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Performance of T-shaped reinforced concrete structural walls under multi-directional loading.

机译：T形钢筋混凝土结构墙在多向荷载下的性能。

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摘要

Rectangular reinforced concrete structural wall segments are often combined into nonrectangular, flanged shapes. This increases the stiffness and capacity of the wall relative to that of the individual segments, and it leads to interaction between the loading directions, with the capacity in each direction dependent upon the demand in the orthogonal direction. To better understand the behavior of these systems and the adequacy of the detailing for large seismic demands, it is important to investigate their response associated with the effects of multi-directional loading. Additionally, appropriate design tools are needed so that engineers can determine the response of these walls in general design use with reasonable accuracy and computational effort. Two non-rectangular reinforced concrete wall specimens were tested to failure and a simplified modeling approach was developed to facilitate the use of performance-based engineering by practicing engineers. Both of the nonrectangular walls tested represented half-scale subassemblages from the wall system in a six-story prototype building. Modifications to the wall detailing between the specimens were incorporated in order to study the effects of lateral distribution and lap splicing of longitudinal reinforcement and increasing the amount of shear reinforcement and the dimensions of the confined region beyond current requirements. Additionally, the first subassemblage incorporated four stories of the six-story prototype and the second incorporated only two stories in order to investigate the effects of boundary condition simulation on the test results.;To facilitate the development of performance-based engineering, a simplified modeling approach was developed for use by structural engineers to predict the load-deformation response of structural systems incorporating walls and to relate local strain levels, which are relatively easily predicted, to meaningful damage levels and the performance levels being established for use with performance-based engineering. The predicted load-displacement response is separated into the components of deformation due to flexure, shear, and strain penetration to give further indication of the types of damage that are expected, such as flexural cracks or web shear cracks. To investigate the robustness of this model relative to the prediction of the force-deformation response of wall systems, the results of the model were compared to the response of several specimens tested by other researchers.
机译：矩形钢筋混凝土结构墙段通常组合成非矩形的法兰形状。相对于各个部分，这增加了壁的刚度和容量，并且导致了加载方向之间的相互作用，每个方向上的容量取决于正交方向上的需求。为了更好地了解这些系统的性能以及满足大地震需求的详细信息的重要性，重要的是研究与多向荷载作用相关的响应。此外，还需要适当的设计工具，以便工程师可以合理的精度和计算量确定常规设计中这些墙的响应。测试了两个非矩形钢筋混凝土墙样本的破坏性，并开发了简化的建模方法，以促进实践工程师使用基于性能的工程。所测试的两个非矩形墙都代表了六层原型建筑中墙系统的半比例子组件。为了研究横向钢筋和纵向钢筋搭接的影响以及增加抗剪钢筋的数量和受限区域的尺寸超出当前要求，对标本之间的墙细节进行了修改。此外，第一个子组件合并了六层原型的四个故事，第二个子组件仅合并了两个故事，以研究边界条件模拟对测试结果的影响。为了简化基于性能的工程的开发，简化了建模开发了一种方法，供结构工程师用来预测包含墙的结构系统的荷载-变形响应，并将相对容易预测的局部应变水平与有意义的损伤水平和性能水平建立起来，以用于基于性能的工程。预测的载荷-位移响应被分解为由于弯曲，剪切和应变渗透而引起的变形分量，以进一步表明预期的破坏类型，例如弯曲裂纹或腹板剪切裂纹。为了研究此模型相对于墙体力-变形响应的预测的鲁棒性，将模型的结果与其他研究人员测试的几个样本的响应进行了比较。

著录项

  • 作者

    Brueggen, Beth Louise.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 498 p.
  • 总页数 498
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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