• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Detailing for compression in reinforced concrete wall boundary elements: Experiments, simulations, and design recommendations.
【24h】

Detailing for compression in reinforced concrete wall boundary elements: Experiments, simulations, and design recommendations.

机译：钢筋混凝土墙边界元素中的压缩详图：实验，模拟和设计建议。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Reinforced concrete structural walls are one of the most common lateral force-resisting systems in buildings located in high seismicity regions. Walled structures are expected to provide significant strength and ductility under cyclic earthquake loading. In part, this expectation is based on the assumption that current design approaches suppress compression failure of the boundary element. However, compression failures observed following recent earthquakes in Chile (2010) and New Zealand (2011), suggest that the behavior of reinforced concrete walls may not meet expectation and further study is required.;As part of a larger effort initiated by the National Earthquake Hazards Reduction Program (NEHRP) at the National Institute of Standards and Technology (NIST), a research program was developed to understand and improve the seismic behavior of concrete walls. This portion of that larger research program focuses on evaluation of, prediction of, and recommendations to improve boundary elements in structural walls. The research is divided into three phases. The first phase uses experimental research methods to evaluate the impact of salient study parameters on vertically loaded, large-scale rectangular reinforced concrete prism members that simulate the boundary element of a special concrete wall. This experimental program explored the effects of detailing of both transverse and longitudinal reinforcement and loading protocol on the compressive confined strength and strain capacity of boundary elements.;In the second phase of research, these experimental results were combined with prior tests to evaluate commonly used confined concrete constitutive models and current detailing requirements in ACI 318-14. The test results indicate that rectangular reinforced concrete prism members designed to meet the minimum ACI 318-14 detailing requirements for special boundary elements exhibit little to no significant increase in compressive strength or deformation capacity as compared to boundary elements that do not meet those minimum requirements. By looking at the full data set, a hierarchy of detailing parameters was developed. In order of importance, the following detailing parameters are shown to increase both strength and strain capacity: (i) ratio of transverse reinforcement spacing to longitudinal bar diameter of at most 4.0, (ii) full development of transverse reinforcement legs used to restrain longitudinal reinforcement, (iii) buckling restraint for all longitudinal reinforcement, and (iv) increased transverse reinforcement ratio. In addition, the results indicate that commonly used confined concrete constitutive models over-predict the strength and deformation capacity of ACI 318-14 compliant boundary elements. A new formulation for this model is proposed and validated to more accurately predict compressive performance. In addition, the new formulation is also shown to provide accurate prediction of wall performance when it is implemented into modern nonlinear analysis techniques.;The third phase of the research used the results to investigate possible improvements to ACI 318-14 boundary element detailing requirements. Three performance-based levels of detailing were studied, each providing an estimated expected peak stress and strain capacity; the applicability of commonly used confined concrete constitutive models was also investigated for each detail level. These detailing levels are intended to provide the design engineer with guidance in selecting proper boundary element detailing to meet specific performance needs.
机译：钢筋混凝土结构墙是地震高发地区建筑物中最常见的横向抗力系统之一。在周期性地震荷载作用下，预计围墙结构将提供显着的强度和延展性。在某种程度上，这种期望是基于这样的假设，即当前的设计方法可以抑制边界元素的压缩失效。然而，智利（2010）和新西兰（2011）近期地震后观察到的压缩破坏表明，钢筋混凝土墙的性能可能不符合预期，需要进一步研究。;作为国家地震发起的一项更大努力的一部分美国国家标准与技术研究院（NIST）的减灾计划（NEHRP）是一项研究计划，旨在了解和改善混凝土墙的抗震性能。较大的研究计划的这一部分着重于评估，预测和建议，以改善结构墙中的边界元素。研究分为三个阶段。第一阶段使用实验研究方法来评估显着研究参数对垂直加载的大型矩形钢筋混凝土棱柱构件的影响，这些构件模拟了特殊混凝土墙的边界元素。该实验程序探索了横向和纵向钢筋和荷载方案的详细信息对边界单元的压缩极限强度和应变能力的影响。在研究的第二阶段，将这些实验结果与先前的测试相结合，以评估常用的极限约束具体的本构模型和ACI 318-14中的当前详细要求。测试结果表明，与不满足这些最低要求的边界元件相比，设计为满足特殊ACI 318-14最低详细要求的矩形钢筋混凝土棱镜构件的抗压强度或变形能力几乎没有或没有显着提高。通过查看完整的数据集，开发了详细参数的层次结构。从重要性的角度出发，显示了以下详细参数，以增加强度和应变能力：（i）横向钢筋间距与纵向钢筋直径的比例最大为4.0，（ii）充分发展了用于限制纵向钢筋的横向钢筋支腿，（iii）所有纵向钢筋的屈曲约束，以及（iv）增加的横向钢筋比率。此外，结果表明，常用的承压混凝土本构模型过高地预测了符合ACI 318-14的边界单元的强度和变形能力。提出并验证了该模型的新公式，以更准确地预测压缩性能。此外，新配方还显示出当将其应用到现代非线性分析技术中时，可以提供对墙体性能的准确预测。研究的第三阶段使用结果研究了对ACI 318-14边界元素细化要求的可能改进。研究了三个基于性能的细化级别，每个级别提供了估计的预期峰值应力和应变能力。对于每个细节级别，还研究了常用承压混凝土本构模型的适用性。这些细化级别旨在为设计工程师提供指导，以选择适当的边界元素细化以满足特定的性能需求。

著录项

  • 作者

    Welt, Travis Steven.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 567 p.
  • 总页数 567
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号