Impoving Development Characteristics of Reinforcing Bars

改善钢筋的开发特性

• 批准号: 9021066
• 负责人: David Darwin
• 金额: $ 18.35万
• 依托单位: University of Kansas Center for Research Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-15 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9021066&HistoricalAwards=false
• 关键词: Impoving; Development; Characteristics; Reinforcing; Bars

The current ASTM requirements for reinforcing bar geometry were established over 40 years ago and are now incorporated in four ASTM specifications covering reinforcing bars. The proposed research will apply the latest in analysis and testing techniques to evaluate currently used and potential new rib geometries, and to develop recommendations aimed at obtaining optimum reinforcing bar development characteristics. The program will include a basic study of the interactions at the steel-concrete interface, apply nonlinear finite element analyses to evaluate different rib geometries, test existing patterns and prototype bars, design and produce reinforcing bars with new patterns, and evaluate the bars in full-size structural members. Structural considerations will include the effects of the interactions of closely spaced reinforcement, the behavior of splices as well as straight development, cyclic loading, fatigue and fracture, and high strength concrete. In addition the effects of epoxy coating on bond strength and modifications to epoxy coatings, such as the addition of grit, will be considered.

目前ASTM对钢筋几何形状的要求是 成立于40多年前，现已纳入四个ASTM 钢筋规格。 拟议研究 将应用最新的分析和测试技术， 评估当前使用的和潜在的新肋骨几何形状，并 制定旨在获得最佳钢筋的建议 发展特点 该计划将包括一个基本的 钢-混凝土界面相互作用的研究 非线性有限元分析，以评估不同的肋 几何形状，测试现有的模式和原型酒吧，设计和 生产新花纹钢筋，并进行评估 全尺寸的结构构件。 结构性考虑将 包括紧密分布的 钢筋、接头和直接头的性能 发展，循环载荷，疲劳和断裂，以及高 强度混凝土 此外，还研究了环氧涂层对 结合强度和改性环氧涂层，如 将考虑添加砂砾。