141-0296",
    publisher = "Elsevier BV",

    }

    TY - JOUR

    T1 - Flexural test of precast high-strength reinforced concrete pile prestressed with unbonded bars arranged at the center of the cross-section

    AU - Akiyama, Mitsuyoshi

    AU - Abe, Satoshi

    AU - Aoki, Nao

    AU - Suzuki, Motoyuki

    PY - 2012/1

    Y1 - 2012/1

    N2 - In this study, a prestressed reinforced concrete pile that uses high-strength material to increase the pile's flexural capacity was developed. The main structural characteristics of the developed pile include (1) the neutral axis is constantly near the centroidal axis of the pile, even if the longitudinal reinforcement yields due to a flexural moment, because the pile has a high axial compressive force that is induced by prestressed steel bars, and hence, the concrete in the compression region can contribute to increasing the flexural strength of the pile; and (2) the flexural strength of the pile increases because the high-strength concrete is confined by high-strength spirals and carbon-fiber sheets in combination with concrete infilling, and, together, these modifications provide a sufficiently high lateral-confinement pressure. The results of bending tests demonstrate that the proposed prestressed reinforced concrete pile with carbon-fiber sheets and concrete infilling had a much higher flexural capacity than a conventional precast concrete pile. In addition, an analytical approach is presented that can be used to obtain the relationship between the bending moment and the curvature of the proposed pile. Even if concrete bridge systems are constructed on strata that can experience soil liquefaction, such as very soft soil, bridge foundations that use the proposed piles could remain undamaged under the design seismic action.

    AB - In this study, a prestressed reinforced concrete pile that uses high-strength material to increase the pile's flexural capacity was developed. The main structural characteristics of the developed pile include (1) the neutral axis is constantly near the centroidal axis of the pile, even if the longitudinal reinforcement yields due to a flexural moment, because the pile has a high axial compressive force that is induced by prestressed steel bars, and hence, the concrete in the compression region can contribute to increasing the flexural strength of the pile; and (2) the flexural strength of the pile increases because the high-strength concrete is confined by high-strength spirals and carbon-fiber sheets in combination with concrete infilling, and, together, these modifications provide a sufficiently high lateral-confinement pressure. The results of bending tests demonstrate that the proposed prestressed reinforced concrete pile with carbon-fiber sheets and concrete infilling had a much higher flexural capacity than a conventional precast concrete pile. In addition, an analytical approach is presented that can be used to obtain the relationship between the bending moment and the curvature of the proposed pile. Even if concrete bridge systems are constructed on strata that can experience soil liquefaction, such as very soft soil, bridge foundations that use the proposed piles could remain undamaged under the design seismic action.

    KW - Carbon-fiber sheet

    KW - Flexural strength

    KW - High-strength concrete

    KW - High-strength steel

    KW - Precast pile

    UR - http://www.scopus.com/inward/record.url?scp=80155156948&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=80155156948&partnerID=8YFLogxK

    U2 - 10.1016/j.engstruct.2011.09.007

    DO - 10.1016/j.engstruct.2011.09.007

    M3 - Article

    VL - 34

    SP - 259

    EP - 270

    JO - Engineering Structures

    JF - Engineering Structures

    SN - 0141-0296

    ER -