Mechanism of Concrete Confinement by Rectilinear Ties

地震多发区的许多结构都是用钢筋混凝土建造的。在抗震设计中，钢筋混凝土构件的合理性能在很大程度上取决于结构的延性。关键部位混凝土的约束对结构延性性能的实现起着重要作用。在这项研究中，将使用分析模型和实验室样品的实验来研究直线约束的基本机理。提出一种合理的方法来确定围护结构所需的钢筋数量和配置，从而进行经济安全的结构设计。本研究的结果将为美国混凝土协会、ACI318和SEAOC等美国设计规范的约束条款的修改和建议提供依据。首席调查员非常有资格进行这项研究，该机构提供了极好的支持设施。建议为这个为期两年的完整项目的第一年颁发奖项。

Many structures in earthquake prone areas are constructed using reinforced concrete. In seismically resistant design, proper behavior of the reinforced concrete structural elements depends a great deal on the ductility of the structure. Confinement of concrete in critical locations plays a significant part in achieving ductile behavior of structures. In this research, basic mechanisms of confinement by rectilinear ties will be investigated using analytical models and experiments with laboratory specimens. A rational method will be developed to determine the required amount and configuration of confining steel which will result in economical and safe design of structures. Results from this research are expected to provide the basis for modifications and recommendation in the confinement provisions of various U.S. design codes such as American Concrete Institute ACI 318 and SEAOC. The Principal Investigator is highly qualified to conduct the research and the institution provides excellent support facilities. An award is recommended for the first year of this two-year complete project.