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首页> 外文学位 >Effects of prestressing on the structural behavior of stress-ribbon bridges and design of Popolopen Creek footbridge as a stress-ribbon bridge.
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Effects of prestressing on the structural behavior of stress-ribbon bridges and design of Popolopen Creek footbridge as a stress-ribbon bridge.

机译：预应力对应力带桥结构行为的影响以及作为应力带桥的Popolopen Creek人行桥的设计。

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摘要

This report serves three purposes: (1) to determine the best suitable alternative and the practicality of a stress-ribbon, (2) to learn about the design of stress-ribbon bridges, and (3) understand the effects of prestressing on stress-ribbon bridges. This report describes the design requirements, architectural and structural design, and static analysis and structural behavior of the bridge.;A stress-ribbon bridge was chosen as the best bridge design for Popolopen Creek after evaluating six other alternative designs. The alternatives included trusses, arches, and cable supported structures. Factors that attributed to a stress-ribbon's appeal include its minimalist appearance, case of construction, low cost of construction, low environmental impact, and minimal long-term maintenance.;The stress ribbon structure being proposed will be a total length of 336 feet between abutments and will accommodate pedestrians or a maintenance vehicle. The stress ribbon will be an assembly of 21 precast concrete segments suspended on bearing cables and prestressed with post-tensioning tendons. The bridge was designed in accordance to AASHTO guide specifications for pedestrian bridges along with the appropriate steel and concrete codes from RISC and ACI respectively and complies with all requirements stated.;SAP2000 structural software was used to statically analyze a model of the proposed structure and to investigate the effects of prestressing the deck. The model verified the functionality of the bridge in terms of deflection and load carrying capacity. Prestressing of the deck also shows increased rigidity of the deck and reduction in maximum deflection but resulted in increases to external lateral forces. Varying of tendon eccentricity and prestressing forces also revealed other behavior trends in stress ribbon bridges.
机译：该报告具有三个目的：（1）确定应力带的最佳替代方案和实用性；（2）了解应力带桥的设计；（3）了解预应力对应力的影响-丝带桥。该报告描述了桥梁的设计要求，建筑和结构设计以及静力分析和结构特性。应力波桥在评估了其他六种替代设计后被选为Popolopen Creek的最佳桥梁设计。替代方案包括桁架，拱和电缆支撑结构。应力带的吸引力归因于其外观极简，结构紧凑，造价低，对环境的影响小以及对长期维护的要求最小;拟议的应力带结构的总长度为336英尺基台，可容纳行人或维修车辆。应力带将是由21个预制混凝土节段组成的组件，这些节段悬挂在轴承电缆上并用后张预应力筋预应力。桥梁是根据AASHTO的人行天桥指南规范以及RISC和ACI的相应钢和混凝土规范进行设计的，并且符合所述的所有要求。SAP2000结构软件用于静态分析所提议结构的模型，并研究预应力甲板的影响。该模型在挠度和承载能力方面验证了桥梁的功能。甲板的预应力还显示了甲板的刚度增加和最大挠度的减小，但导致了外部横向力的增加。腱偏心率和预应力的变化也揭示了应力带桥的其他行为趋势。

著录项

  • 作者

    Choi, Jeffrey.;

  • 作者单位

    The Cooper Union for the Advancement of Science and Art.;

  • 授予单位 The Cooper Union for the Advancement of Science and Art.;
  • 学科 Engineering Civil.
  • 学位 M.E.
  • 年度 2010
  • 页码 69 p.
  • 总页数 69
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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