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首页> 外文学位 >Behavior, design and construction of horizontally curved composite steel box girder bridges.
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Behavior, design and construction of horizontally curved composite steel box girder bridges.

机译：水平弯曲复合钢箱梁桥的性能，设计与施工。

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摘要

Horizontally curved girder bridges have been used considerably in recent years in highly congested urban areas. However, although significant research on physical testing and advanced analysis has been underway for the past decade, the practical employment of many recommendations has not been achieved by the engineering community nor have standards reflecting this work been brought into practice.; The design process of curved composite bridges involves tracking the stresses and the potential failure change in the girders during erection, construction and service loading stages. For structural safety and serviceability, the designer estimates the stresses induced within the bridge and assure that they do not exceed the applicable specified limit state as required in bridge design standards. However, the designer may be concerned about the level of approximation that is used in his estimate or even the applicability of the underlying theory. To answer this question and provide the designer with more insight into the behavior of the curved bridges, the field testing during construction and service loading of a curved bridge located near Baltimore, Maryland is re-examined here using linear elastic three-dimensional finite element modeling. Comparisons are made between the finite element results and the measured results.; The level of safety or reliability that would be available during the erection and the construction processes of horizontally curved girder bridges represents another major concern for the designer. A three span continuous curved box girder bridge in Houston, Texas is used in this study as an example reflecting current detailing and fabricating practice and it is chosen for a detailed evaluation of the structural safety/reliability during the erection and construction process. This task involves simulating the girder erection and concrete slab placement sequence of the bridge using comprehensive nonlinear three dimensional finite element modeling.; Finally, to facilitate the finite element modeling effort for use by a designer, ANSYS Parametric Design Language (APDL) capabilities are used here to develop an analysis/design tool for "Bath-Tub" style curved steel girder bridges. This tool is then used to evaluate the effects of several important design variables on the response and behavior of the girders during the construction phase. This study demonstrates the ability of finite element modeling to assess the stiffness, serviceability performance, buckling behavior and ultimate strength of curved bridges during construction and it is a major step towards a performance based approach to design for stability.
机译：近年来，在高度拥挤的城市地区已经大量使用了水平弯曲的梁桥。但是，尽管过去十年来一直在进行大量有关物理测试和高级分析的研究，但工程界尚未实际采用许多建议，也没有将反映这项工作的标准付诸实践。弯曲复合材料桥梁的设计过程包括在安装，施工和服务荷载阶段跟踪梁中的应力和潜在的破坏变化。为了结构安全性和可维修性，设计人员估算桥梁内部产生的应力，并确保它们不超过桥梁设计标准所要求的适用规定极限状态。但是，设计人员可能会担心其估算中使用的近似水平，甚至担心基础理论的适用性。为了回答这个问题并为设计人员提供更多关于弯曲桥梁行为的见解，此处使用线性弹性三维有限元建模重新检查了位于马里兰州巴尔的摩附近的弯曲桥梁的建造和服务负荷期间的现场测试。在有限元结果和测量结果之间进行比较。在水平弯曲的梁桥的架设和施工过程中可获得的安全性或可靠性水平是设计人员的另一个主要关注点。本研究以德克萨斯州休斯敦的三跨连续弯箱形箱梁桥为例，以反映当前的细部设计和制造实践，并选择其在安装和施工过程中对结构安全性/可靠性进行详细评估。该任务涉及使用全面的非线性三维有限元建模来模拟桥梁的梁架设和混凝土板的放置顺序。最后，为了简化设计人员使用的有限元建模工作，此处使用ANSYS参数化设计语言（APDL）功能来开发用于“浴盆”式弯曲钢梁桥的分析/设计工具。然后，该工具用于评估几个重要的设计变量在施工阶段对大梁的响应和行为的影响。这项研究证明了有限元建模能够评估弯曲桥梁在施工过程中的刚度，使用性能，屈曲行为和极限强度，这是迈向基于性能的稳定性设计方法的重要一步。

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  • 作者

    Whyib Aldoori, Muayad.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 269 p.
  • 总页数 269
  • 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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