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Influence of bracing systems on the behavior of curved and skewed steel I-girder bridges during construction.

机译：在施工过程中，支撑系统对弯曲和偏斜的工字钢桥性能的影响。

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摘要

The construction of horizontally curved bridges with skewed supports requires careful consideration. These types of bridges exhibit three-dimensional response characteristics that are not commonly seen in straight bridges with normal supports. As a result of this behavior, engineers may face difficulties during the construction, when the components of the bridge do not fit together or the final geometry of the structure does not correspond to that intended by the designer. These complications can lead to problems that compromise the serviceability aspects of the bridge and in some cases, its structural integrity.;The three dimensional response that curved and skewed bridges exhibit is directly influenced by the bracing system used to configure the structure. In I-girder bridges, cross-frames are provided to integrate the structure, transforming the individual girders into a structural system that can support larger loads than when the girders work separately. In general, they facilitate the construction of the structure. However, they can also induce undesired collateral effects that can be a detriment to the performance of the system. These effects must be considered in the design of a curved and skewed bridge because, in some cases, they can modify substantially its response.;This research is focused on understanding how the bracing system affects the performance of curved and skewed I-girder bridges, as well as, the ability of the approximate analysis methods to capture the structural behavior. In this research, techniques that can be implemented in the creation of 2D-grid models are developed to overcome the limitations of this analysis method. In addition, efficient cross-frame arrangements that mitigate the collateral effects of skew are developed. These mitigation schemes reduce the undesired cross-frame forces and flange lateral bending stresses associated with the transverse stiffness of the structure, while ensuring that the bracing system still performs its intended functions.
机译：具有倾斜支撑的水平弯曲桥的构造需要仔细考虑。这些类型的桥具有三维响应特性，在带有普通支撑的直桥中不常见。由于这种行为，当桥梁的各个组件无法装配在一起或结构的最终几何形状与设计者的意图不符时，工程师可能会在施工过程中面临困难。这些复杂性可能导致损害桥梁使用性方面的问题，并在某些情况下损害桥梁的结构完整性。弯曲和倾斜的桥梁所表现出的三维响应直接受到用于配置结构的支撑系统的影响。在工字梁桥中，提供了跨框架以集成结构，从而将单个梁转换为结构系统，该系统可以承受比单独工作时更大的载荷。通常，它们有助于结构的构造。但是，它们也可能引起不良的附带影响，这可能会损害系统的性能。在某些情况下，在弯曲和倾斜的桥的设计中必须考虑这些影响，因为在某些情况下，它们会大大改变其响应。本研究着重于了解支撑系统如何影响弯曲和倾斜的I型梁桥的性能，以及近似分析方法捕获结构行为的能力。在这项研究中，开发了可用于创建2D网格模型的技术，以克服此分析方法的局限性。另外，开发了减轻偏斜的附带影响的有效的跨框架布置。这些缓解方案可减少与结构的横向刚度相关的不希望的横框架力和凸缘横向弯曲应力，同时确保支撑系统仍能执行其预期功能。

著录项

  • 作者

    Sanchez Grunauer, Telmo Andres.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 358 p.
  • 总页数 358
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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