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首页> 外文期刊>PCI Journal >Transverse panel-to-panel connections for full-depth precast concrete bridge deck panels on continuous steel girder bridges: Part 2, time-dependent analysis
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Transverse panel-to-panel connections for full-depth precast concrete bridge deck panels on continuous steel girder bridges: Part 2, time-dependent analysis

机译：连续钢梁桥上全深度预制混凝土桥面板的横向板对板连接：第2部分，时变分析

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摘要

Precast, posttensioned concrete deck panels can be used for rapid replacement of bridge decks; however, the appropriate initial stress to avoid cracking and leaking in bridge deck panels remains a question. This paper uses the age-adjusted effective modulus method to account for creep, shrinkage, and stress redistribution in the composite system. A parametric study was conducted on simple- and continuous-span bridge configurations with steel girders using the maximum tensile stress limit from the companion paper (maximum tensile stress of 3.0 f'_c~(1/2) psi [0.25 f'_c~(1/2) MPa]). For simple-span bridges, an initial precompression of 200 to 300 psi (1.38 to 2.07 MPa) was adequate. In continuous three-span bridges, the recommended stress was typically achieved with 200 to 750 psi (5.17 MPa) of initial prestress. Two-span systems were most critical; some bridges required close to 1000 psi (6.90 MPa) of initial prestress. For continuous-span bridges, the initial compressive stress required increased substantially for accelerated construction schedules.
机译：预制，后张预应力混凝土面板可用于快速更换桥面板；然而，避免桥面板面板开裂和泄漏的适当初始应力仍然是一个问题。本文使用年龄调整后的有效模量方法来说明复合系统中的蠕变，收缩和应力重新分布。使用附带的最大张应力极限（最大张应力为3.0 f'_c〜（1/2）psi [0.25 f'_c〜（ 1/2）MPa]）。对于单跨桥梁，初始预压缩为200至300 psi（1.38至2.07 MPa）就足够了。在连续的三跨桥中，通常在200至750 psi（5.17 MPa）的初始预应力下即可达到推荐的应力。两跨系统是最关键的。一些桥梁需要接近1000 psi（6.90 MPa）的初始预应力。对于连续跨度的桥梁，为加快施工进度，所需的初始压应力已大大增加。

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  • 来源
    《PCI Journal》 |2014年第2期|78-95|共18页
  • 作者

    Amey V. Bapat; Matthew K. Swenty; Carin L. Roberts-Wollmann; Thomas E. Cousins;

  • 作者单位

    Department of Civil and Environmental Engi-neering at Virginia Polytechnic Institute and State University in Blacksburg, Va;

    Department of Civil and Environmental Engineering at the Virginia Military Institute in Lexington,Va;

    Depart-ment of Civil and Environmental Engineering at Virginia Polytech-nic Institute and State University;

    Department of Civil and Environmental Engi-neering at Virginia Polytechnic Institute and State University;

  • 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
  • 中图分类
  • 关键词

    Bridge; creep; deck; panel; posttensioning; shrinkage; steel beam; time dependence;

    机译：桥;蠕变;甲板;面板;后张收缩钢梁;时间依赖性;

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