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首页> 外文学位 >Field and laboratory performance of prestressed high performance concrete girders for Missouri bridge structures.
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Field and laboratory performance of prestressed high performance concrete girders for Missouri bridge structures.

机译：密苏里桥梁结构的预应力高性能混凝土梁的现场和实验室性能。

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摘要

The first fully high performance concrete (HPC) bridge A6130 was constructed in Missouri utilizing concrete with 56 day design strength of 70 MPa (10,152 psi) and 15.2 mm (0.6 in.) diameter prestressing strands. HPC materials for both girders and cast-in-place deck were studied for both mechanical and material properties.; The completed bridge was instrumented to measure temperature and strain variations. This was combined with deformation measurements to determine the bridge response to temperature changes, dead load, live load, creep, and shrinkage. Measured thermal behavior, strain behavior, prestress losses, camber and deflection were investigated by comparing to theoretical estimate at both early-age and later-age. Modified theoretical methods based on the test results were recommended. In addition, a live load test was completed for the bridge to investigate the load transfer, structure behavior due to live load, and the continuity level of the MoDOT interior bent detail.; MoDOT girder cross sections were investigated to identify the limitations of the sections relative to the use of high-strength concrete in simple span structures and to examine the feasibility of modified cross sections that can be used to take advantage of higher strength concrete that are currently available.; Construction related issues for HPC Bridges were documented to provide a reference for future HPC bridges. The summary, conclusions and recommendations were given for HPC highway bridges in Missouri and for general HPC structures in the United States considering design, fabrication, construction and the research program undertaken.
机译：在密苏里州建造了第一座全高性能混凝土（HPC）桥A6130，采用的是56天设计强度为70 MPa（10,152 psi）和直径为15.2 mm（0.6英寸）的混凝土。研究了用于梁和现浇甲板的HPC材料的机械和材料性能。完整的电桥用于测量温度和应变变化。结合变形测量来确定桥梁对温度变化，静载，活载，蠕变和收缩的响应。通过与早期和后期的理论估计值进行比较，对测得的热行为，应变行为，预应力损失，外倾角和挠度进行了研究。建议根据测试结果修改理论方法。此外，还完成了桥梁的活荷载测试，以研究荷载传递，由于活荷载引起的结构行为以及MoDOT内部弯曲细部的连续性水平。研究了MoDOT大梁的横截面，以识别相对于简单跨度结构中使用高强度混凝土而言，这些横截面的局限性，并检验可用于利用目前可用的高强度混凝土的改性横截面的可行性。;记录了与HPC桥有关的与施工有关的问题，以为将来的HPC桥提供参考。总结，结论和建议针对密苏里州的HPC公路桥梁以及美国的一般HPC结构，并考虑了设计，制造，施工和研究计划。

著录项

  • 作者

    Yang, Yumin.;

  • 作者单位

    University of Missouri - Rolla.;

  • 授予单位 University of Missouri - Rolla.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 415 p.
  • 总页数 415
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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