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首页> 外文学位 >Seismic retrofit and repair of reinforced concrete bridge columns using shape memory alloy spirals.
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Seismic retrofit and repair of reinforced concrete bridge columns using shape memory alloy spirals.

机译：使用形状记忆合金螺旋线对钢筋混凝土桥柱进行抗震改造和修复。

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摘要

This research focuses on examining the use of shape memory alloy (SMA) spirals in the seismic retrofitting and repair of reinforced concrete (RC) bridge columns. The thermally triggered recovery stress of prestrained SMA spirals is utilized to apply large active confinement pressure at the column’s plastic hinge zone to enhance the flexural ductility of vulnerable columns and limit their post-earthquake damage. Although research has proven that concrete active confinement is a more superior technique to passive confinement, its field application using conventional materials is hindered due to several complications related to the method of application. This research focuses on investigating the new concrete active confinement technique using SMA spirals numerically and experimentally, which is rapid, robust and simple. The research work comprises of: 1) Performing numerical analysis on RC columns retrofitted using SMA spirals (active confinement) and Fiber Reinforced Polymer (FRP) wraps (passive confinement) to examine the superiority of the suggested new confinement technique over current confinement techniques, 2) Investigating experimentally the thermo-mechanical behavior of NiTiNb SMA which is used for this research, 3) Testing concrete cylinders wrapped with SMA spirals and Glass-FRP (GFRP) wraps, 4) Conducting quasistatic lateral cyclic tests on four 1/3-scale RC columns retrofitted with SMA spirals and GFRP wraps, 5) Conducting quasi-static lateral cyclic tests on two severely damaged columns that were repaired using SMA spirals as an emergency repair technique, 6) Utilizing the experimental results of the tested columns to develop and validate numerical models for RC columns retrofitted with SMA spirals, and 7) Utilizing the validated models to conduct a comprehensive parametric study on columns retrofitted with SMA spirals. The results of this experimental and numerical work clearly illustrate that using thermally prestressed SMA spirals to apply external active confinement pressure on concrete columns is an effective, simple, robust, and rapid approach to improve the performance of RC bridge columns.
机译：这项研究的重点是检查形状记忆合金（SMA）螺旋在钢筋混凝土（RC）桥柱的抗震改造和修复中的用途。预应力SMA螺旋的热触发恢复应力用于在柱子的塑料铰链区施加较大的活动约束压力，以增强易损柱子的挠曲延性并限制其对震后的破坏。尽管研究已经证明混凝土主动约束比被动约束更优越，但由于与应用方法相关的一些复杂性，阻碍了其在常规材料中的现场应用。这项研究的重点是通过数值和实验方法研究使用SMA螺旋的新型混凝土主动约束技术，该技术快速，可靠且简单。研究工作包括：1）对使用SMA螺旋（主动约束）和纤维增强聚合物（FRP）包裹材料（被动约束）改型的RC柱进行数值分析，以检验建议的新约束技术相对于当前约束技术的优越性，2 ）实验研究用于该研究的NiTiNb SMA的热机械行为，3）测试包裹有SMA螺旋和Glass-FRP（GFRP）包裹的混凝土圆柱，4）在四个1/3比例上进行准静态横向循环测试装有SMA螺旋和GFRP包裹的RC柱，5）对使用SMA螺旋作为紧急修复技术修复的两个严重损坏的柱进行准静态侧向循环测试，6）利用测试柱的实验结果进行开发和验证SMA螺旋加固的RC柱的数值模型，以及7）利用验证的模型对colu进行全面的参数研究mns改型为SMA螺旋。实验和数值研究的结果清楚地表明，使用热预应力SMA螺旋在混凝土柱上施加外部主动约束压力是提高RC桥柱性能的有效，简单，可靠且快速的方法。

著录项

  • 作者

    Shin, Moochul.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Engineering Civil.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 274 p.
  • 总页数 274
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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