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Assessment of long-term deformations of the Confederation Bridge.

机译:评估联邦大桥的长期变形。

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摘要

Connecting the Canadian provinces of Prince Edward Island and New Brunswick, the Confederation Bridge is the world's longest pre-stressed concrete box girder bridge built over ice laden waters. With a total length of 12.9 km and a 100-year design life, the design of the Confederation Bridge was not covered by any code or standard that existed at that time. A structural monitoring program was initiated at the time of construction of the bridge and has been ongoing since its opening in 1997. This monitoring program is being carried out to measure the behaviour and performance of the bridge under various conditions and to obtain unique field performance information to assist engineers in the long-term management of the bridge.;The research reported in this thesis focused on the long-term trend of strain and deformation due to creep and shrinkage of the concrete and other phenomena which typically occur in prestressed concrete structures. Creep in concrete is described as a dimensional change in the material under the influence of sustained loading. In addition, whether subjected to load or not, concrete contracts on drying, and undergoes shrinkage. In general, time-dependent deformations of concrete, such as those caused by creep and shrinkage, may affect the serviceability, durability and stability of the structure.;Many studies have been completed to measure the effect of creep and shrinkage on concrete, but few of those studies have had data from a real structure that is exposed to all environmental elements, and not only those applied in a lab. In addition, laboratory studies are generally conducted on small specimen often less than 1 metre in length. The section of the Confederation Bridge which maybe considered the specimen for this study is 500 m long. Ten years of data was available for this project which is significant because records of actual long-term deformations of long span bridges are rare and the opportunity to calibrate design techniques with actual data is valuable in the design of other bridges.;Long-term deformations from the bridge are currently being measured by mechanical displacement transducers and vibrating wire strain gauges that are installed in the concrete at selected sections in the bridge. Data collected by this structural monitoring program was processed and analyzed to determine the trend of strain and deformation that has occurred over its first 10 years of service life principally due to creep and shrinkage of the concrete. These field values were then compared with predicted values and algorithms proposed to predict future trends for the long-term deformation of the bridge. The project was also used to develop and refine methodologies for long-term structural health monitoring.
机译:联邦大桥连接加拿大爱德华王子岛省和新不伦瑞克省,是世界上最长的预应力混凝土箱梁桥,建在积冰的水域上。联邦大桥的总长度为12.9公里,设计寿命为100年,当时没有任何法规或标准涵盖该大桥的设计。自桥梁建造之初就启动了结构监测程序,自1997年开放以来一直在进行。该监测程序旨在测量桥梁在各种条件下的行为和性能,并获得独特的现场性能信息。协助工程师进行桥梁的长期管理。本论文的研究重点在于混凝土的蠕变和收缩引起的应变和变形的长期趋势以及其他预应力混凝土结构中常见的现象。混凝土的蠕变被描述为材料在持续荷载作用下的尺寸变化。另外,无论是否受到载荷,混凝土在干燥时都会收缩并收缩。通常,混凝土随时间变化的变形(例如蠕变和收缩引起的变形)可能会影响结构的使用寿命,耐久性和稳定性。;已经完成了许多研究来测量蠕变和收缩对混凝土的影响,但很少有研究这些研究中的数据来自暴露于所有环境因素的真实结构,而不仅仅是在实验室中应用的那些数据。此外,实验室研究通常是对长度小于1米的小样本进行的。邦联大桥的这一部分可能被认为是本研究的样本,其长度为500 m。该项目可使用十年的数据,这很重要,因为大跨度桥梁的实际长期变形记录很少,并且利用实际数据校准设计技术的机会在其他桥梁的设计中也很有价值。目前,正在使用机械位移传感器和振动线应变仪来测量来自桥梁的应力,这些传感器安装在桥梁中选定部分的混凝土中。处理并分析了该结构监测程序收集的数据,以确定在其使用寿命的最初10年中发生的应变和变形趋势,主要原因是混凝土的蠕变和收缩。然后将这些场值与预测值进行比较,并提出了用于预测桥梁长期变形的未来趋势的算法。该项目还用于开发和完善用于长期结构健康监测的方法。

著录项

  • 作者

    Butcher, Adele Marie.;

  • 作者单位

    Dalhousie University (Canada).;

  • 授予单位 Dalhousie University (Canada).;
  • 学科 Engineering Civil.;Engineering Materials Science.
  • 学位 M.A.Sc.
  • 年度 2009
  • 页码 283 p.
  • 总页数 283
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:37:40

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