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首页> 外文学位 >Flexural models for reinforced concrete beams with CFRP strengthening, under monotonic and cyclic loadings.
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Flexural models for reinforced concrete beams with CFRP strengthening, under monotonic and cyclic loadings.

机译：在单调和循环荷载下采用CFRP加固的钢筋混凝土梁的挠性模型。

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摘要

The flexural behavior of reinforced concrete beams strengthened with carbon fiber reinforced polymer (CFRP) is the focus of this research. The flexural behavior discussed in this research is about two main serviceability properties of the beams, the flexural crack width and deflection, within service load level. For monotonic loading condition, a universal analytical model is developed, which considers nonlinearity in both concrete compressive constitutive relation and concrete tensile softening effect. The model proposed in this study is applicable to plain concrete, reinforced concrete beams and reinforced concrete beams strengthened with FRP. The direct analytical results from the model are moment-curvature relations. Based on the moment-curvature relation, the further results of load-crack mouth opening displacement (CMOD) and load-deflection relations can be obtained. To look at the fatigue behavior of reinforced concrete beams, an analytical model for service level cyclic load is proposed. The cyclic-dependent concrete properties, such as compressive strength, fracture modulus and tensile modulus, are considered in this model. The cyclic-dependent rigidity relation and deflection versus number of cycles relation are given from the analytical model. To validate the analytical models for both monotonic load and cyclic load, experimental works are performed. The experimental results are compared with the model predicted results and good correlations are found. The model for monotonic load gives results for both CMOD and deflection predictions. The analytical model for cyclic load also gives results of flexural behaviors of the beams, which explain the phenomenon observed from test data, such as the flexural rigidity remains stable after the drop from early loading cycles.
机译：碳纤维增强聚合物（CFRP）加固的钢筋混凝土梁的抗弯性能是本研究的重点。在这项研究中讨论的弯曲行为是关于梁在使用载荷水平内的两个主要使用寿命特性，即挠曲裂缝宽度和挠度。对于单调加载条件，建立了一个通用分析模型，该模型同时考虑了混凝土压缩本构关系和混凝土拉伸软化效果的非线性。本研究提出的模型适用于普通混凝土，钢筋混凝土梁和玻璃钢加固的钢筋混凝土梁。该模型的直接分析结果是弯矩曲率关系。基于弯矩-曲率关系，可以获得载荷裂纹张口位移（CMOD）和载荷-挠度关系的进一步结果。为了研究钢筋混凝土梁的疲劳性能，提出了服务水平循环荷载分析模型。该模型考虑了与循环有关的混凝土性能，例如抗压强度，断裂模量和拉伸模量。由分析模型给出了与周期有关的刚度关系和挠度与周期数的关系。为了验证单调载荷和循环载荷的分析模型，进行了实验工作。将实验结果与模型预测结果进行了比较，发现了良好的相关性。单调载荷模型给出了CMOD和挠度预测的结果。循环载荷的分析模型还给出了梁的挠曲行为的结果，这些结果解释了从测试数据中观察到的现象，例如从早期载荷循环下降后，挠曲刚度保持稳定。

著录项

  • 作者

    Wang, Dong.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 123 p.
  • 总页数 123
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

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