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首页> 外文期刊>Magazine of Concrete Research >Behaviour of double prestress system in prestressed concrete girders
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Behaviour of double prestress system in prestressed concrete girders

机译：预应力混凝土梁中双预应力系统的行为

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摘要

Prestress generally refers to the compressive prestress that is introduced by a compressive force beforehand to prevent tensile stress on the lower fibre of the bending member, and is often used in concrete girders. In girders with a smaller height compared to span length, compressive stress, which has a harmful impact on structural behaviour, is applied excessively to the girder's upper edge, limiting the reduction in girder height of the prestressed concrete girder. In this study, a prestress system integrating a tendon and two bars to support the compressive force in the girder's side ends was devised to offset the compressive force generated in the girder as a result of the introduction of prestress. To manage the jacking force of this system, formulae are proposed by theoretically clarifying the behaviour manifested during jacking in relation to the friction coefficient of the tendon and bars. A 10-m long rectangle-shaped girder is fabricated to check the friction coefficient of the bar and to verify the moment prestress method using the proposed double prestress system. Applicability to real structures is validated by measuring the behaviour manifested during the jacking of 35-m long real bridge girders.
机译：预应力通常是指预先由压缩力引入的压缩预应力，以防止在弯曲构件的下部纤维上产生拉应力，该预应力通常用于混凝土大梁中。在与跨度长度相比高度较小的大梁中，对结构行为产生有害影响的压缩应力会过度施加到大梁的上边缘，从而限制了预应力混凝土小梁高度的降低。在这项研究中，设计了一个预应力系统，该系统集成了一根筋和两个杆以支撑大梁侧端的压力，以抵消由于引入预应力而在大梁中产生的压力。为了管理该系统的顶升力，通过理论上澄清顶升过程中与钢筋和钢筋的摩擦系数有关的行为，提出了公式。制造了一个10米长的矩形梁，以检查钢筋的摩擦系数，并使用所提出的双预应力系统验证弯矩预应力方法。通过测量顶起35米长的实桥大梁时表现出来的性能，可以验证其对实结构的适用性。

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  • 来源
    《Magazine of Concrete Research》 |2013年第14期|855-864|共10页
  • 作者

    Choong Eon Kim; Jae Kwan Kim; Jin Kook Kim;

  • 作者单位

    Department of Civil and Environmental Engineering, Seoul National University, Gwanak-gu, Seoul, Korea;

    Department of Civil and Environmental Engineering, Seoul National University, Gwanak-gu, Seoul, Korea;

    Energy Infrastructure Research Department,Steel Structure Research Division, Research Institute of Industrial Science and Technology, Yeonsu-Gu, Incheon, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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