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Development of fiber reinforced polymeric deck and cable system for cable-stayed bridges.

机译：用于斜拉桥的纤维增强聚合物桥面和电缆系统的开发。

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摘要

This research study addresses the effective use of fiber reinforced polymeric (FRP) materials in cable-stayed bridges with a primary focus on incorporating the light FRP materials in the deck and the cable system. As the main span length of cable-stayed bridges increases, several technical challenges become more dominant with traditional material. Such technical challenges include: large axial stress in the main girders, cable sag effect, and flutter instability, consequently limiting chances of extending the span length of future cable-stayed bridges with traditional materials. In order to remedy these issues, this study proposes FRP composites for the deck and cable system of cable-stayed bridges in combination with traditional materials.;This study seeks to answer the fundamental question: "How can FRP be used most effectively and most efficiently in the deck and cable system for cable-stayed bridges?" To use FRP most effectively in terms of static, dynamic and flutter performance, genetic algorithm (GA)-based optimizations were performed to optimize the distribution of FRP and concrete in the hybrid deck system and carbon fiber reinforced polymer (CFRP) volume ratio of each cable to maximize both static and flutter performances. To use FRP most efficiently, another GA optimization module was also developed to distribute the minimum amount of FRP in the deck and cable system to satisfy required performance limits. Implementing this GA optimization module in the traditional bridge design framework, a GA optimization-based bridge design framework was developed. To facilitate the optimization process, two numerical computer programs were developed: the analysis engine to evaluate the geometrical nonlinear static, modal, and flutter performances of cable-stayed bridges; and the optimization engine to conduct the search for optimal solutions. The analysis and optimization engines were combined into a single unit to perform the GA-based optimization process of cable-stayed bridges to make effective use of FRP materials and traditional materials that can extend the span length of cable-stayed bridges.
机译：这项研究致力于解决斜拉桥中纤维增强聚合物（FRP）材料的有效使用，其主要重点是在甲板和电缆系统中结合轻质FRP材料。随着斜拉桥的主跨长度的增加，传统材料面临着更多的技术挑战。这些技术挑战包括：主梁中的较大轴向应力，电缆垂度效应和颤动不稳定性，因此限制了使用传统材料扩展未来斜拉桥跨度的机会。为了解决这些问题，本研究提出了与传统材料相结合的斜拉桥桥面和电缆系统的FRP复合材料。该研究旨在回答以下基本问题：“如何最有效，最有效地使用FRP在斜拉桥的甲板和电缆系统中？”为了在静态，动态和颤振性能方面最有效地使用FRP，进行了基于遗传算法（GA）的优化，以优化FRP和混凝土在混合甲板系统中的分布以及每种纤维的碳纤维增强聚合物（CFRP）的体积比电缆以最大化静态和抖动性能。为了最有效地使用FRP，还开发了另一个GA优化模块，以在甲板和电缆系统中分配最少数量的FRP，以满足所需的性能限制。在传统的桥梁设计框架中实施此GA优化模块后，开发了基于GA优化的桥梁设计框架。为了促进优化过程，开发了两个数值计算机程序：分析引擎，用于评估斜拉桥的几何非线性静态，模态和颤振性能；以及用于搜索最佳解决方案的优化引擎。将分析和优化引擎组合到一个单元中，以执行基于遗传算法的斜拉桥优化过程，以有效利用FRP材料和传统材料来延长斜拉桥的跨度。

著录项

  • 作者

    Cai, Hongwei.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 443 p.
  • 总页数 443
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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