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Non-linear analysis of concrete beams prestressed and post-tensioned with carbon fiber reinforced polymer (CFRP) bars.

机译：碳纤维增强聚合物（CFRP）筋预应力和后张混凝土梁的非线性分析。

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摘要

The deterioration of concrete bridges has been a major concern for structural engineers especially with regard to deterioration caused by the corrosion of steel reinforcement. One of the promising avenues to overcome this problem is to take advantage of the non corrosive characteristic of the Fiber Reinforced Polymer (FRP) bars in reinforcing and/or prestressing concrete bridges. In addition FRP bars have high specific strength, i.e., strength to weight ratio, when compared to conventional steel. Using FRP bars in a combined system of internal prestressing and external post-tensioning provides a potential solution to increase the service life of concrete bridges. However, due to the difference in the mechanical properties between FRP tendons and steel, the flexural behavior of beams prestressed and post-tensioned with internally bonded and externally unbonded carbon fiber reinforced polymer (CFRP) tendons is different when compared with the behavior of beams prestressed with conventional steel bars and/or tendons. Also, as these beams can be post-tensioned with unbonded tendons the deflection of the whole system becomes a controlling parameter in the analysis.; An analytical model has been developed to examine the behavior of beams prestressed and post-tensioned with CFRP tendons. First, finite element analysis has been carried out to calibrate the tension stiffening characteristic of concrete in order to take into consideration the difference in the bond behavior between CFRP tendons and steel for beams prestressed with bonded tendons. The calibrated tension stiffening is used in the analytical model for the proper modeling of the cross-section curvatures and deflection calculations. Three analytical approaches that account for the tension stiffening of concrete in indirect approaches were also applied to examine the change in the post-tensioning force and were compared with the analytical model. These approaches use the ACI 440.4R-04 committee recommendation, ISIS equation and CEIB-FIP code approach to evaluate the effective moment of inertia used in beam deflection.; Furthermore, results from two experimental programs were used to validate the proposed analysis. The first experimental program tested a full scale Double-Tee beam (DT-beam) prestressed and post-tensioned with CFRP tendons, and was conducted at Construction Technology Laboratories, Skokie, Illinois. This beam is a replica of the beams used in the superstructure of the "Bridge Street Bridge" constructed over the Rouge River in Southfield, Michigan, USA. The second experimental program was conducted at Lawrence Technological University, Southfield, Michigan, USA for box beams prestressed with internally bonded and externally unbonded CFRP tendons to examine the behavior of these beams.
机译：混凝土桥梁的劣化一直是结构工程师关注的主要问题，尤其是在钢筋加固腐蚀引起的劣化方面。克服该问题的有前途的途径之一是在增强和/或预应力混凝土桥梁中利用纤维增强聚合物（FRP）钢筋的无腐蚀特性。另外，与常规钢相比，FRP棒具有高的比强度，即强度/重量比。在内部预应力和外部后张应力的组合系统中使用FRP筋可提供潜在的解决方案，以延长混凝土桥梁的使用寿命。但是，由于FRP筋和钢之间的机械性能不同，与内部预应力和预应力梁的性能相比，预应力和后张内，外未粘结碳纤维增强聚合物（CFRP）筋的梁的挠曲性能有所不同。与传统的钢筋和/或腱。而且，由于这些梁可以用未粘结的筋进行后张，因此整个系统的挠度成为分析中的控制参数。已经开发出一种分析模型来检查预应力和后张CFRP筋束的性能。首先，已经进行了有限元分析以校准混凝土的抗拉刚度特性，以考虑到CFRP筋与用于预应力筋的梁的钢之间的粘结性能差异。在分析模型中使用校准后的张力刚度对横截面曲率和挠度计算进行正确建模。还采用了三种间接分析方法来解释混凝土的拉伸刚度，以检查后张拉力的变化，并与分析模型进行了比较。这些方法使用ACI 440.4R-04委员会建议，ISIS方程和CEIB-FIP代码方法来评估光束偏转中使用的有效惯性矩。此外，两个实验程序的结果被用来验证所提出的分析。第一个实验程序测试了用CFRP筋预应力和后张的全尺寸双T型梁（DT梁），该程序在伊利诺伊州斯科基市的建筑技术实验室进行。该光束是在美国密歇根州绍斯菲尔德的Rouge河上建造的“桥梁街桥”上部结构中使用的光束的复制品。第二个实验程序是在美国密歇根州南菲尔德的劳伦斯技术大学进行的，对内部和外部未粘结的CFRP筋预应力的箱形梁进行了研究。

著录项

  • 作者

    Abd El Aziz, Mohamad Fathy.;

  • 作者单位

    University of Windsor (Canada).;

  • 授予单位 University of Windsor (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 137 p.
  • 总页数 137
  • 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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